diff --git a/imaplugin/version.gradle b/imaplugin/version.gradle
index 9344f03..d90a24f 100644
--- a/imaplugin/version.gradle
+++ b/imaplugin/version.gradle
@@ -1,6 +1,6 @@
 
 // Library Version
-ext.libVersion = 'dev'
+ext.libVersion = '4.31.1-rc1'
 
 // Append short commit hash to dev builds, i.e. "dev.a1b2c3d"
 if (libVersion == 'dev') {