diff --git a/.devcontainer/keycloak/Dockerfile b/.devcontainer/keycloak/Dockerfile
index 1d8fb936..e8da2018 100644
--- a/.devcontainer/keycloak/Dockerfile
+++ b/.devcontainer/keycloak/Dockerfile
@@ -1,18 +1,14 @@
 # https://www.keycloak.org/server/containers
 ARG KEYCLOAK_VERSION=26.0.1
 
-# https://hub.docker.com/_/buildpack-deps
-FROM buildpack-deps:curl AS downloader
-ARG KEYCLOAK_VERSION
-# https://github.com/jacekkow/keycloak-protocol-cas
-RUN curl -Lo /tmp/keycloak-protocol-cas.jar https://github.com/jacekkow/keycloak-protocol-cas/releases/download/${KEYCLOAK_VERSION}/keycloak-protocol-cas-${KEYCLOAK_VERSION}.jar;
-
 # https://github.com/keycloak/keycloak/tree/main/quarkus/container
 # https://quay.io/repository/keycloak/keycloak?tab=tags
 FROM quay.io/keycloak/keycloak:${KEYCLOAK_VERSION}
+ARG KEYCLOAK_VERSION
 
 # add CAS protocol for Keycloak
-COPY --from=downloader --chown=keycloak:keycloak /tmp/keycloak-protocol-cas.jar /opt/keycloak/providers/
+# https://github.com/jacekkow/keycloak-protocol-cas
+ADD --chown=keycloak:keycloak https://github.com/jacekkow/keycloak-protocol-cas/releases/download/${KEYCLOAK_VERSION}/keycloak-protocol-cas-${KEYCLOAK_VERSION}.jar /opt/keycloak/providers/keycloak-protocol-cas.jar
 
 WORKDIR /opt/keycloak