diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index 1534c4b011..70e7f9533d 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -105,7 +105,7 @@
         - system-config-build-image-jinja-init:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-base-3.9-bullseye
+              - name: system-config-build-image-python-base-3.11-bookworm
                 soft: true
         - system-config-build-image-gitea-init:
             dependencies:
@@ -115,7 +115,7 @@
         - system-config-build-image-hound:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-base-3.11-bullseye
+              - name: system-config-build-image-python-base-3.11-bookworm
                 soft: true
         - system-config-build-image-etherpad
         - system-config-build-image-mailman
@@ -132,7 +132,7 @@
         - system-config-build-image-zookeeper-statsd:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-base-3.9-bullseye
+              - name: system-config-build-image-python-base-3.11-bookworm
                 soft: true
         - system-config-build-image-accessbot:
             dependencies:
@@ -142,12 +142,12 @@
         - system-config-build-image-ircbot:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-builder-3.9-bullseye
+              - name: system-config-build-image-python-builder-3.11-bookworm
                 soft: true
         - system-config-build-image-matrix-eavesdrop:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-builder-3.9-bullseye
+              - name: system-config-build-image-python-builder-3.11-bookworm
                 soft: true
         - system-config-build-image-python-base-3.9-bullseye
         - system-config-build-image-python-base-3.10-bullseye
@@ -263,7 +263,7 @@
         - system-config-upload-image-jinja-init:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-upload-image-python-base-3.9-bullseye
+              - name: system-config-upload-image-python-base-3.11-bookworm
                 soft: true
         - system-config-upload-image-gitea-init:
             dependencies:
@@ -273,7 +273,7 @@
         - system-config-upload-image-hound:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-base-3.11-bullseye
+              - name: system-config-build-image-python-base-3.11-bookworm
                 soft: true
         - system-config-upload-image-assets
         - system-config-upload-image-etherpad
@@ -292,7 +292,7 @@
         - system-config-upload-image-zookeeper-statsd:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-upload-image-python-base-3.9-bullseye
+              - name: system-config-upload-image-python-base-3.11-bookworm
                 soft: true
         - system-config-upload-image-accessbot:
             dependencies:
@@ -302,12 +302,12 @@
         - system-config-upload-image-ircbot:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-upload-image-python-builder-3.9-bullseye
+              - name: system-config-upload-image-python-builder-3.11-bookworm
                 soft: true
         - system-config-upload-image-matrix-eavesdrop:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-upload-image-python-builder-3.9-bullseye
+              - name: system-config-upload-image-python-builder-3.11-bookworm
                 soft: true
         - system-config-upload-image-python-base-3.9-bullseye
         - system-config-upload-image-python-base-3.10-bullseye