diff --git a/ci/ci-ubuntu-22.04-3.9/Dockerfile b/ci/ci-ubuntu-22.04-3.9/Dockerfile
index c0f3c6a..1803232 100644
--- a/ci/ci-ubuntu-22.04-3.9/Dockerfile
+++ b/ci/ci-ubuntu-22.04-3.9/Dockerfile
@@ -57,6 +57,9 @@ RUN DEBIAN_FRONTEND=noninteractive \
          python3-numpy \
          python3-opengl \
          python3-pyqt5 \
+         python3-sphinx \
+         python3-sphinx-tabs \
+         python3-breathe \
          python3-yaml \
          python3-zmq \
          python3-six \