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diff --git a/mobile/scripts/fdroid_build_isar.sh b/mobile/scripts/fdroid_build_isar.sh
old mode 100644
new mode 100755
index 44f59c69ae..41517737c9
--- a/mobile/scripts/fdroid_build_isar.sh
+++ b/mobile/scripts/fdroid_build_isar.sh
@@ -1,6 +1,8 @@
 #!/usr/bin/env sh
 
-cd .isar || exit
+test -d .isar || exit
+cp .isar-cargo.lock .isar/Cargo.lock
+(cd .isar || exit
 bash tool/build_android.sh x86
 bash tool/build_android.sh x64
 bash tool/build_android.sh armv7
@@ -13,4 +15,4 @@ mv libisar_android_x64.so libisar.so
 mv libisar.so ../.pub-cache/hosted/pub.dev/isar_flutter_libs-*/android/src/main/jniLibs/x86_64/
 mv libisar_android_x86.so libisar.so
 mv libisar.so ../.pub-cache/hosted/pub.dev/isar_flutter_libs-*/android/src/main/jniLibs/x86/
-cd ..
\ No newline at end of file
+)
\ No newline at end of file
diff --git a/mobile/scripts/fdroid_update_isar.sh b/mobile/scripts/fdroid_update_isar.sh
new file mode 100755
index 0000000000..814f50a8a1
--- /dev/null
+++ b/mobile/scripts/fdroid_update_isar.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env sh
+
+isar_version="$(awk '/isar: /{gsub(/\^/, "", $2); print $2}' pubspec.yaml)"
+checked_out_version="$(git -C .isar describe --tags)"
+
+if [ "$isar_version" = "$checked_out_version" ]; then
+  echo "isar is up-to-date."
+  exit 0
+fi
+echo "Updating from version $checked_out_version to $isar_version."
+
+git -C .isar checkout "$isar_version"
+cargo generate-lockfile --manifest-path .isar/Cargo.toml
+mv .isar/Cargo.lock .isar-cargo.lock