diff --git a/Dockerfile.debian11 b/Dockerfile.debian11
index fd2346e..cac9c07 100644
--- a/Dockerfile.debian11
+++ b/Dockerfile.debian11
@@ -148,6 +148,9 @@ RUN colcon \
 # add default.yaml to the image
 ADD defaults.yaml /root/.colcon/defaults.yaml
 
+# there is no python3-graphviz on debian11, so install it via pip 
+RUN pip3 install graphviz
+
 # set up sourcing of ros
 COPY ./ros_entrypoint.sh /
 ENTRYPOINT [ "/ros_entrypoint.sh" ]
diff --git a/Dockerfile.debian12 b/Dockerfile.debian12
index 7d3416f..ddc8af2 100644
--- a/Dockerfile.debian12
+++ b/Dockerfile.debian12
@@ -143,6 +143,9 @@ RUN colcon \
 # add default.yaml to the image
 ADD defaults.yaml /root/.colcon/defaults.yaml
 
+# there is no python3-graphviz on debian12, so install it via pip 
+RUN pip3 install graphviz --break-system-packages
+
 # set up sourcing of ros
 COPY ./ros_entrypoint.sh /
 ENTRYPOINT [ "/ros_entrypoint.sh" ]