diff --git a/app/build.gradle b/app/build.gradle
index c3c8b8c..a4745aa 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,4 +1,5 @@
 apply plugin: 'android'
+apply plugin: 'witness'
 
 android {
     compileSdkVersion 19
@@ -22,8 +23,8 @@ android {
 dependencies {
     compile project(':botejars')
     compile fileTree(dir: 'libs', include: '*.jar')
-    compile 'com.android.support:support-v4:19.+'
-    compile 'com.android.support:appcompat-v7:19.+'
+    compile 'com.android.support:support-v4:19.1.0'
+    compile 'com.android.support:appcompat-v7:19.1.0'
     // TODO temporary fix for broken developer preview of Support Library
     compile ('com.github.chrisbanes.actionbarpulltorefresh:extra-abc:+') {
         exclude group: 'com.android.support', module: 'support-v4'
@@ -34,6 +35,17 @@ dependencies {
     }
 }
 
+dependencyVerification {
+    verify = [
+            'com.android.support:support-v4:3f40fa7b3a4ead01ce15dce9453b061646e7fe2e7c51cb75ca01ee1e77037f3f',
+            'com.android.support:appcompat-v7:9df7637c5219202ddbbbf0924c2d5a9e6d64379166795a89d8f75d1e3f3372df',
+            'com.github.chrisbanes.actionbarpulltorefresh:extra-abc:a94f35b8b701d2cf761bb6b731d0921f73fb552a69a9c1d1379a19c2a9418ec6',
+            'com.github.chrisbanes.actionbarpulltorefresh:library:ea06f4e8cf7ae959cbe37028acf2631a6950714d2112e16531e4528daf69b6db',
+            'com.github.castorflex.smoothprogressbar:library:eb35b46d99a7f56d3d173cafe5f0f31beaaba0ce606258f81b07b0607ee3c32f',
+            'com.mcxiaoke.viewpagerindicator:library:1e8aad664137f68abdfee94889f6da3dc98be652a235176a403965a07a25de62',
+    ]
+}
+
 def Properties props = new Properties()
 def propFile = new File(project.rootDir, 'signing.properties')
 
diff --git a/build.gradle b/build.gradle
index d3c8c59..76a4eef 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,6 +4,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:0.12.+'
+        classpath files('gradle/libs/gradle-witness.jar')
     }
 }
 
diff --git a/gradle/libs/gradle-witness.jar b/gradle/libs/gradle-witness.jar
new file mode 100644
index 0000000..95cb211
Binary files /dev/null and b/gradle/libs/gradle-witness.jar differ