diff --git a/gradle.properties b/gradle.properties
index 633c1b7..4f8a9ce 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-grailsVersion=5.3.1
+grailsVersion=6.1.1
 projectVersion=4.0.1-SNAPSHOT
 threeZeroXProjectVersion=3.0.1
 casClientCoreVersion=3.6.4
diff --git a/testapps/spring-security-cas-test1/gradle.properties b/testapps/spring-security-cas-test1/gradle.properties
index f65bdbf..a459642 100644
--- a/testapps/spring-security-cas-test1/gradle.properties
+++ b/testapps/spring-security-cas-test1/gradle.properties
@@ -1,2 +1,2 @@
-grailsVersion=5.3.1
+grailsVersion=6.1.1
 gormVersion=7.2.0
diff --git a/testapps/spring-security-cas-test2/gradle.properties b/testapps/spring-security-cas-test2/gradle.properties
index f65bdbf..a459642 100644
--- a/testapps/spring-security-cas-test2/gradle.properties
+++ b/testapps/spring-security-cas-test2/gradle.properties
@@ -1,2 +1,2 @@
-grailsVersion=5.3.1
+grailsVersion=6.1.1
 gormVersion=7.2.0