diff --git a/tools/docker/python/amd64/alpine.Dockerfile b/tools/docker/python/amd64/alpine.Dockerfile
index fb6f129451..698c290682 100644
--- a/tools/docker/python/amd64/alpine.Dockerfile
+++ b/tools/docker/python/amd64/alpine.Dockerfile
@@ -14,7 +14,7 @@ RUN apk add --no-cache swig
 RUN apk add --no-cache python3-dev py3-pip py3-wheel py3-virtualenv \
  py3-numpy py3-pandas py3-matplotlib
 RUN rm -f /usr/lib/python3.*/EXTERNALLY-MANAGED \
-&& python3 -m pip install absl-py mypy-protobuf
+&& python3 -m pip install absl-py mypy mypy-protobuf
 
 ################
 ##  OR-TOOLS  ##
diff --git a/tools/docker/python/arm64v8/alpine.Dockerfile b/tools/docker/python/arm64v8/alpine.Dockerfile
index 8219b09b33..1ae0f119aa 100644
--- a/tools/docker/python/arm64v8/alpine.Dockerfile
+++ b/tools/docker/python/arm64v8/alpine.Dockerfile
@@ -14,7 +14,7 @@ RUN apk add --no-cache swig
 RUN apk add --no-cache python3-dev py3-pip py3-wheel py3-virtualenv \
  py3-numpy py3-pandas py3-matplotlib
 RUN rm -f /usr/lib/python3.*/EXTERNALLY-MANAGED \
-&& python3 -m pip install absl-py mypy-protobuf
+&& python3 -m pip install absl-py mypy mypy-protobuf
 
 ################
 ##  OR-TOOLS  ##