diff --git a/.github/workflows/local-testnet.yml b/.github/workflows/local-testnet.yml
index b79659ae3bd..dfdb2a8101d 100644
--- a/.github/workflows/local-testnet.yml
+++ b/.github/workflows/local-testnet.yml
@@ -220,7 +220,7 @@ jobs:
     needs: dockerfile-ubuntu
     strategy:
       matrix:
-        fork: [electra, fulu]
+        fork: [fulu, gloas]
         offline_secs: [120, 300]
     steps:
       - uses: actions/checkout@v5
diff --git a/scripts/tests/genesis-sync-config-electra.yaml b/scripts/tests/genesis-sync-config-gloas.yaml
similarity index 64%
rename from scripts/tests/genesis-sync-config-electra.yaml
rename to scripts/tests/genesis-sync-config-gloas.yaml
index 0e41a5d1655..ffad0a05b23 100644
--- a/scripts/tests/genesis-sync-config-electra.yaml
+++ b/scripts/tests/genesis-sync-config-gloas.yaml
@@ -2,19 +2,24 @@
 participants:
   - cl_type: lighthouse
     cl_image: lighthouse:local
+    el_type: geth
+    el_image: ethpandaops/geth:glamsterdam-devnet-0
     count: 2
   # nodes without validators, used for testing sync.
   - cl_type: lighthouse
     cl_image: lighthouse:local
+    el_type: geth
+    el_image: ethpandaops/geth:glamsterdam-devnet-0
     validator_count: 0
   - cl_type: lighthouse
     cl_image: lighthouse:local
+    el_type: geth
+    el_image: ethpandaops/geth:glamsterdam-devnet-0
     validator_count: 0
 network_params:
+  gloas_fork_epoch: 0
   slot_duration_ms: 6000
-  electra_fork_epoch: 0
-  fulu_fork_epoch: 100000 # a really big number so this test stays in electra
-  preset: "minimal"
+  preset: "mainnet"
 additional_services:
   - tx_fuzz
   - spamoor
diff --git a/scripts/tests/genesis-sync.sh b/scripts/tests/genesis-sync.sh
index 39628c9e73c..daac60eb613 100755
--- a/scripts/tests/genesis-sync.sh
+++ b/scripts/tests/genesis-sync.sh
@@ -7,7 +7,7 @@
 SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 
 ENCLAVE_NAME=${1:-genesis-sync-testnet}
-CONFIG=${2:-$SCRIPT_DIR/genesis-sync-config-electra.yaml}
+CONFIG=${2:-$SCRIPT_DIR/genesis-sync-config-fulu.yaml}
 FORK_TYPE=${3:-electra}  # electra or fulu
 OFFLINE_DURATION_SECS=${4:-120} # stopped duration  of non validating nodes