diff --git a/Dockerfile b/Dockerfile
index d0d3b603585f862e1314185e50e312c74f2f08df..85735a76ae4b835997f80333e8e2f59e252c99e4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -99,7 +99,7 @@ RUN curl -O https://bootstrap.pypa.io/get-pip.py && \
     rm get-pip.py
 
 RUN pip3 --no-cache-dir install \
-            'ipyparallel' \
+            'ipyparallel==6.3.0' \
             'notebook==6.4.2' \
             'jupyterhub==1.4.2' \
             'jupyterlab==3.0.17' \