diff --git a/stack-orchestrator/container-build/cerc-fixturenet-eth-genesis-postmerge/Dockerfile b/stack-orchestrator/container-build/cerc-fixturenet-eth-genesis-postmerge/Dockerfile
index 87e5fa9..8832924 100644
--- a/stack-orchestrator/container-build/cerc-fixturenet-eth-genesis-postmerge/Dockerfile
+++ b/stack-orchestrator/container-build/cerc-fixturenet-eth-genesis-postmerge/Dockerfile
@@ -1,6 +1,6 @@
 FROM ethpandaops/ethereum-genesis-generator:3.0.0 AS ethgen
 
-FROM golang:1.20-alpine as builder
+FROM golang:1.21-alpine as builder
 
 RUN apk add --no-cache python3 py3-pip make bash envsubst jq