diff --git a/metadata/de.dennisguse.opentracks.playstore.yml b/metadata/de.dennisguse.opentracks.playstore.yml
index 724a303afc..009b26e349 100644
--- a/metadata/de.dennisguse.opentracks.playstore.yml
+++ b/metadata/de.dennisguse.opentracks.playstore.yml
@@ -149,9 +149,20 @@ Builds:
     gradle:
       - reproducible
 
+  - versionName: v4.21.0
+    versionCode: 6233
+    commit: 3c52a5b38a3bad6ae8990b5170217165fc2dec03
+    sudo:
+      - export CPUS_MAX=4
+      - export CPUS=$(getconf _NPROCESSORS_ONLN)
+      - for (( c=$CPUS_MAX; c<$CPUS; c++ )) ; do echo 0 > /sys/devices/system/cpu/cpu$c/online
+        ; done
+    gradle:
+      - reproducible
+
 AllowedAPKSigningKeys: 872c784563773b3d769ec34ceac4e38f1a2f15ef8ed44a61214c6d9d11c88a9b
 
 AutoUpdateMode: Version
 UpdateCheckMode: Tags
-CurrentVersion: v4.20.0
-CurrentVersionCode: 6217
+CurrentVersion: v4.21.0
+CurrentVersionCode: 6233