diff --git a/app/src/main/assets/pl-changelog.html b/app/src/main/assets/pl-changelog.html
index dbb51c25..a8944f04 100644
--- a/app/src/main/assets/pl-changelog.html
+++ b/app/src/main/assets/pl-changelog.html
@@ -1,7 +1,8 @@
-<h3>Wersja 4.3, 2020-08-26</h3>
+<h3>Wersja 4.3.1, 2020-08-27</h3>
 <ul>
     <li>Dodana opcja automatycznej archiwizacji profilu na nowy rok szkolny.</li>
     <li>Poprawione problemy z synchronizacją oraz mieszaniem się danych.</li>
+    <li>Przywrócona synchronizacja w wakacje.</li>
 </ul>
 <br>
 <br>
diff --git a/app/src/main/cpp/szkolny-signing.cpp b/app/src/main/cpp/szkolny-signing.cpp
index e2a5a9c1..8e1f92dd 100644
--- a/app/src/main/cpp/szkolny-signing.cpp
+++ b/app/src/main/cpp/szkolny-signing.cpp
@@ -9,7 +9,7 @@
 
 /*secret password - removed for source code publication*/
 static toys AES_IV[16] = {
-	0x20, 0x98, 0x82, 0x66, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  };
+	0x24, 0x85, 0x31, 0x5b, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  };
 
 unsigned char *agony(unsigned int laugh, unsigned char *box, unsigned char *heat);
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
index 087b8ef8..877bc0c9 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
@@ -46,6 +46,6 @@ object Signing {
 
     /*fun provideKey(param1: String, param2: Long): ByteArray {*/
     fun pleaseStopRightNow(param1: String, param2: Long): ByteArray {
-        return "$param1.MTIzNDU2Nzg5MDQC7Eh97U===.$param2".sha256()
+        return "$param1.MTIzNDU2Nzg5MDiVEOFGvG===.$param2".sha256()
     }
 }
diff --git a/build.gradle b/build.gradle
index da3c5573..fb7bfd13 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,8 +5,8 @@ buildscript {
         kotlin_version = '1.3.61'
 
         release = [
-                versionName: "4.3",
-                versionCode: 4030099
+                versionName: "4.3.1",
+                versionCode: 4030199
         ]
 
         setup = [