diff --git a/containers/docker/Dockerfile b/containers/docker/Dockerfile
index 0ce0cef3c01c5ee5f5237cafc12d27e518fddfc2..853e6472625314f87df30f83a537106c4c931cea 100644
--- a/containers/docker/Dockerfile
+++ b/containers/docker/Dockerfile
@@ -114,7 +114,7 @@ RUN cd /tmp             \
 
 RUN cd /tmp  \
       && apt-get install -y libtbb-dev \
-      && pip install six \
+      && pip3 install six \
       && source /usr/local/bin/thisroot.sh \
       && source /usr/local/bin/geant4.sh \
       && source /usr/local/bin/thisdd4hep.sh \