diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27ed58ef8..5853586c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Delta Chat Changelog
 
+## v0.17.3
+2018-05-17
+
+* Fix appearing system messages appearing twice
+* Fix: Use all gossipped verifications in verified groups
+* Update Basque, Polish, Russian and Ukrainian translations
+
 ## v0.17.2
 2018-05-15
 
diff --git a/MessengerProj/build.gradle b/MessengerProj/build.gradle
index f7d7f73c6..3a0c0c47d 100644
--- a/MessengerProj/build.gradle
+++ b/MessengerProj/build.gradle
@@ -124,7 +124,7 @@ android {
         targetSdkVersion 25  // 25: Nougat. CAVE: Do NOT target "Andoid O" without checking the background tasks carefully, see https://developer.android.com/preview/behavior-changes.html#back-all . As long as we target "Nougat", everything works as expected even for "Andoid O" or later
                              // in general, we should not change the target without reason; eg. after the switch to Nougat, the camera stops working (see https://inthecheesefactory.com/blog/how-to-share-access-to-file-with-fileprovider-on-android-nougat/en )
 
-        versionName "0.17.2" // do NOT forget to increase defaultConfig.versionCode!
-        versionCode 519
+        versionName "0.17.3" // do NOT forget to increase defaultConfig.versionCode!
+        versionCode 520
     }
 }