diff --git a/plugins/Android-PullToRefresh/library/build.gradle b/plugins/Android-PullToRefresh/library/build.gradle
index e018fa664..e0d12a533 100644
--- a/plugins/Android-PullToRefresh/library/build.gradle
+++ b/plugins/Android-PullToRefresh/library/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 21
-    buildToolsVersion '20.0.0'
+    buildToolsVersion '21.1.2'
 
     sourceSets {
         main {
diff --git a/plugins/HoloColorPicker/build.gradle b/plugins/HoloColorPicker/build.gradle
index 91b9588e2..96916a7e9 100644
--- a/plugins/HoloColorPicker/build.gradle
+++ b/plugins/HoloColorPicker/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 21
-    buildToolsVersion '20.0.0'
+    buildToolsVersion '21.1.2'
 
     sourceSets {
         main {
diff --git a/plugins/ckChangeLog/library/build.gradle b/plugins/ckChangeLog/library/build.gradle
index cb5a771d3..293082bcd 100644
--- a/plugins/ckChangeLog/library/build.gradle
+++ b/plugins/ckChangeLog/library/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 21
-    buildToolsVersion '20.0.0'
+    buildToolsVersion '21.1.2'
 
     sourceSets {
         main {
diff --git a/plugins/openpgp-api-library/build.gradle b/plugins/openpgp-api-library/build.gradle
index effba1e16..83aafc370 100644
--- a/plugins/openpgp-api-library/build.gradle
+++ b/plugins/openpgp-api-library/build.gradle
@@ -13,7 +13,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 21
-    buildToolsVersion '20.0.0'
+    buildToolsVersion '21.1.2'
 
     // NOTE: We are using the old folder structure to also support Eclipse
     sourceSets {