diff --git a/owncloudComLibrary/build.gradle b/owncloudComLibrary/build.gradle
index 77145f18..7415fef9 100644
--- a/owncloudComLibrary/build.gradle
+++ b/owncloudComLibrary/build.gradle
@@ -7,11 +7,11 @@ dependencies {
 }
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 28
 
     defaultConfig {
         minSdkVersion 14
-        targetSdkVersion 26
+        targetSdkVersion 28
     }
 
     lintOptions {
diff --git a/sample_client/build.gradle b/sample_client/build.gradle
index 63a25180..71aa058b 100644
--- a/sample_client/build.gradle
+++ b/sample_client/build.gradle
@@ -5,11 +5,11 @@ dependencies {
 }
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 28
 
     defaultConfig {
         minSdkVersion 14
-        targetSdkVersion 26
+        targetSdkVersion 28
     }
 
     lintOptions {