diff --git a/cmd/grafana-agent-operator/Dockerfile b/cmd/grafana-agent-operator/Dockerfile
index 6090efd5681f..6ba2a6218cd7 100644
--- a/cmd/grafana-agent-operator/Dockerfile
+++ b/cmd/grafana-agent-operator/Dockerfile
@@ -22,7 +22,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
     RELEASE_BUILD=${RELEASE_BUILD} VERSION=${VERSION} \
     make operator
 
-FROM ubuntu:mantic
+FROM public.ecr.aws/ubuntu/ubuntu:mantic
 
 LABEL org.opencontainers.image.source="https://github.com/grafana/agent"
 
diff --git a/cmd/grafana-agent/Dockerfile b/cmd/grafana-agent/Dockerfile
index f602125dfb04..132d1317495c 100644
--- a/cmd/grafana-agent/Dockerfile
+++ b/cmd/grafana-agent/Dockerfile
@@ -30,7 +30,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
     GOEXPERIMENT=${GOEXPERIMENT} \
     make agent
 
-FROM ubuntu:mantic
+FROM public.ecr.aws/ubuntu/ubuntu:mantic
 
 LABEL org.opencontainers.image.source="https://github.com/grafana/agent"
 
diff --git a/cmd/grafana-agentctl/Dockerfile b/cmd/grafana-agentctl/Dockerfile
index 6f601fb7eed2..67fe64c6f3bf 100644
--- a/cmd/grafana-agentctl/Dockerfile
+++ b/cmd/grafana-agentctl/Dockerfile
@@ -23,7 +23,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
     GO_TAGS="netgo promtail_journal_enabled" \
     make agentctl
 
-FROM ubuntu:mantic
+FROM public.ecr.aws/ubuntu/ubuntu:mantic
 
 LABEL org.opencontainers.image.source="https://github.com/grafana/agent"