diff --git a/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile b/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile
index 1bb658b8e42..390ab453136 100644
--- a/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile
+++ b/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile
@@ -27,5 +27,4 @@ RUN /opt/python/cp27-cp27mu/bin/pip install --upgrade cython
 RUN /opt/python/cp35-cp35m/bin/pip install --upgrade cython
 RUN /opt/python/cp36-cp36m/bin/pip install --upgrade cython
 RUN /opt/python/cp37-cp37m/bin/pip install --upgrade cython
-RUN /opt/python/cp37-cp37m/bin/pip install --upgrade cython
 RUN /opt/python/cp38-cp38/bin/pip install --upgrade cython
diff --git a/tools/dockerfile/grpc_artifact_python_manylinux2010_x86/Dockerfile b/tools/dockerfile/grpc_artifact_python_manylinux2010_x86/Dockerfile
index 61c901e2f9c..6e5e43315e7 100644
--- a/tools/dockerfile/grpc_artifact_python_manylinux2010_x86/Dockerfile
+++ b/tools/dockerfile/grpc_artifact_python_manylinux2010_x86/Dockerfile
@@ -27,5 +27,4 @@ RUN /opt/python/cp27-cp27mu/bin/pip install --upgrade cython
 RUN /opt/python/cp35-cp35m/bin/pip install --upgrade cython
 RUN /opt/python/cp36-cp36m/bin/pip install --upgrade cython
 RUN /opt/python/cp37-cp37m/bin/pip install --upgrade cython
-RUN /opt/python/cp37-cp37m/bin/pip install --upgrade cython
 RUN /opt/python/cp38-cp38/bin/pip install --upgrade cython