diff --git a/cel/tekton/publish.yaml b/cel/tekton/publish.yaml
index 6b154c47d..a81320637 100644
--- a/cel/tekton/publish.yaml
+++ b/cel/tekton/publish.yaml
@@ -46,7 +46,7 @@ spec:
   steps:
 
   - name: create-ko-yaml
-    image: busybox
+    image: docker.io/library/busybox@sha256:c230832bd3b0be59a6c47ed64294f9ce71e91b327957920b6929a0caa8353140
     script: |
       #!/bin/sh
       set -ex
@@ -62,7 +62,7 @@ spec:
       cat ${PROJECT_ROOT}/.ko.yaml
 
   - name: container-registy-auth
-    image: gcr.io/go-containerregistry/crane:debug
+    image: gcr.io/go-containerregistry/crane:debug@sha256:ff0e08eeae8097d28b2381c7f7123bf542757abc68d11bff58fb882b72843785
     script: |
       #!/busybox/sh
       set -ex
@@ -81,7 +81,7 @@ spec:
       cp ${DOCKER_CONFIG} /workspace/docker-config.json
 
   - name: run-ko
-    image: gcr.io/tekton-releases/dogfooding/ko:latest
+    image: gcr.io/tekton-releases/dogfooding/ko:v20240926-3daa55a03e@sha256:393155dbdd7c8d920925b202c88e4846f46a70c1e1dc218b0ea5e2d7e388b576
     env:
     - name: KO_DOCKER_REPO
       value: $(params.imageRegistry)/$(params.imageRegistryPath)
@@ -131,7 +131,7 @@ spec:
       ko resolve --platform=$(params.platforms) --preserve-import-paths -f ${PROJECT_ROOT}/config/ > $OUTPUT_RELEASE_DIR/release.notags.yam.
 
   - name: koparse
-    image: gcr.io/tekton-releases/dogfooding/koparse:latest
+    image: gcr.io/tekton-releases/dogfooding/koparse:v20240910-ec3cf3c749@sha256:5e8a522fc1e587fc00b69a6d73e0bfdf7a29ca143537a5542eb224680d2dbf2f
     script: |
       set -ex
 
@@ -148,7 +148,7 @@ spec:
         --base ${IMAGES_PATH} --images ${IMAGES} > /workspace/built_images
 
   - name: tag-images
-    image: gcr.io/go-containerregistry/crane:debug
+    image: gcr.io/go-containerregistry/crane:debug@sha256:ff0e08eeae8097d28b2381c7f7123bf542757abc68d11bff58fb882b72843785
     script: |
       #!/busybox/sh
       set -ex
diff --git a/cel/tekton/release-pipeline.yaml b/cel/tekton/release-pipeline.yaml
index 5e45a9678..d5ce8f02d 100644
--- a/cel/tekton/release-pipeline.yaml
+++ b/cel/tekton/release-pipeline.yaml
@@ -166,7 +166,7 @@ spec:
             description: The full URL of the release file (no tag) in the bucket
         steps:
           - name: create-results
-            image: alpine
+            image: docker.io/library/alpine:3.20.3@sha256:beefdbd8a1da6d2915566fde36db9db0b524eb737fc57cd1367effd16dc0d06d
             script: |
               echo "$(params.releaseBucket)/previous/$(params.versionTag)/release.yaml" > $(results.release.path)
               echo "$(params.releaseBucket)/previous/$(params.versionTag)/release.notag.yaml" > $(results.release-no-tag.path)