diff --git a/ubuntu-20.04-python36/Dockerfile b/ubuntu-20.04-python36/Dockerfile
index 21da425..f744918 100644
--- a/ubuntu-20.04-python36/Dockerfile
+++ b/ubuntu-20.04-python36/Dockerfile
@@ -5,7 +5,7 @@ RUN apt update -y \
 && apt install -y software-properties-common \
 && add-apt-repository ppa:deadsnakes/ppa \
 && apt update -y \
-&& apt install -y curl python3.6 python3.6-distutils python3-pip \
+&& apt install -y curl python3.6 python3.6-dev python3.6-distutils python3-pip \
 && LMOD_VERSION=8.7.53 \
 && curl -OL https://github.com/surak/Lmod/releases/download/${LMOD_VERSION}/lmod_${LMOD_VERSION}_all.deb \
 && apt install -y ./lmod_${LMOD_VERSION}_all.deb