diff --git a/.zuul.yaml b/.zuul.yaml
index 03d809667..cb923f349 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -154,8 +154,8 @@
     dependencies:
       - opendev-buildset-registry
     requires:
-      - python-builder-container-image
-      - python-base-container-image
+      - python-builder-3.7-container-image
+      - python-base-3.7-container-image
     provides: nodepool-container-image
     vars: &nodepool_image_vars
       docker_images:
@@ -174,8 +174,8 @@
     parent: opendev-upload-docker-image
     description: Build Docker images and upload to Docker Hub.
     requires:
-      - python-builder-container-image
-      - python-base-container-image
+      - python-builder-3.7-container-image
+      - python-base-3.7-container-image
     provides: nodepool-container-image
     vars: *nodepool_image_vars
     secrets:
@@ -204,8 +204,8 @@
       - openstack/diskimage-builder
       - openstack/openstacksdk
     requires:
-      - python-builder-container-image
-      - python-base-container-image
+      - python-builder-3.7-container-image
+      - python-base-3.7-container-image
     provides: nodepool-siblings-container-image
     vars:
       docker_images:
diff --git a/Dockerfile b/Dockerfile
index 3a01cc501..f57bf2d93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,14 +13,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM docker.io/opendevorg/python-builder as builder
+FROM docker.io/opendevorg/python-builder:3.7 as builder
 # ============================================================================
 
 ARG ZUUL_SIBLINGS=""
 COPY . /tmp/src
 RUN assemble
 
-FROM docker.io/opendevorg/python-base as nodepool-base
+FROM docker.io/opendevorg/python-base:3.7 as nodepool-base
 # ============================================================================
 
 COPY --from=builder /output/ /output