diff --git a/Dockerfile-dev b/Dockerfile-dev
index 2a89b2ff5..c09e04ac3 100644
--- a/Dockerfile-dev
+++ b/Dockerfile-dev
@@ -20,10 +20,10 @@ WORKDIR /opt/certbot/src
 # If <dest> doesn't exist, it is created along with all missing
 # directories in its path.
 
-# TODO: Install non-default Python versions for tox.
 # TODO: Install Apache/Nginx for plugin development.
 COPY letsencrypt-auto-source/letsencrypt-auto /opt/certbot/src/letsencrypt-auto-source/letsencrypt-auto
 RUN /opt/certbot/src/letsencrypt-auto-source/letsencrypt-auto --os-packages-only && \
+    apt-get install python3-dev -y && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* \
            /tmp/* \