diff --git a/docker/python-base/Dockerfile b/docker/python-base/Dockerfile
index b2fb3177d7..5b1b446562 100644
--- a/docker/python-base/Dockerfile
+++ b/docker/python-base/Dockerfile
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM python:slim
+FROM python:3.7-slim
 
 RUN apt-get update \
   && apt-get install -y dumb-init libjemalloc2 \
diff --git a/docker/python-builder/Dockerfile b/docker/python-builder/Dockerfile
index e8dd278f05..a1103fb6ae 100644
--- a/docker/python-builder/Dockerfile
+++ b/docker/python-builder/Dockerfile
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 
-FROM python:slim as fake-python
+FROM python:3.7-slim as fake-python
 
 WORKDIR /tmp
 RUN apt-get update \
@@ -23,7 +23,7 @@ RUN apt-get update \
 COPY python3-dev.control /tmp/python3-dev.control
 RUN equivs-build /tmp/python3-dev.control
 
-FROM python:slim
+FROM python:3.7-slim
 
 COPY --from=fake-python /tmp/python3-dev_4.0.0_all.deb /tmp/python3-dev_4.0.0_all.deb
 COPY scripts/assemble /usr/local/bin/assemble