diff --git a/Dockerfile b/Dockerfile
index 278607b..aa72f6d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ RUN sed -i s@/deb.debian.org/@/mirrors.tuna.tsinghua.edu.cn/@g /etc/apt/sources.
 
 # install joint-teapot
 # TODO: change it to FOCS gitea mirror for deployment
-RUN pip install git+https://ghp.ci/https://github.com/BoYanZh/Joint-Teapot --break-system-packages
+RUN pip install --no-cache-dir git+https://ghp.ci/https://github.com/BoYanZh/Joint-Teapot --break-system-packages
 
 # install joj3 & repo-health-checker
 COPY bin/joj3 bin/repo-health-checker /usr/local/bin/