diff --git a/docker/2_buildpy/build.sh b/docker/2_buildpy/build.sh
index a44b802..13e09c0 100755
--- a/docker/2_buildpy/build.sh
+++ b/docker/2_buildpy/build.sh
@@ -35,7 +35,7 @@ make -j8 install
 ldconfig
 
 # Upgrade pip
-/opt/python/bin/python3 -m pip install -U pip
+/opt/python/bin/python3 -m pip install -U pip 'cryptography<3.4'
 
 # Build mod-wsgi-py3 for Python 3.6
 cd /dpkg/mod-wsgi-*