diff --git a/build.gradle b/build.gradle
index 278fe41110..592d41ebc8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,10 +4,12 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:0.9.+'
+        classpath files('libs/gradle-witness.jar')
     }
 }
 
 apply plugin: 'android'
+apply plugin: 'witness'
 
 repositories {
     mavenCentral()
@@ -28,6 +30,20 @@ dependencies {
     compile project(':library')
 }
 
+dependencyVerification {
+    verify = [
+        'com.actionbarsherlock:actionbarsherlock:5ab04d74101f70024b222e3ff9c87bee151ec43331b4a2134b6cc08cf8565819',
+        'com.android.support:support-v4:a4268abd6370c3fd3f94d2a7f9e6e755f5ddd62450cf8bbc62ba789e1274d585',
+        'com.google.android.gcm:gcm-client:5ff578202f93dcba1c210d015deb4241c7cdad9b7867bd1b32e0a5f4c16986ca',
+        'se.emilsjolander:stickylistheaders:89146b46c96fea0e40200474a2625cda10fe94891e4128f53cdb42375091b9b6',
+        'org.whispersystems.textsecure:textsecure-library:246e275ea80bdc65d11f08043f9b2765def60c0bdf1da340a864e4656f59a750',
+        'com.google.protobuf:protobuf-java:ad9769a22989e688a46af4d3accc348cc501ced22118033230542bc916e33f0b',
+        'com.madgag:sc-light-jdk15on:931f39d351429fb96c2f749e7ecb1a256a8ebbf5edca7995c9cc085b94d1841d',
+        'com.googlecode.libphonenumber:libphonenumber:c2cffa5c2ccb8fd5fc4b432aa7d1ee27482860c9751035a25c8ffa2375274fcf',
+        'org.whispersystems:gson:08f4f7498455d1539c9233e5aac18e9b1805815ef29221572996508eb512fe51',
+    ]
+}
+
 android {
     compileSdkVersion 19
     buildToolsVersion '19.0.2'
diff --git a/libs/gradle-witness.jar b/libs/gradle-witness.jar
new file mode 100644
index 0000000000..5bb5f443e5
Binary files /dev/null and b/libs/gradle-witness.jar differ