diff --git a/ci-container/Dockerfile b/ci-container/Dockerfile
index 9f53608..3360e50 100644
--- a/ci-container/Dockerfile
+++ b/ci-container/Dockerfile
@@ -3,4 +3,5 @@ RUN apk add --no-cache curl build-base clang22-extra-tools mosquitto-dev sdl3-de
 
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
 ENV PATH="/root/.cargo/bin:${PATH}"
+RUN rustup default stable