diff --git a/container-build/cerc-fixturenet-eth-geth/Dockerfile b/container-build/cerc-fixturenet-eth-geth/Dockerfile
index 068291a2..72c03039 100644
--- a/container-build/cerc-fixturenet-eth-geth/Dockerfile
+++ b/container-build/cerc-fixturenet-eth-geth/Dockerfile
@@ -1,4 +1,4 @@
-FROM skylenet/ethereum-genesis-generator AS ethgen
+FROM skylenet/ethereum-genesis-generator@sha256:210353ce7c898686bc5092f16c61220a76d357f51eff9c451e9ad1b9ad03d4d3 AS ethgen
 
 FROM cerc/go-ethereum:local
 RUN apk add --no-cache python3 python3-dev py3-pip curl wget jq build-base gettext libintl openssl bash
diff --git a/container-build/cerc-fixturenet-eth-lighthouse/Dockerfile b/container-build/cerc-fixturenet-eth-lighthouse/Dockerfile
index 08de5537..6e8add4a 100644
--- a/container-build/cerc-fixturenet-eth-lighthouse/Dockerfile
+++ b/container-build/cerc-fixturenet-eth-lighthouse/Dockerfile
@@ -1,5 +1,5 @@
-FROM sigp/lcli AS lcli
-FROM skylenet/ethereum-genesis-generator AS ethgen
+FROM sigp/lcli:v3.2.1 AS lcli
+FROM skylenet/ethereum-genesis-generator@sha256:210353ce7c898686bc5092f16c61220a76d357f51eff9c451e9ad1b9ad03d4d3 AS ethgen
 FROM cerc/fixturenet-eth-geth:local AS fnetgeth
 
 FROM cerc/lighthouse:local
diff --git a/container-build/cerc-lighthouse/Dockerfile b/container-build/cerc-lighthouse/Dockerfile
index 9acefb48..14f0a2ae 100644
--- a/container-build/cerc-lighthouse/Dockerfile
+++ b/container-build/cerc-lighthouse/Dockerfile
@@ -1,4 +1,4 @@
-FROM sigp/lighthouse:latest-modern
+FROM sigp/lighthouse:v3.2.1-modern
 
 RUN apt-get update; apt-get install bash netcat curl less jq -y;