diff --git a/Dockerfile b/Dockerfile
index d2aff7a..9c3b377 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 as builder
+FROM golang:1.20@sha256:8f9af7094d0cb27cc783c697ac5ba25efdc4da35f8526db21f7aebb0b0b4f18a 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/ubi8/ubi-minimal
+FROM registry.access.redhat.com/ubi8/ubi-minimal@sha256:de46044c1c8d595193316655c441f196cf885bda9fb97244679b458327c19142
 WORKDIR /
 COPY --from=builder /workspace/manager .
 USER 65532:65532
diff --git a/ci.Dockerfile b/ci.Dockerfile
index 1c17792..8fd077f 100644
--- a/ci.Dockerfile
+++ b/ci.Dockerfile
@@ -1,4 +1,4 @@
-FROM registry.access.redhat.com/ubi8/ubi-minimal
+FROM registry.access.redhat.com/ubi8/ubi-minimal@sha256:de46044c1c8d595193316655c441f196cf885bda9fb97244679b458327c19142
 WORKDIR /
 COPY bin/manager .
 USER 65532:65532
diff --git a/config/manager/kustomization.yaml b/config/manager/kustomization.yaml
index a813e45..f60dfd1 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/cert-utils-operator
-  newTag: latest
+  newTag: latest@sha256:0290e7b2800a5aa8eb57b0268908f2a20a93b16403c76df4c61021048161d6ff