diff --git a/celo/alfajores/rollup.json b/celo/alfajores/rollup.json
index 4a0a5cef..15418759 100644
--- a/celo/alfajores/rollup.json
+++ b/celo/alfajores/rollup.json
@@ -38,6 +38,11 @@
     "da_commitment_type": "GenericCommitment",
     "da_challenge_window": 1,
     "da_resolve_window": 1
+  },
+  "chain_op_config": {
+    "eip1559Elasticity": 5,
+    "eip1559Denominator": 400,
+    "eip1559DenominatorCanyon": 400
   }
 }