diff --git a/Dockerfile b/Dockerfile
index f6c1a31..fb33307 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -71,7 +71,7 @@ ENV PATH="${PY_VENV}/bin:$PATH"
 # cache.  This results in a smaller final image, at the cost of
 # slightly longer install times.
 ###
-RUN pip install --no-cache-dir --upgrade \
+RUN pip3 install --no-cache-dir --upgrade \
     pip \
     setuptools \
     wheel