diff --git a/ci/docker_images/ubuntu/bionic/Dockerfile b/ci/docker_images/ubuntu/bionic/Dockerfile
index d8a3985a950bdb115008af999cecff3341ec218c..1657b8e9a35a705530c4f475301884abdbf060e5 100644
--- a/ci/docker_images/ubuntu/bionic/Dockerfile
+++ b/ci/docker_images/ubuntu/bionic/Dockerfile
@@ -209,6 +209,8 @@ RUN cd /tmp                                      \
 # ensure all libraries are known by the runtime linker
 RUN ldconfig
 
+RUN apt-get update && apt-get install -y python-tk
+
 # clean cached packages
 RUN rm -rf /var/lib/apt/lists/*
 RUN rm -rf $HOME/.cache/pip/*