diff --git a/Dockerfile b/Dockerfile
index 97b987a2..142b5f3a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.21@sha256:11dc65e21b82057c973c56dce4f98d35b41cbda36fbd818ba698d3c7cf9bae8c as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -19,7 +19,7 @@ RUN CGO_ENABLED=0 GOOS=linux go build -a -o manager main.go
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details
-FROM registry.access.redhat.com/ubi9/ubi-minimal
+FROM registry.access.redhat.com/ubi9/ubi-minimal@sha256:a340f4b9fb261a75c84666a3dccb88e193a116da3cebabaf9bcdc33609b61172
 WORKDIR /
 COPY --from=builder /workspace/manager .
 USER 65532:65532
diff --git a/ci.Dockerfile b/ci.Dockerfile
index 724b6a1b..8d2c270a 100644
--- a/ci.Dockerfile
+++ b/ci.Dockerfile
@@ -1,4 +1,4 @@
-FROM registry.access.redhat.com/ubi9/ubi-minimal
+FROM registry.access.redhat.com/ubi9/ubi-minimal@sha256:a340f4b9fb261a75c84666a3dccb88e193a116da3cebabaf9bcdc33609b61172
 WORKDIR /
 COPY bin/manager .
 USER 65532:65532
diff --git a/config/manager/kustomization.yaml b/config/manager/kustomization.yaml
index f1b46b35..dfca9b83 100644
--- a/config/manager/kustomization.yaml
+++ b/config/manager/kustomization.yaml
@@ -13,4 +13,4 @@ kind: Kustomization
 images:
 - name: controller
   newName: quay.io/redhat-cop/namespace-configuration-operator
-  newTag: latest
+  newTag: latest@sha256:d120d6b2c5f26dbc707884381765b3578c70b1790371583b238257a5b5e2588f