diff --git a/sample-apps/gsp/script/.sdkmanrc b/sample-apps/gsp/script/.sdkmanrc
new file mode 100644
index 0000000..2b29e06
--- /dev/null
+++ b/sample-apps/gsp/script/.sdkmanrc
@@ -0,0 +1,2 @@
+java=21.0.4-jbr
+springboot=2.7.18
diff --git a/sample-apps/gsp/script/app.groovy b/sample-apps/gsp/script/app.groovy
index e7819f5..7bbe71c 100644
--- a/sample-apps/gsp/script/app.groovy
+++ b/sample-apps/gsp/script/app.groovy
@@ -1,3 +1,4 @@
+@GrabResolver(name='grails-repo', root='https://repo.grails.org/grails/core/')
 @Grab("org.grails:grails-gsp-spring-boot:6.2.2-SNAPSHOT")
 
 import grails.gsp.TagLib