diff --git a/metadata/com.calcitem.sanmill.yml b/metadata/com.calcitem.sanmill.yml
index 50dfaedb8f..2afaa96453 100644
--- a/metadata/com.calcitem.sanmill.yml
+++ b/metadata/com.calcitem.sanmill.yml
@@ -441,6 +441,32 @@ Builds:
       - flutter config --no-analytics
       - flutter build apk -v --flavor fdroid
 
+  - versionName: 1.0.21
+    versionCode: 1901
+    commit: v1.0.21
+    output: src/ui/flutter_app/build/app/outputs/flutter-apk/app-fdroid-release.apk
+    srclibs:
+      - flutter@2.2.1
+    rm:
+      - ci
+      - src/perfect
+      - src/test
+      - src/ui/flutter_app/ios
+      - src/ui/flutter_app/windows
+      - src/ui/flutter_app/test
+      - src/ui/qt
+      - resources
+      - tests
+    prebuild:
+      - rm src/ui/flutter_app/android/app/build.gradle
+      - mv src/ui/flutter_app/android/app/build.gradle_fdroid src/ui/flutter_app/android/app/build.gradle
+    build:
+      - export PATH=$$flutter$$/bin:$PATH
+      - ./flutter-init.sh
+      - cd src/ui/flutter_app
+      - flutter config --no-analytics
+      - flutter build apk -v --flavor fdroid
+
 MaintainerNotes: |-
     Builds will fail when the srclib ref of flutter and the version with which
     upstream has been built with differ.
@@ -449,5 +475,5 @@ MaintainerNotes: |-
 AutoUpdateMode: Version
 UpdateCheckMode: Tags ^v.*$
 UpdateCheckData: src/ui/flutter_app/pubspec.yaml|version:\s.+\+(\d+)|.|version:\s(.+)\+
-CurrentVersion: 1.0.20
-CurrentVersionCode: 1894
+CurrentVersion: 1.0.21
+CurrentVersionCode: 1901