diff --git a/k9mail/build.gradle b/k9mail/build.gradle
index 532d83f3d..8428e6892 100644
--- a/k9mail/build.gradle
+++ b/k9mail/build.gradle
@@ -34,7 +34,7 @@ dependencies {
     }
 
     // Forked version of javax.mail required to run Greenmail on Android
-    androidTestCompile 'eu.ocathain.com.sun.mail:javax.mail:1.5.3'
+    androidTestCompile 'eu.ocathain.com.sun.mail:javax.mail:1.5.2'
     androidTestCompile 'eu.ocathain.javax.activation:activation:1.1.1'
 
     androidTestCompile 'com.madgag.spongycastle:pg:1.51.0.0'