diff --git a/build.gradle b/build.gradle
index 58dc03ba..7c105039 100644
--- a/build.gradle
+++ b/build.gradle
@@ -28,6 +28,7 @@ buildscript {
 allprojects {
     apply plugin: 'idea'
     ext.androidBuildVersionTools = "27.0.3"
+    ext.supportLibraryVersion = "27.0.2"
 }
 
 def androidCompileSdk() { return 27 }
@@ -39,5 +40,6 @@ def androidMinSdk() { return 7 }
 subprojects {
     repositories {
         jcenter()
+        maven { url "https://maven.google.com" }
     }
 }
diff --git a/microg-ui-tools/build.gradle b/microg-ui-tools/build.gradle
index 362e733b..19543d21 100644
--- a/microg-ui-tools/build.gradle
+++ b/microg-ui-tools/build.gradle
@@ -47,8 +47,8 @@ android {
 }
 
 dependencies {
-    api 'com.android.support:support-v4:25.3.1'
-    api 'com.android.support:appcompat-v7:25.3.1'
-    api 'com.takisoft.fix:preference-v7:25.3.1.0'
+    implementation "com.android.support:support-v4:$supportLibraryVersion"
+    implementation "com.android.support:appcompat-v7:$supportLibraryVersion"
+    implementation "com.takisoft.fix:preference-v7:$supportLibraryVersion.0"
 }