diff --git a/stats/known_apks.txt b/stats/known_apks.txt
index 4361fb27c7..89efa8886b 100644
--- a/stats/known_apks.txt
+++ b/stats/known_apks.txt
@@ -193,6 +193,7 @@ at.bitfire.davdroid_17.apk at.bitfire.davdroid 2013-12-01
 at.bitfire.davdroid_18.apk at.bitfire.davdroid 2013-12-07
 at.bitfire.davdroid_19.apk at.bitfire.davdroid 2013-12-09
 at.bitfire.davdroid_20.apk at.bitfire.davdroid 2013-12-12
+at.bitfire.davdroid_21.apk at.bitfire.davdroid 2013-12-16
 at.bitfire.davdroid_5.apk at.bitfire.davdroid 2013-10-13
 at.bitfire.davdroid_6.apk at.bitfire.davdroid 2013-10-16
 at.bitfire.davdroid_7.apk at.bitfire.davdroid 2013-10-21