diff --git a/jupyterhub/Dockerfile b/jupyterhub/Dockerfile
index 9e559c1891b9f169b79db8d6ea5277d66bdc747c..fa4ebf603c4b4436496914dbbb46f4f5f5826d0c 100755
--- a/jupyterhub/Dockerfile
+++ b/jupyterhub/Dockerfile
@@ -43,7 +43,7 @@ RUN python${PYTHON_VERSION} -m pip --no-cache-dir install \
 RUN mkdir -p ~/.venv && \
     python${PYTHON_VERSION} -m venv ~/.venv/robofish && \
     . ~/.venv/robofish/bin/activate && \
-    pip --no-cache-dir install --upgrade pip==20.1.1 && \
+    python${PYTHON_VERSION} -m pip --no-cache-dir install --upgrade pip==20.1.1 && \
     pip --no-cache-dir install --upgrade setuptools==49.1.0 && \
     pip install tensorflow==1.15.3 && \
     pip --no-cache-dir install \