diff --git a/klipper/Dockerfile b/klipper/Dockerfile
index 2861dc7..0ea784f 100644
--- a/klipper/Dockerfile
+++ b/klipper/Dockerfile
@@ -9,7 +9,7 @@ ARG MOONRAKER_VENV_DIR=${HOME}/moonraker-env
 
 RUN useradd -d ${HOME} -ms /bin/bash ${USER}
 RUN apt-get update && \
-    apt-get install -y locales git sudo wget curl gzip tar python-virtualenv virtualenv python-dev libffi-dev libncurses-dev libusb-dev gpiod python3-virtualenv python3-dev libopenjp2-7 python3-libgpiod liblmdb0 libsodium-dev
+    apt-get install -y locales git sudo wget curl gzip tar virtualenv python-dev libffi-dev build-essential libncurses-dev libusb-dev gpiod python3-virtualenv python3-dev libopenjp2-7 python3-libgpiod liblmdb0 libsodium-dev
 RUN sed -i -e 's/# en_GB.UTF-8 UTF-8/en_GB.UTF-8 UTF-8/' /etc/locale.gen
 RUN locale-gen
 
diff --git a/klipper/moonraker.ini b/klipper/moonraker.ini
index 7ca77d9..4b6862e 100644
--- a/klipper/moonraker.ini
+++ b/klipper/moonraker.ini
@@ -1,7 +1,7 @@
 [program:moonraker]
 user=klippy
 command=/home/klippy/moonraker-env/bin/python /home/klippy/moonraker/moonraker/moonraker.py -l /var/log/klipper/moonraker.log -c /home/klippy/.config/moonraker.conf
-environment=USER=klippy,HOME=/home/klippy,PYTHONPATH=/home/klippy/moonraker-env/lib/python3.7/site-packages
+environment=USER=klippy,HOME=/home/klippy,PYTHONPATH=/home/klippy/moonraker-env/lib/python3.9/site-packages
 stdout_logfile=/dev/fd/1
 stdout_logfile_maxbytes = 0
 stderr_logfile=/dev/fd/2