diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index 03fbb423..ca7ec6a8 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -13,10 +13,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: set up JDK 11
+    - name: set up JDK 17
       uses: actions/setup-java@v4
       with:
-        java-version: '11'
+        java-version: '17'
         distribution: 'temurin'
         cache: gradle
 
diff --git a/app/build.gradle b/app/build.gradle
index ccbe2dee..0f9c4e1a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,16 +10,14 @@ android {
     buildTypes {
         release {
             minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.txt'
         }
     }
-    namespace 'com.holokenmod'
-    lint {
-        disable 'ExpiredTargetSdkVersion'
-    }
+    namespace = 'com.holokenmod'
 }
 repositories {
     google()
+    mavenCentral()
  }
 
 dependencies {
diff --git a/app/src/main/java/com/srlee/DLX/DLX.java b/app/src/main/java/com/srlee/DLX/DLX.java
index 62f8ccd3..0550eeb9 100644
--- a/app/src/main/java/com/srlee/DLX/DLX.java
+++ b/app/src/main/java/com/srlee/DLX/DLX.java
@@ -194,7 +194,7 @@ private void search(int k)
         if (root.GetRight() == root)
         {
         	foundsolution = new ArrayList<Integer>(trysolution);
-            NumSolns++;
+        	NumSolns++;
             return;
         }
         chosenCol = ChooseMinCol();