diff --git a/Dockerfile b/Dockerfile
index aff0de3..4c49155 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,8 +18,8 @@ USER jenkins
 
 RUN curl -s "https://get.sdkman.io" | bash
 RUN source "$HOME/.sdkman/bin/sdkman-init.sh" &&\
-    sdk install java `sdk ls java | grep librca | grep " 17" | grep -m 1 -Eo "(.?[0-9]{1,2}){3}" | head -1`-librca &&\
-    sdk default java `sdk ls java | grep librca | grep " 17" | grep -m 1 -Eo "(.?[0-9]{1,2}){3}" | head -1`-librca
+    sdk install java `sdk ls java | grep librca | grep " 21" | grep -m 1 -Eo "(.?[0-9]{1,2}){3}" | head -1`-librca &&\
+    sdk default java `sdk ls java | grep librca | grep " 21" | grep -m 1 -Eo "(.?[0-9]{1,2}){3}" | head -1`-librca
 
 RUN cd /var/jenkins_home/ && wget http://mirrors.jenkins.io/war-stable/2.426.1/jenkins.war