diff --git a/docker/deploy-env/Dockerfile b/docker/deploy-env/Dockerfile
index b5a128ac4bdb4561d012eed6f06f5b35cabc97b8..62a1e3f212f4c5a593f4230b731b83ff12ee2f9b 100644
--- a/docker/deploy-env/Dockerfile
+++ b/docker/deploy-env/Dockerfile
@@ -10,7 +10,7 @@ RUN set -e -x ;\
         llvm \
         python3-pip ;\
     pip3 install \
-        clang \
+        clang==10.0.1 \
         sphinx \
         sphinx_rtd_theme ;\
     rm -rf /var/lib/apt/lists