diff --git a/app/build.gradle b/app/build.gradle
index 9b2bf1c6..900306ee 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -24,7 +24,7 @@ android {
 
     defaultConfig {
         applicationId "com.xypower.mpapp"
-        minSdk 25
+        minSdk COMPILE_MIN_SDK_VERSION as int
         //noinspection ExpiredTargetSdkVersion
         targetSdk 28
         versionCode AppVersionCode
diff --git a/gradle.properties b/gradle.properties
index eb8cc61f..70dee003 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -18,6 +18,11 @@ android.nonTransitiveRClass=true
 android.useAndroidX=true
 android.enableJetifier=true
 
+BUILD_TOOLS_VERSION=33.0.3
+COMPILE_SDK_VERSION=33
+TARGET_SDK_VERSION=28
+COMPILE_MIN_SDK_VERSION=25
+
 opencvsdk=D:/Workspace/deps/opencv-mobile-4.9.0-android
 # opencvsdk=D:/Workspace/deps/opencv-mobile-3.4.20-android
 coreroot=D:/Workspace/Github/xymp/xymp/Core