diff --git a/app/build.gradle b/app/build.gradle
index bb648cd7..b35af2de 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -105,8 +105,7 @@ dependencies {
     compile 'com.github.ksoichiro:android-observablescrollview:1.6.0'
     compile 'com.squareup.retrofit2:retrofit:2.3.0'
     compile 'com.squareup.retrofit2:converter-gson:2.3.0'
-    //noinspection GradleDynamicVersion
-    compile 'com.anjlab.android.iab.v3:library:1.0.+'
+    compile 'com.anjlab.android.iab.v3:library:1.0.40'
     compile 'de.psdev.licensesdialog:licensesdialog:1.8.1'
     compile 'com.github.bumptech.glide:glide:3.8.0'
     compile 'com.github.bumptech.glide:okhttp3-integration:1.5.0'