diff --git a/install_alpine.sh b/install_alpine.sh
index 28be1a3..993312f 100755
--- a/install_alpine.sh
+++ b/install_alpine.sh
@@ -155,6 +155,7 @@ EOF
 
   competitiveprogramming() {
     echo "CP..."
+    doas apk add clang15-extra-tools openjdk17
     git clone https://git.junickim.me/junikimm717/linuxcp "$HOME/cp"
     go install git.junickim.me/junikimm717/cpgo@latest
   }