diff --git a/build.gradle b/build.gradle
index 4b2271f..21a73cb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 ext {
-  interlokCoreVersion = project.findProperty('interlokCoreVersion') ?: '4.9-SNAPSHOT'
+  interlokCoreVersion = project.findProperty('interlokCoreVersion') ?: '5.1-SNAPSHOT'
   releaseVersion = project.findProperty('releaseVersion') ?: '4.9-SNAPSHOT'
   nexusBaseUrl = project.findProperty('nexusBaseUrl') ?: 'https://nexus.adaptris.net/nexus'
   mavenPublishUrl = project.findProperty('mavenPublishUrl') ?: nexusBaseUrl + '/content/repositories/snapshots'