diff --git a/GNUmakefile b/GNUmakefile
index 06999e59..3fdf50ac 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -722,10 +722,11 @@ out/apk/TildeFriends-arm-%.unsigned.apk:
 	@cp out/android$(BUILD_TYPE)-armv7a/tildefriends out/apk-arm-$(BUILD_TYPE)/lib/armeabi-v7a/tildefriends.so
 	@$(ANDROID_NDK)/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip out/apk-arm-$(BUILD_TYPE)/lib/arm64-v8a/tildefriends.so
 	@$(ANDROID_NDK)/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip out/apk-arm-$(BUILD_TYPE)/lib/armeabi-v7a/tildefriends.so
-	@cp out/apk/res.apk $@
+	@cp out/apk/res.apk $@.zip
 	@cp out/apk/classes.dex out/apk-arm-$(BUILD_TYPE)/
-	@cd out/apk-arm-$(BUILD_TYPE) && zip -u ../../$@ -q -9 -r . && cd ../../
-	@zip -u $@ -q -9 $(RAW_FILES)
+	@cd out/apk-arm-$(BUILD_TYPE) && zip -u ../../$@.zip -q -9 -r . && cd ../../
+	@zip -u $@.zip -q $(RAW_FILES)
+	@rm -f $@ && $(ANDROID_BUILD_TOOLS)/zipalign -z 4 $@.zip $@
 
 out/apk/TildeFriends-x86-%.unsigned.apk:
 	@mkdir -p $(dir $@) out/apk-x86-$(BUILD_TYPE)/lib/x86_64/ out/apk-x86-$(BUILD_TYPE)/lib/x86/
@@ -734,14 +735,15 @@ out/apk/TildeFriends-x86-%.unsigned.apk:
 	@cp out/android$(BUILD_TYPE)-x86/tildefriends out/apk-x86-$(BUILD_TYPE)/lib/x86/tildefriends.so
 	@$(ANDROID_NDK)/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip out/apk-x86-$(BUILD_TYPE)/lib/x86_64/tildefriends.so
 	@$(ANDROID_NDK)/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip out/apk-x86-$(BUILD_TYPE)/lib/x86/tildefriends.so
-	@cp out/apk/res.apk $@
+	@cp out/apk/res.apk $@.zip
 	@cp out/apk/classes.dex out/apk-x86-$(BUILD_TYPE)/
-	@cd out/apk-x86-$(BUILD_TYPE) && zip -u ../../$@ -q -9 -r . && cd ../../
-	@zip -u $@ -q -9 $(RAW_FILES)
+	@cd out/apk-x86-$(BUILD_TYPE) && zip -u ../../$@.zip -q -9 -r . && cd ../../
+	@zip -u $@.zip -q $(RAW_FILES)
+	@rm -f $@ && $(ANDROID_BUILD_TOOLS)/zipalign -z 4 $@.zip $@
 
 out/%.apk: out/apk/%.unsigned.apk
 	@echo "[apksigner] $(notdir $@)"
-	@$(ANDROID_BUILD_TOOLS)/apksigner sign --ks .keys/android.jks --ks-key-alias androidKey --ks-pass pass:android --key-pass pass:android --out $@ $<
+	@$(ANDROID_BUILD_TOOLS)/apksigner sign --ks .keys/android.jks --ks-key-alias androidKey --ks-pass pass:android --key-pass pass:android --min-sdk-version $(ANDROID_MIN_SDK_VERSION) --out $@ $<
 
 release-apk: out/TildeFriends-arm-release.apk out/TildeFriends-x86-release.apk
 .PHONY: release-apk