diff --git a/app/k9mail/build.gradle b/app/k9mail/build.gradle
index adb0ca636..f6664cedf 100644
--- a/app/k9mail/build.gradle
+++ b/app/k9mail/build.gradle
@@ -51,8 +51,8 @@ android {
         applicationId "com.fsck.k9"
         testApplicationId "com.fsck.k9.tests"
 
-        versionCode 34000
-        versionName '6.400'
+        versionCode 35000
+        versionName '6.500-SNAPSHOT'
 
         // Keep in sync with the resource string array 'supported_languages'
         resConfigs "in", "br", "ca", "cs", "cy", "da", "de", "et", "en", "en_GB", "es", "eo", "eu", "fr", "gd", "gl",