diff --git a/api/build.gradle b/api/build.gradle
index f247baf10..1f7cf1979 100644
--- a/api/build.gradle
+++ b/api/build.gradle
@@ -32,6 +32,7 @@ dependencies {
     implementation "org.jsoup:jsoup:$jsoup"
     implementation "org.apache.commons:commons-lang3:$apacheLang"
     implementation "com.google.code.gson:gson:$gson"
+    implementation "org.slf4j:slf4j-api:$slf4jApi"
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 
diff --git a/api/src/main/java/io/github/wulkanowy/api/Client.java b/api/src/main/java/io/github/wulkanowy/api/Client.java
index 277b80393..869ed65e3 100644
--- a/api/src/main/java/io/github/wulkanowy/api/Client.java
+++ b/api/src/main/java/io/github/wulkanowy/api/Client.java
@@ -3,6 +3,8 @@ package io.github.wulkanowy.api;
 import org.jsoup.Connection;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.util.Date;
@@ -27,6 +29,8 @@ public class Client {
 
     private Cookies cookies = new Cookies();
 
+    private static final Logger logger = LoggerFactory.getLogger(Client.class);
+
     Client(String email, String password, String symbol) {
         this.email = email;
         this.password = password;
@@ -59,9 +63,13 @@ public class Client {
         }
 
         this.symbol = new Login(this).login(email, password, symbol);
+        logger.info("Login successful on {} at {}", getHost(), new Date());
     }
 
     private boolean isLoggedIn() {
+        logger.debug("Last success request: {}", lastSuccessRequest);
+        logger.debug("Cookies: {}", getCookies().size());
+
         return getCookies().size() > 0 && lastSuccessRequest != null &&
                 5 > TimeUnit.MILLISECONDS.toMinutes(new Date().getTime() - lastSuccessRequest.getTime());
 
@@ -75,10 +83,6 @@ public class Client {
         this.symbol = symbol;
     }
 
-    public void addCookies(Map<String, String> items) {
-        cookies.addItems(items);
-    }
-
     private Map<String, String> getCookies() {
         return cookies.getItems();
     }
@@ -111,7 +115,11 @@ public class Client {
             this.cookies.addItems(cookies);
         }
 
-        Connection.Response response = Jsoup.connect(getFilledUrl(url))
+        url = getFilledUrl(url);
+
+        logger.debug("GET {}", url);
+
+        Connection.Response response = Jsoup.connect(url)
                 .followRedirects(true)
                 .cookies(getCookies())
                 .execute();
@@ -128,7 +136,11 @@ public class Client {
     }
 
     public synchronized Document postPageByUrl(String url, String[][] params) throws IOException, VulcanException {
-        Connection connection = Jsoup.connect(getFilledUrl(url));
+        url = getFilledUrl(url);
+
+        logger.debug("POST {}", url);
+
+        Connection connection = Jsoup.connect(url);
 
         for (String[] data : params) {
             connection.data(data[0], data[1]);
@@ -150,7 +162,11 @@ public class Client {
     public String getJsonStringByUrl(String url) throws IOException, VulcanException {
         login();
 
-        Connection.Response response = Jsoup.connect(getFilledUrl(url))
+        url = getFilledUrl(url);
+
+        logger.debug("GET {}", url);
+
+        Connection.Response response = Jsoup.connect(url)
                 .followRedirects(true)
                 .ignoreContentType(true)
                 .cookies(getCookies())
@@ -164,7 +180,11 @@ public class Client {
     public String postJsonStringByUrl(String url, String[][] params) throws IOException, VulcanException {
         login();
 
-        Connection connection = Jsoup.connect(getFilledUrl(url));
+        url = getFilledUrl(url);
+
+        logger.debug("POST {}", url);
+
+        Connection connection = Jsoup.connect(url);
 
         for (String[] data : params) {
             connection.data(data[0], data[1]);
@@ -196,7 +216,7 @@ public class Client {
         }
 
         if ("Błąd strony".equals(title)) {
-            throw new NotLoggedInErrorException(title + " " + doc.selectFirst("p, body") + ", status: " + code);
+            throw new NotLoggedInErrorException(title + " " + doc.selectFirst("body") + ", status: " + code);
         }
 
         return doc;
diff --git a/api/src/main/java/io/github/wulkanowy/api/DateTimeUtils.kt b/api/src/main/java/io/github/wulkanowy/api/DateTimeUtils.kt
index bad4e97df..3b620db50 100644
--- a/api/src/main/java/io/github/wulkanowy/api/DateTimeUtils.kt
+++ b/api/src/main/java/io/github/wulkanowy/api/DateTimeUtils.kt
@@ -14,9 +14,13 @@ fun getFormattedDate(date: String): String {
 }
 
 fun getFormattedDate(date: String, format: String): String {
-    val sdf = SimpleDateFormat(LOG_DATE_PATTERN, Locale.ROOT)
+    return getFormattedDate(date, LOG_DATE_PATTERN, format)
+}
+
+fun getFormattedDate(date: String, fromFormat: String, toFormat: String): String {
+    val sdf = SimpleDateFormat(fromFormat, Locale.ROOT)
     val d = sdf.parse(date)
-    sdf.applyPattern(format)
+    sdf.applyPattern(toFormat)
 
     return sdf.format(d)
 }
diff --git a/api/src/main/java/io/github/wulkanowy/api/StudentAndParent.java b/api/src/main/java/io/github/wulkanowy/api/StudentAndParent.java
index a4b8fefa0..03a7b0e55 100644
--- a/api/src/main/java/io/github/wulkanowy/api/StudentAndParent.java
+++ b/api/src/main/java/io/github/wulkanowy/api/StudentAndParent.java
@@ -3,6 +3,8 @@ package io.github.wulkanowy.api;
 import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Element;
 import org.jsoup.select.Elements;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.net.URL;
@@ -32,6 +34,8 @@ public class StudentAndParent implements SnP {
 
     private String diaryID;
 
+    private static final Logger logger = LoggerFactory.getLogger(StudentAndParent.class);
+
     StudentAndParent(Client client, String schoolID, String studentID, String diaryID) {
         this.client = client;
         this.schoolID = schoolID;
@@ -43,6 +47,11 @@ public class StudentAndParent implements SnP {
         if (null == getStudentID() || "".equals(getStudentID())) {
             Document doc = client.getPageByUrl(getSnpHomePageUrl());
 
+            if (doc.select("#idSection").isEmpty()) {
+                logger.error("Expected SnP page, got page with title: {} {}", doc.title(), doc.selectFirst("body"));
+                throw new VulcanException("Nieznany błąd podczas pobierania danych. Strona: " + doc.title());
+            }
+
             Student student = getCurrent(getStudents(doc));
             studentID = student.getId();
 
@@ -72,24 +81,27 @@ public class StudentAndParent implements SnP {
 
         // get url to uonetplus-opiekun.fakelog.cf
         Document startPage = client.getPageByUrl(START_PAGE_URL);
-        Element studentTileLink = startPage.select(".panel.linkownia.pracownik.klient > a").first();
+        Elements studentTileLink = startPage.select(".panel.linkownia.pracownik.klient > a");
 
-        if (null == studentTileLink) {
+        logger.debug("studentTileLink: {}", studentTileLink.size());
+
+        if (studentTileLink.isEmpty()) {
             throw new VulcanException("Na pewno używasz konta z dostępem do Witryny ucznia i rodzica?");
         }
 
-        String snpPageUrl = studentTileLink.attr("href");
+        String snpPageUrl = studentTileLink.last().attr("href");
 
         this.schoolID = getExtractedIdFromUrl(snpPageUrl);
 
         return snpPageUrl;
     }
 
-    String getExtractedIdFromUrl(String snpPageUrl) throws NotLoggedInErrorException {
+    String getExtractedIdFromUrl(String snpPageUrl) throws VulcanException {
         String[] path = snpPageUrl.split(client.getHost())[1].split("/");
 
         if (5 != path.length) {
-            throw new NotLoggedInErrorException("You are probably not logged in " + snpPageUrl);
+            logger.error("Expected snp url, got {}", snpPageUrl);
+            throw new VulcanException("Na pewno używasz konta z dostępem do Witryny ucznia i rodzica?");
         }
 
         return path[2];
@@ -107,12 +119,12 @@ public class StudentAndParent implements SnP {
         Map<String, String> cookies = new HashMap<>();
         cookies.put("idBiezacyDziennik", diaryID);
         cookies.put("idBiezacyUczen", studentID);
-        client.addCookies(cookies);
 
         Document doc = client.getPageByUrl(getBaseUrl() + url, true, cookies);
 
         if (!doc.title().startsWith("Witryna ucznia i rodzica")) {
-            throw new VulcanException("Expected SnP page, got page with title: " + doc.title());
+            logger.error("Expected SnP page, got page with title: {} {}", doc.title(), doc.selectFirst("body"));
+            throw new VulcanException("Nieznany błąd podczas pobierania danych. Strona: " + doc.title());
         }
 
         if (doc.title().endsWith("Strona główna")) {
diff --git a/api/src/main/java/io/github/wulkanowy/api/Vulcan.java b/api/src/main/java/io/github/wulkanowy/api/Vulcan.java
index c8c4d2b0e..2b4d1205c 100644
--- a/api/src/main/java/io/github/wulkanowy/api/Vulcan.java
+++ b/api/src/main/java/io/github/wulkanowy/api/Vulcan.java
@@ -1,5 +1,8 @@
 package io.github.wulkanowy.api;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.IOException;
 
 import io.github.wulkanowy.api.attendance.AttendanceStatistics;
@@ -30,17 +33,21 @@ public class Vulcan {
 
     private String diaryId;
 
+    private static final Logger logger = LoggerFactory.getLogger(Vulcan.class);
+
     public void setCredentials(String email, String password, String symbol, String schoolId, String studentId, String diaryId) {
         this.schoolId = schoolId;
         this.studentId = studentId;
         this.diaryId = diaryId;
 
         client = new Client(email, password, symbol);
+
+        logger.debug("Client created with symbol " + symbol);
     }
 
     public Client getClient() throws NotLoggedInErrorException {
         if (null == client) {
-            throw new NotLoggedInErrorException("Use setCredentials() method first");
+            throw new NotLoggedInErrorException("Vulcan must be initialized by calling setCredentials() prior to fetch data");
         }
 
         return client;
diff --git a/api/src/main/java/io/github/wulkanowy/api/mobile/RegisteredDevices.kt b/api/src/main/java/io/github/wulkanowy/api/mobile/RegisteredDevices.kt
index cd08a5858..d622b4de3 100644
--- a/api/src/main/java/io/github/wulkanowy/api/mobile/RegisteredDevices.kt
+++ b/api/src/main/java/io/github/wulkanowy/api/mobile/RegisteredDevices.kt
@@ -1,8 +1,7 @@
 package io.github.wulkanowy.api.mobile
 
 import io.github.wulkanowy.api.SnP
-import java.text.SimpleDateFormat
-import java.util.*
+import io.github.wulkanowy.api.getFormattedDate
 
 class RegisteredDevices(private val snp: SnP) {
 
@@ -28,7 +27,7 @@ class RegisteredDevices(private val snp: SnP) {
             devices.add(Device(
                     cells[0].text().replace(" ($system)", ""),
                     system,
-                    formatDate(cells[1].text()),
+                    getFormattedDate(cells[1].text(), "dd.MM.yyyy 'godz:' HH:mm:ss", "yyyy-MM-dd HH:mm:ss"),
                     cells[2].select("a").attr("href")
                             .split("/").last().toInt()
             ))
@@ -36,13 +35,4 @@ class RegisteredDevices(private val snp: SnP) {
 
         return devices
     }
-
-    // TODO: Move to date utils
-    private fun formatDate(date: String): String {
-        val sdf = SimpleDateFormat("dd.MM.yyyy 'godz:' HH:mm:ss", Locale.ROOT)
-        val d = sdf.parse(date)
-        sdf.applyPattern("yyyy-MM-dd HH:mm:ss")
-
-        return sdf.format(d)
-    }
 }
diff --git a/api/src/test/java/io/github/wulkanowy/api/StudentAndParentTest.java b/api/src/test/java/io/github/wulkanowy/api/StudentAndParentTest.java
index 1b6f7a91b..ba0c8f7fb 100644
--- a/api/src/test/java/io/github/wulkanowy/api/StudentAndParentTest.java
+++ b/api/src/test/java/io/github/wulkanowy/api/StudentAndParentTest.java
@@ -83,7 +83,7 @@ public class StudentAndParentTest {
                 snp.getExtractedIdFromUrl("https://uonetplus-opiekun.vulcan.net.pl/demoupowiat/demo12345/Start/Index/"));
     }
 
-    @Test(expected = NotLoggedInErrorException.class)
+    @Test(expected = VulcanException.class)
     public void getExtractedIDNotLoggedTest() throws Exception {
         Mockito.when(client.getHost()).thenReturn("vulcan.net.pl");
         StudentAndParent snp = new StudentAndParent(client, "symbol", null, null);
@@ -131,8 +131,8 @@ public class StudentAndParentTest {
 
     @Test
     public void getDiariesAndStudentTest() throws IOException, VulcanException {
-        Document snpHome = Jsoup.parse(FixtureHelper.getAsString(
-                getClass().getResourceAsStream("StudentAndParent.html")));
+        String input = FixtureHelper.getAsString(getClass().getResourceAsStream("WitrynaUczniaIRodzica.html"));
+        Document snpHome = Jsoup.parse(input);
 
         client = Mockito.mock(Client.class);
         Mockito.when(client.getPageByUrl(Mockito.anyString())).thenReturn(snpHome);
diff --git a/api/src/test/resources/io/github/wulkanowy/api/StudentAndParent.html b/api/src/test/resources/io/github/wulkanowy/api/WitrynaUczniaIRodzica.html
similarity index 100%
rename from api/src/test/resources/io/github/wulkanowy/api/StudentAndParent.html
rename to api/src/test/resources/io/github/wulkanowy/api/WitrynaUczniaIRodzica.html
diff --git a/app/build.gradle b/app/build.gradle
index 50677a7ae..aefebcfbe 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -118,6 +118,9 @@ dependencies {
     implementation "com.jakewharton.threetenabp:threetenabp:$threeTenABP"
     implementation "com.google.android.gms:play-services-oss-licenses:$ossLicenses"
 
+    implementation "com.jakewharton.timber:timber:$timber"
+    implementation "at.favre.lib:slf4j-timber:$slf4jTimber"
+
     implementation("com.crashlytics.sdk.android:crashlytics:$crashlyticsSdk@aar") {
         transitive = true
     }
diff --git a/app/src/main/java/io/github/wulkanowy/WulkanowyApp.java b/app/src/main/java/io/github/wulkanowy/WulkanowyApp.java
index 5b68abbf4..d3570512a 100644
--- a/app/src/main/java/io/github/wulkanowy/WulkanowyApp.java
+++ b/app/src/main/java/io/github/wulkanowy/WulkanowyApp.java
@@ -12,11 +12,12 @@ import javax.inject.Inject;
 import dagger.android.AndroidInjector;
 import dagger.android.support.DaggerApplication;
 import eu.davidea.flexibleadapter.FlexibleAdapter;
-import eu.davidea.flexibleadapter.utils.Log;
 import io.fabric.sdk.android.Fabric;
 import io.github.wulkanowy.data.RepositoryContract;
 import io.github.wulkanowy.di.DaggerAppComponent;
-import io.github.wulkanowy.utils.LogUtils;
+import io.github.wulkanowy.utils.FabricUtils;
+import io.github.wulkanowy.utils.LoggerUtils;
+import timber.log.Timber;
 
 public class WulkanowyApp extends DaggerApplication {
 
@@ -39,15 +40,18 @@ public class WulkanowyApp extends DaggerApplication {
         if (repository.getSharedRepo().isUserLoggedIn()) {
             try {
                 repository.getSyncRepo().initLastUser();
+                FabricUtils.logLogin("Open app", true);
             } catch (Exception e) {
-                LogUtils.error("An error occurred when the application was started", e);
+                FabricUtils.logLogin("Open app", false);
+                Timber.e(e, "An error occurred when the application was started");
             }
         }
     }
 
     private void enableDebugLog() {
         QueryBuilder.LOG_VALUES = true;
-        FlexibleAdapter.enableLogs(Log.Level.DEBUG);
+        FlexibleAdapter.enableLogs(eu.davidea.flexibleadapter.utils.Log.Level.DEBUG);
+        Timber.plant(new LoggerUtils.DebugLogTree());
     }
 
     private void initializeFabric() {
@@ -60,6 +64,7 @@ public class WulkanowyApp extends DaggerApplication {
                 )
                 .debuggable(BuildConfig.DEBUG)
                 .build());
+        Timber.plant(new LoggerUtils.CrashlyticsTree());
     }
 
     @Override
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/dao/DbHelper.java b/app/src/main/java/io/github/wulkanowy/data/db/dao/DbHelper.java
index 7ffcfe279..904fa3433 100644
--- a/app/src/main/java/io/github/wulkanowy/data/db/dao/DbHelper.java
+++ b/app/src/main/java/io/github/wulkanowy/data/db/dao/DbHelper.java
@@ -22,7 +22,7 @@ import io.github.wulkanowy.data.db.dao.migrations.Migration26;
 import io.github.wulkanowy.data.db.dao.migrations.Migration27;
 import io.github.wulkanowy.data.db.dao.migrations.Migration28;
 import io.github.wulkanowy.data.db.shared.SharedPrefContract;
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 @Singleton
 public class DbHelper extends DaoMaster.OpenHelper {
@@ -41,7 +41,7 @@ public class DbHelper extends DaoMaster.OpenHelper {
 
     @Override
     public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-        LogUtils.info("Cleaning user data oldVersion=" + oldVersion + " newVersion=" + newVersion);
+        Timber.i("Cleaning user data oldVersion=%s newVersion=%s", oldVersion, newVersion);
         Database database = new StandardDatabase(db);
         recreateDatabase(database);
     }
@@ -54,11 +54,11 @@ public class DbHelper extends DaoMaster.OpenHelper {
         for (Migration migration : migrations) {
             if (oldVersion < migration.getVersion()) {
                 try {
-                    LogUtils.info("Applying migration to db schema v" + migration.getVersion() + "...");
+                    Timber.i("Applying migration to db schema v%s...", migration.getVersion());
                     migration.runMigration(db, sharedPref, vulcan);
-                    LogUtils.info("Migration " + migration.getVersion() + " complete");
+                    Timber.i("Migration %s complete", migration.getVersion());
                 } catch (Exception e) {
-                    e.printStackTrace();
+                    Timber.e(e, "Failed to apply migration");
                     recreateDatabase(db);
                     break;
                 }
@@ -67,7 +67,7 @@ public class DbHelper extends DaoMaster.OpenHelper {
     }
 
     private void recreateDatabase(Database db) {
-        LogUtils.info("Database is recreating...");
+        Timber.i("Database is recreating...");
         sharedPref.setCurrentUserId(0);
         DaoMaster.dropAllTables(db, true);
         onCreate(db);
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/dao/migrations/Migration23.java b/app/src/main/java/io/github/wulkanowy/data/db/dao/migrations/Migration23.java
index 97b575a02..b2a41ad15 100644
--- a/app/src/main/java/io/github/wulkanowy/data/db/dao/migrations/Migration23.java
+++ b/app/src/main/java/io/github/wulkanowy/data/db/dao/migrations/Migration23.java
@@ -9,8 +9,8 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import io.github.wulkanowy.api.generic.Diary;
 import io.github.wulkanowy.api.Vulcan;
+import io.github.wulkanowy.api.generic.Diary;
 import io.github.wulkanowy.data.db.dao.DbHelper;
 import io.github.wulkanowy.data.db.shared.SharedPrefContract;
 import io.github.wulkanowy.utils.security.Scrambler;
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/resources/ResourcesRepository.java b/app/src/main/java/io/github/wulkanowy/data/db/resources/ResourcesRepository.java
index 81aeaee2b..f8a1baaa2 100644
--- a/app/src/main/java/io/github/wulkanowy/data/db/resources/ResourcesRepository.java
+++ b/app/src/main/java/io/github/wulkanowy/data/db/resources/ResourcesRepository.java
@@ -3,8 +3,6 @@ package io.github.wulkanowy.data.db.resources;
 import android.content.Context;
 import android.content.res.Resources;
 
-import com.crashlytics.android.Crashlytics;
-
 import java.io.IOException;
 import java.net.SocketTimeoutException;
 import java.net.UnknownHostException;
@@ -16,8 +14,8 @@ import io.github.wulkanowy.R;
 import io.github.wulkanowy.api.NotLoggedInErrorException;
 import io.github.wulkanowy.data.db.dao.entities.AttendanceLesson;
 import io.github.wulkanowy.utils.AppConstant;
-import io.github.wulkanowy.utils.LogUtils;
 import io.github.wulkanowy.utils.security.CryptoException;
+import timber.log.Timber;
 
 @Singleton
 public class ResourcesRepository implements ResourcesContract {
@@ -41,8 +39,7 @@ public class ResourcesRepository implements ResourcesContract {
 
     @Override
     public String getErrorLoginMessage(Exception exception) {
-        LogUtils.error(AppConstant.APP_NAME + " encountered a error", exception);
-        Crashlytics.logException(exception);
+        Timber.e(exception,"%s encountered a error", AppConstant.APP_NAME);
 
         if (exception instanceof CryptoException) {
             return resources.getString(R.string.encrypt_failed_text);
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java
index 032e95e4e..b9f72cb2d 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java
@@ -24,9 +24,9 @@ import io.github.wulkanowy.data.db.dao.entities.Symbol;
 import io.github.wulkanowy.data.db.dao.entities.SymbolDao;
 import io.github.wulkanowy.data.db.shared.SharedPrefContract;
 import io.github.wulkanowy.utils.DataObjectConverter;
-import io.github.wulkanowy.utils.LogUtils;
 import io.github.wulkanowy.utils.security.CryptoException;
 import io.github.wulkanowy.utils.security.Scrambler;
+import timber.log.Timber;
 
 @Singleton
 public class AccountSync {
@@ -73,7 +73,7 @@ public class AccountSync {
     }
 
     private Account insertAccount(String email, String password) throws CryptoException {
-        LogUtils.debug("Register account: " + email);
+        Timber.d("Register account");
         Account account = new Account()
                 .setEmail(email)
                 .setPassword(Scrambler.encrypt(email, password, context));
@@ -82,10 +82,11 @@ public class AccountSync {
     }
 
     private Symbol insertSymbol(Account account) throws VulcanException, IOException {
-        LogUtils.debug("Register symbol: " + vulcan.getSymbol());
+        String schoolId = vulcan.getStudentAndParent().getSchoolID();
+        Timber.d("Register symbol %s", vulcan.getSymbol());
         Symbol symbol = new Symbol()
                 .setUserId(account.getId())
-                .setSchoolId(vulcan.getStudentAndParent().getSchoolID())
+                .setSchoolId(schoolId)
                 .setSymbol(vulcan.getSymbol());
         daoSession.getSymbolDao().insert(symbol);
 
@@ -97,7 +98,7 @@ public class AccountSync {
                 vulcan.getStudentAndParent().getStudents(),
                 symbol.getId()
         );
-        LogUtils.debug("Register students: " + studentList.size());
+        Timber.d("Register students %s", studentList.size());
         daoSession.getStudentDao().insertInTx(studentList);
     }
 
@@ -108,7 +109,7 @@ public class AccountSync {
                         StudentDao.Properties.SymbolId.eq(symbolEntity.getId()),
                         StudentDao.Properties.Current.eq(true)
                 ).unique().getId());
-        LogUtils.debug("Register diaries: " + diaryList.size());
+        Timber.d("Register diaries %s", diaryList.size());
         daoSession.getDiaryDao().insertInTx(diaryList);
     }
 
@@ -118,7 +119,7 @@ public class AccountSync {
                 daoSession.getDiaryDao().queryBuilder().where(
                         DiaryDao.Properties.Current.eq(true)
                 ).unique().getId());
-        LogUtils.debug("Register semesters: " + semesterList.size());
+        Timber.d("Register semesters %s", semesterList.size());
         daoSession.getSemesterDao().insertInTx(semesterList);
     }
 
@@ -130,7 +131,7 @@ public class AccountSync {
             throw new NotRegisteredUserException("Can't find user id in SharedPreferences");
         }
 
-        LogUtils.debug("Initialization current user id=" + userId);
+        Timber.d("Init current user (%s)", userId);
 
         Account account = daoSession.getAccountDao().load(userId);
 
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/AttendanceSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/AttendanceSync.java
index 9f379be60..187694189 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/AttendanceSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/AttendanceSync.java
@@ -18,7 +18,7 @@ import io.github.wulkanowy.data.db.dao.entities.DayDao;
 import io.github.wulkanowy.data.db.dao.entities.Week;
 import io.github.wulkanowy.data.db.dao.entities.WeekDao;
 import io.github.wulkanowy.utils.DataObjectConverter;
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 @Singleton
 public class AttendanceSync {
@@ -47,7 +47,7 @@ public class AttendanceSync {
 
         daoSession.getAttendanceLessonDao().saveInTx(lessonList);
 
-        LogUtils.debug("Synchronization attendance lessons (amount = " + lessonList.size() + ")");
+        Timber.d("Attendance synchronization complete (%s)", lessonList.size());
     }
 
     private io.github.wulkanowy.api.generic.Week<io.github.wulkanowy.api.generic.Day> getWeekFromApi(String date)
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/ExamsSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/ExamsSync.java
index 85b4dac40..db4730921 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/ExamsSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/ExamsSync.java
@@ -17,7 +17,7 @@ import io.github.wulkanowy.data.db.dao.entities.ExamDao;
 import io.github.wulkanowy.data.db.dao.entities.Week;
 import io.github.wulkanowy.data.db.dao.entities.WeekDao;
 import io.github.wulkanowy.utils.DataObjectConverter;
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 public class ExamsSync {
 
@@ -45,7 +45,7 @@ public class ExamsSync {
 
         daoSession.getExamDao().saveInTx(examList);
 
-        LogUtils.debug("Synchronization exams (amount = " + examList.size() + ")");
+        Timber.d("Exams synchronization complete (%s)", examList.size());
     }
 
     private Week getWeekFromDb(String date) {
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/GradeSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/GradeSync.java
index 0b70695de..59a71845c 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/GradeSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/GradeSync.java
@@ -1,7 +1,6 @@
 package io.github.wulkanowy.data.sync;
 
 import java.io.IOException;
-import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -16,7 +15,7 @@ import io.github.wulkanowy.data.db.dao.entities.Semester;
 import io.github.wulkanowy.data.db.dao.entities.SubjectDao;
 import io.github.wulkanowy.utils.DataObjectConverter;
 import io.github.wulkanowy.utils.EntitiesCompare;
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 @Singleton
 public class GradeSync {
@@ -33,7 +32,7 @@ public class GradeSync {
         this.vulcan = vulcan;
     }
 
-    public void sync(long semesterId) throws IOException, VulcanException, ParseException {
+    public void sync(long semesterId) throws IOException, VulcanException {
         this.semesterId = semesterId;
 
         Semester semester = daoSession.getSemesterDao().load(semesterId);
@@ -44,7 +43,7 @@ public class GradeSync {
         daoSession.getGradeDao().deleteInTx(semester.getGradeList());
         daoSession.getGradeDao().insertInTx(lastList);
 
-        LogUtils.debug("Synchronization grades (amount = " + lastList.size() + ")");
+        Timber.d("Grades synchronization complete (%s)", lastList.size());
     }
 
     private void resetSemesterRelations(Semester semester) {
@@ -64,7 +63,7 @@ public class GradeSync {
         return updatedList;
     }
 
-    private List<Grade> getComparedList(Semester semester) throws IOException, VulcanException, ParseException {
+    private List<Grade> getComparedList(Semester semester) throws IOException, VulcanException {
         List<Grade> gradesFromNet = DataObjectConverter.gradesToGradeEntities(
                 vulcan.getGradesList().getAll(semester.getValue()), semesterId);
 
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/SubjectSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/SubjectSync.java
index 163a62340..1d0300d69 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/SubjectSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/SubjectSync.java
@@ -13,7 +13,7 @@ import io.github.wulkanowy.data.db.dao.entities.DaoSession;
 import io.github.wulkanowy.data.db.dao.entities.Semester;
 import io.github.wulkanowy.data.db.dao.entities.Subject;
 import io.github.wulkanowy.utils.DataObjectConverter;
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 @Singleton
 public class SubjectSync {
@@ -40,7 +40,7 @@ public class SubjectSync {
         daoSession.getSubjectDao().deleteInTx(getSubjectsFromDb());
         daoSession.getSubjectDao().insertInTx(lastList);
 
-        LogUtils.debug("Synchronization subjects (amount = " + lastList.size() + ")");
+        Timber.d("Subjects synchronization complete (%s)", lastList.size());
     }
 
     private List<Subject> getSubjectsFromNet(Semester semester) throws VulcanException, IOException {
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/SyncRepository.java b/app/src/main/java/io/github/wulkanowy/data/sync/SyncRepository.java
index 6a1e4dc1f..05dd14fdb 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/SyncRepository.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/SyncRepository.java
@@ -1,7 +1,6 @@
 package io.github.wulkanowy.data.sync;
 
 import java.io.IOException;
-import java.text.ParseException;
 
 import javax.inject.Inject;
 import javax.inject.Singleton;
@@ -47,17 +46,17 @@ public class SyncRepository implements SyncContract {
     }
 
     @Override
-    public void initLastUser() throws IOException, CryptoException {
+    public void initLastUser() throws CryptoException {
         accountSync.initLastUser();
     }
 
     @Override
-    public void syncGrades(int semesterName) throws VulcanException, IOException, ParseException {
+    public void syncGrades(int semesterName) throws VulcanException, IOException {
         gradeSync.sync(semesterName);
     }
 
     @Override
-    public void syncGrades() throws VulcanException, IOException, ParseException {
+    public void syncGrades() throws VulcanException, IOException {
         gradeSync.sync(database.getCurrentSemesterId());
     }
 
@@ -72,12 +71,12 @@ public class SyncRepository implements SyncContract {
     }
 
     @Override
-    public void syncAttendance() throws ParseException, IOException, VulcanException {
+    public void syncAttendance() throws IOException, VulcanException {
         attendanceSync.syncAttendance(database.getCurrentDiaryId(), null);
     }
 
     @Override
-    public void syncAttendance(long diaryId, String date) throws ParseException, IOException, VulcanException {
+    public void syncAttendance(long diaryId, String date) throws IOException, VulcanException {
         if (diaryId != 0) {
             attendanceSync.syncAttendance(diaryId, date);
         } else {
@@ -86,12 +85,12 @@ public class SyncRepository implements SyncContract {
     }
 
     @Override
-    public void syncTimetable() throws VulcanException, IOException, ParseException {
+    public void syncTimetable() throws VulcanException, IOException {
         timetableSync.syncTimetable(database.getCurrentDiaryId(), null);
     }
 
     @Override
-    public void syncTimetable(long diaryId, String date) throws VulcanException, IOException, ParseException {
+    public void syncTimetable(long diaryId, String date) throws VulcanException, IOException {
         if (diaryId != 0) {
             timetableSync.syncTimetable(diaryId, date);
         } else {
@@ -100,12 +99,12 @@ public class SyncRepository implements SyncContract {
     }
 
     @Override
-    public void syncExams() throws VulcanException, IOException, ParseException {
+    public void syncExams() throws VulcanException, IOException {
         examsSync.syncExams(database.getCurrentDiaryId(), null);
     }
 
     @Override
-    public void syncExams(long diaryId, String date) throws VulcanException, IOException, ParseException {
+    public void syncExams(long diaryId, String date) throws VulcanException, IOException {
         if (diaryId != 0) {
             examsSync.syncExams(diaryId, date);
         } else {
@@ -114,7 +113,7 @@ public class SyncRepository implements SyncContract {
     }
 
     @Override
-    public void syncAll() throws VulcanException, IOException, ParseException {
+    public void syncAll() throws VulcanException, IOException {
         syncSubjects();
         syncGrades();
         syncAttendance();
diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/TimetableSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/TimetableSync.java
index 309403c88..1ea2fa488 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/TimetableSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/TimetableSync.java
@@ -20,7 +20,7 @@ import io.github.wulkanowy.data.db.dao.entities.TimetableLessonDao;
 import io.github.wulkanowy.data.db.dao.entities.Week;
 import io.github.wulkanowy.data.db.dao.entities.WeekDao;
 import io.github.wulkanowy.utils.DataObjectConverter;
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 @Singleton
 public class TimetableSync {
@@ -49,7 +49,7 @@ public class TimetableSync {
 
         daoSession.getTimetableLessonDao().saveInTx(lessonList);
 
-        LogUtils.debug("Synchronization timetable lessons (amount = " + lessonList.size() + ")");
+        Timber.d("Timetable synchronization complete (%s)", lessonList.size());
     }
 
     private io.github.wulkanowy.api.generic.Week<io.github.wulkanowy.api.timetable.TimetableDay> getWeekFromApi(String date)
diff --git a/app/src/main/java/io/github/wulkanowy/services/jobs/SyncJob.java b/app/src/main/java/io/github/wulkanowy/services/jobs/SyncJob.java
index 432bdc23a..b21363910 100644
--- a/app/src/main/java/io/github/wulkanowy/services/jobs/SyncJob.java
+++ b/app/src/main/java/io/github/wulkanowy/services/jobs/SyncJob.java
@@ -4,7 +4,6 @@ import android.app.PendingIntent;
 import android.content.Context;
 import android.support.v4.app.NotificationCompat;
 
-import com.crashlytics.android.Crashlytics;
 import com.firebase.jobdispatcher.Constraint;
 import com.firebase.jobdispatcher.FirebaseJobDispatcher;
 import com.firebase.jobdispatcher.GooglePlayDriver;
@@ -27,7 +26,8 @@ import io.github.wulkanowy.data.db.dao.entities.Grade;
 import io.github.wulkanowy.data.sync.NotRegisteredUserException;
 import io.github.wulkanowy.services.notifies.GradeNotify;
 import io.github.wulkanowy.ui.main.MainActivity;
-import io.github.wulkanowy.utils.LogUtils;
+import io.github.wulkanowy.utils.FabricUtils;
+import timber.log.Timber;
 
 public class SyncJob extends SimpleJobService {
 
@@ -74,13 +74,18 @@ public class SyncJob extends SimpleJobService {
             if (!gradeList.isEmpty() && repository.getSharedRepo().isNotifyEnable()) {
                 showNotification();
             }
+
+            FabricUtils.logLogin("Background", true);
+
             return JobService.RESULT_SUCCESS;
         } catch (NotRegisteredUserException e) {
             logError(e);
             stop(getApplicationContext());
+
             return JobService.RESULT_FAIL_NORETRY;
         } catch (Exception e) {
             logError(e);
+
             return JobService.RESULT_FAIL_RETRY;
         }
     }
@@ -122,7 +127,7 @@ public class SyncJob extends SimpleJobService {
     }
 
     private void logError(Exception e) {
-        Crashlytics.logException(e);
-        LogUtils.error("During background synchronization an error occurred", e);
+        FabricUtils.logLogin("Background", false);
+        Timber.e(e, "During background synchronization an error occurred");
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/login/LoginPresenter.java b/app/src/main/java/io/github/wulkanowy/ui/login/LoginPresenter.java
index fb63e6af2..3ae1ce9e7 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/login/LoginPresenter.java
+++ b/app/src/main/java/io/github/wulkanowy/ui/login/LoginPresenter.java
@@ -85,7 +85,7 @@ public class LoginPresenter extends BasePresenter<LoginContract.View>
     @Override
     public void onEndAsync(boolean success, Exception exception) {
         if (success) {
-            FabricUtils.logRegister(true, getRepository().getDbRepo().getCurrentSymbol().getSymbol());
+            FabricUtils.logRegister(true, getRepository().getDbRepo().getCurrentSymbol().getSymbol(), "Success");
             getView().openMainActivity();
             return;
         } else if (exception instanceof BadCredentialsException) {
@@ -95,7 +95,7 @@ public class LoginPresenter extends BasePresenter<LoginContract.View>
             getView().setErrorSymbolRequired();
             getView().showSoftInput();
         } else {
-            FabricUtils.logRegister(false, symbol);
+            FabricUtils.logRegister(false, symbol, exception.getMessage());
             getView().showMessage(getRepository().getResRepo().getErrorLoginMessage(exception));
         }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/main/exams/ExamsFragment.java b/app/src/main/java/io/github/wulkanowy/ui/main/exams/ExamsFragment.java
index 503257982..05557b81e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/main/exams/ExamsFragment.java
+++ b/app/src/main/java/io/github/wulkanowy/ui/main/exams/ExamsFragment.java
@@ -2,7 +2,6 @@ package io.github.wulkanowy.ui.main.exams;
 
 import android.os.Bundle;
 import android.support.annotation.NonNull;
-import android.support.design.widget.Snackbar;
 import android.support.design.widget.TabLayout;
 import android.support.v4.view.ViewPager;
 import android.view.LayoutInflater;
@@ -13,7 +12,6 @@ import javax.inject.Inject;
 import javax.inject.Named;
 
 import butterknife.BindView;
-import butterknife.ButterKnife;
 import io.github.wulkanowy.R;
 import io.github.wulkanowy.ui.base.BaseFragment;
 import io.github.wulkanowy.ui.base.BasePagerAdapter;
diff --git a/app/src/main/java/io/github/wulkanowy/ui/splash/SplashActivity.java b/app/src/main/java/io/github/wulkanowy/ui/splash/SplashActivity.java
index b90f396c5..5e4dfec1f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/splash/SplashActivity.java
+++ b/app/src/main/java/io/github/wulkanowy/ui/splash/SplashActivity.java
@@ -4,7 +4,6 @@ import android.os.Bundle;
 
 import javax.inject.Inject;
 
-import io.github.wulkanowy.services.jobs.SyncJob;
 import io.github.wulkanowy.services.notifies.NotificationService;
 import io.github.wulkanowy.ui.base.BaseActivity;
 import io.github.wulkanowy.ui.login.LoginActivity;
diff --git a/app/src/main/java/io/github/wulkanowy/utils/FabricUtils.java b/app/src/main/java/io/github/wulkanowy/utils/FabricUtils.java
index 38811534c..69897caa0 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/FabricUtils.java
+++ b/app/src/main/java/io/github/wulkanowy/utils/FabricUtils.java
@@ -2,6 +2,7 @@ package io.github.wulkanowy.utils;
 
 import com.crashlytics.android.answers.Answers;
 import com.crashlytics.android.answers.CustomEvent;
+import com.crashlytics.android.answers.LoginEvent;
 import com.crashlytics.android.answers.SignUpEvent;
 
 public final class FabricUtils {
@@ -10,17 +11,26 @@ public final class FabricUtils {
         throw new IllegalStateException("Utility class");
     }
 
-    public static void logRegister(boolean result, String symbol) {
+    public static void logLogin(String method, boolean result) {
+        Answers.getInstance().logLogin(new LoginEvent()
+                .putMethod(method)
+                .putSuccess(result)
+        );
+    }
+
+    public static void logRegister(boolean result, String symbol, String message) {
         Answers.getInstance().logSignUp(new SignUpEvent()
                 .putMethod("Login activity")
                 .putSuccess(result)
-                .putCustomAttribute("symbol", symbol));
+                .putCustomAttribute("symbol", symbol)
+                .putCustomAttribute("message", message)
+        );
     }
 
     public static void logRefresh(String name, boolean result, String date) {
         Answers.getInstance().logCustom(
                 new CustomEvent(name + " refresh")
-                        .putCustomAttribute("Success", result ? 1 : 0)
+                        .putCustomAttribute("Success", result ? "true" : "false")
                         .putCustomAttribute("Date", date)
         );
     }
diff --git a/app/src/main/java/io/github/wulkanowy/utils/LogUtils.java b/app/src/main/java/io/github/wulkanowy/utils/LogUtils.java
deleted file mode 100644
index f59bbf641..000000000
--- a/app/src/main/java/io/github/wulkanowy/utils/LogUtils.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package io.github.wulkanowy.utils;
-
-import android.util.Log;
-
-public final class LogUtils {
-
-    private LogUtils() {
-        throw new IllegalStateException("Utility class");
-    }
-
-    public static void debug(String message) {
-        Log.d(AppConstant.APP_NAME, message);
-    }
-
-    public static void error(String message, Throwable throwable) {
-        Log.e(AppConstant.APP_NAME, message, throwable);
-    }
-
-    public static void error(String message) {
-        Log.e(AppConstant.APP_NAME, message);
-    }
-
-    public static void info(String message) {
-        Log.i(AppConstant.APP_NAME, message);
-    }
-}
diff --git a/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.java b/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.java
new file mode 100644
index 000000000..6e6c701b1
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.java
@@ -0,0 +1,47 @@
+package io.github.wulkanowy.utils;
+
+import android.os.Build;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.util.Log;
+
+import com.crashlytics.android.Crashlytics;
+
+import timber.log.Timber;
+
+public final class LoggerUtils {
+
+    public static class CrashlyticsTree extends Timber.Tree {
+
+        @Override
+        protected void log(int priority, @Nullable String tag, @Nullable String message, @Nullable Throwable t) {
+            Crashlytics.setInt("priority", priority);
+            Crashlytics.setString("tag", tag);
+
+            if (t == null) {
+                Crashlytics.log(message);
+            } else {
+                Crashlytics.setString("message", message);
+                Crashlytics.logException(t);
+            }
+        }
+    }
+
+    public static class DebugLogTree extends Timber.DebugTree {
+
+        @Override
+        protected void log(int priority, String tag, @NonNull String message, Throwable t) {
+            if ("HUAWEI".equals(Build.MANUFACTURER) || "samsung".equals(Build.MANUFACTURER)) {
+                if (priority == Log.VERBOSE || priority == Log.DEBUG || priority == Log.INFO) {
+                    priority = Log.ERROR;
+                }
+            }
+            super.log(priority, AppConstant.APP_NAME, message, t);
+        }
+
+        @Override
+        protected String createStackElementTag(@NonNull StackTraceElement element) {
+            return super.createStackElementTag(element) + " - " + element.getLineNumber();
+        }
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/utils/async/AbstractTask.java b/app/src/main/java/io/github/wulkanowy/utils/async/AbstractTask.java
index 5106d6417..447214164 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/async/AbstractTask.java
+++ b/app/src/main/java/io/github/wulkanowy/utils/async/AbstractTask.java
@@ -2,7 +2,7 @@ package io.github.wulkanowy.utils.async;
 
 import android.os.AsyncTask;
 
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 public class AbstractTask extends AsyncTask<Void, Integer, Boolean> {
 
@@ -28,7 +28,7 @@ public class AbstractTask extends AsyncTask<Void, Integer, Boolean> {
             } else if (onRefreshListener != null) {
                 onRefreshListener.onDoInBackgroundRefresh();
             } else {
-                LogUtils.error("AbstractTask does not have a listener assigned");
+                Timber.e("AbstractTask does not have a listener assigned");
             }
             return true;
         } catch (Exception e) {
@@ -45,7 +45,7 @@ public class AbstractTask extends AsyncTask<Void, Integer, Boolean> {
         } else if (onRefreshListener != null) {
             onRefreshListener.onCanceledRefreshAsync();
         } else {
-            LogUtils.error("AbstractTask does not have a listener assigned");
+            Timber.e("AbstractTask does not have a listener assigned");
         }
     }
 
@@ -57,7 +57,7 @@ public class AbstractTask extends AsyncTask<Void, Integer, Boolean> {
         } else if (onRefreshListener != null) {
             onRefreshListener.onEndRefreshAsync(result, exception);
         } else {
-            LogUtils.error("AbstractTask does not have a listener assigned");
+            Timber.e("AbstractTask does not have a listener assigned");
         }
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/utils/security/Scrambler.java b/app/src/main/java/io/github/wulkanowy/utils/security/Scrambler.java
index dc0c409a4..8e425a894 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/security/Scrambler.java
+++ b/app/src/main/java/io/github/wulkanowy/utils/security/Scrambler.java
@@ -26,7 +26,7 @@ import javax.crypto.CipherInputStream;
 import javax.crypto.CipherOutputStream;
 import javax.security.auth.x500.X500Principal;
 
-import io.github.wulkanowy.utils.LogUtils;
+import timber.log.Timber;
 
 public final class Scrambler {
 
@@ -111,7 +111,7 @@ public final class Scrambler {
             throw new CryptoException("GenerateNewKey - String is empty");
         }
 
-        LogUtils.debug("Key pair are create");
+        Timber.d("Key pair are create");
 
     }
 
diff --git a/app/src/test/java/io/github/wulkanowy/data/db/dao/entities/GradeTest.java b/app/src/test/java/io/github/wulkanowy/data/db/dao/entities/GradeTest.java
index 580ffdf51..f47e75e22 100644
--- a/app/src/test/java/io/github/wulkanowy/data/db/dao/entities/GradeTest.java
+++ b/app/src/test/java/io/github/wulkanowy/data/db/dao/entities/GradeTest.java
@@ -3,8 +3,6 @@ package io.github.wulkanowy.data.db.dao.entities;
 import org.junit.Assert;
 import org.junit.Test;
 
-import io.github.wulkanowy.R;
-
 public class GradeTest {
 
     @Test
diff --git a/build.gradle b/build.gradle
index 0f9746575..6af8545e5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -50,6 +50,10 @@ ext {
     gson = "2.8.5"
     ossLicenses = "15.0.1"
 
+    slf4jApi = "1.7.25"
+    slf4jTimber = "1.0.1"
+    timber = "4.7.0"
+
     debugDb = "1.0.3"
     sqlcipher = "3.5.9"