diff --git a/stack-orchestrator/stacks/fixturenet-eth/stack.yml b/stack-orchestrator/stacks/fixturenet-eth/stack.yml
index d36a6c9..84176de 100644
--- a/stack-orchestrator/stacks/fixturenet-eth/stack.yml
+++ b/stack-orchestrator/stacks/fixturenet-eth/stack.yml
@@ -2,7 +2,7 @@ version: "1.1"
 name: fixturenet-eth
 description: "Ethereum Fixturenet"
 repos:
-  - git.vdb.to/cerc-io/lighthouse
+  - git.vdb.to/cerc-io/lighthouse@testnet-genesis-eth1-withdrawal-creds
 containers:
   - cerc/lighthouse
   - cerc/lighthouse-cli
diff --git a/stack-orchestrator/stacks/fixturenet-plugeth/stack.yml b/stack-orchestrator/stacks/fixturenet-plugeth/stack.yml
index ef1119f..f5c4b55 100644
--- a/stack-orchestrator/stacks/fixturenet-plugeth/stack.yml
+++ b/stack-orchestrator/stacks/fixturenet-plugeth/stack.yml
@@ -4,7 +4,7 @@ description: "Plugeth Ethereum Indexing Fixturenet"
 repos:
   - git.vdb.to/cerc-io/plugeth@statediff
   - git.vdb.to/cerc-io/plugeth-statediff
-  - git.vdb.to/cerc-io/lighthouse
+  - git.vdb.to/cerc-io/lighthouse@testnet-genesis-eth1-withdrawal-creds
   - git.vdb.to/cerc-io/ipld-eth-db
 containers:
   - cerc/plugeth-statediff