diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt
index 8d521e83..f875a117 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt
@@ -42,7 +42,7 @@ import pl.szczodrzynski.edziennik.data.db.migration.*
     ConfigEntry::class,
     LibrusLesson::class,
     Metadata::class
-], version = 77)
+], version = 76)
 @TypeConverters(
         ConverterTime::class,
         ConverterDate::class,
@@ -159,8 +159,7 @@ abstract class AppDb : RoomDatabase() {
                 Migration73(),
                 Migration74(),
                 Migration75(),
-                Migration76(),
-                Migration77()
+                Migration76()
         ).allowMainThreadQueries().build()
     }
 }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/migration/Migration77.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/migration/Migration77.kt
deleted file mode 100644
index ad2d28ea..00000000
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/migration/Migration77.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package pl.szczodrzynski.edziennik.data.db.migration
-
-import androidx.room.migration.Migration
-import androidx.sqlite.db.SupportSQLiteDatabase
-
-class Migration77 : Migration(76, 77) {
-    override fun migrate(database: SupportSQLiteDatabase) {
-        database.execSQL("DROP TABLE lessonRanges")
-        database.execSQL("""CREATE TABLE IF NOT EXISTS lessonRanges (
-                profileId INTEGER NOT NULL,
-                lessonRangeNumber INTEGER NOT NULL,
-                lessonRangeStart TEXT NOT NULL,
-                lessonRangeEnd TEXT NOT NULL,
-                PRIMARY KEY(profileId, lessonRangeNumber))""")
-    }
-}