diff --git a/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile b/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile
index 390ab453136..287ed1c2725 100644
--- a/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile
+++ b/tools/dockerfile/grpc_artifact_python_manylinux2010_x64/Dockerfile
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 # Docker file for building gRPC manylinux Python artifacts.
+# Updated: 2020-06-25
 
 FROM quay.io/pypa/manylinux2010_x86_64
 
@@ -28,3 +29,4 @@ 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/cp38-cp38/bin/pip install --upgrade cython
+RUN /opt/python/cp39-cp39/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 6e5e43315e7..240165a0e42 100644
--- a/tools/dockerfile/grpc_artifact_python_manylinux2010_x86/Dockerfile
+++ b/tools/dockerfile/grpc_artifact_python_manylinux2010_x86/Dockerfile
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 # Docker file for building gRPC manylinux Python artifacts.
+# Updated: 2020-06-25
 
 FROM quay.io/pypa/manylinux2010_i686
 
@@ -28,3 +29,4 @@ 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/cp38-cp38/bin/pip install --upgrade cython
+RUN /opt/python/cp39-cp39/bin/pip install --upgrade cython
diff --git a/tools/dockerfile/grpc_artifact_python_manylinux2014_x64/Dockerfile b/tools/dockerfile/grpc_artifact_python_manylinux2014_x64/Dockerfile
index 5e8fed0a0f2..ef90555174d 100644
--- a/tools/dockerfile/grpc_artifact_python_manylinux2014_x64/Dockerfile
+++ b/tools/dockerfile/grpc_artifact_python_manylinux2014_x64/Dockerfile
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 # Docker file for building gRPC manylinux Python artifacts.
+# Updated: 2020-06-25
 
 FROM quay.io/pypa/manylinux2014_x86_64
 
@@ -26,3 +27,4 @@ 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/cp38-cp38/bin/pip install --upgrade cython
+RUN /opt/python/cp39-cp39/bin/pip install --upgrade cython
diff --git a/tools/dockerfile/grpc_artifact_python_manylinux2014_x86/Dockerfile b/tools/dockerfile/grpc_artifact_python_manylinux2014_x86/Dockerfile
index 6695f642f74..ff23414ae4e 100644
--- a/tools/dockerfile/grpc_artifact_python_manylinux2014_x86/Dockerfile
+++ b/tools/dockerfile/grpc_artifact_python_manylinux2014_x86/Dockerfile
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 # Docker file for building gRPC manylinux Python artifacts.
+# Updated: 2020-06-25
 
 FROM quay.io/pypa/manylinux2014_i686
 
@@ -26,3 +27,4 @@ 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/cp38-cp38/bin/pip install --upgrade cython
+RUN /opt/python/cp39-cp39/bin/pip install --upgrade cython