diff --git a/predeployed/setup.cfg b/predeployed/setup.cfg
index edca95a..652ab13 100644
--- a/predeployed/setup.cfg
+++ b/predeployed/setup.cfg
@@ -19,7 +19,7 @@ packages = find:
 include_package_data = True
 python_requires = >=3.7
 install_requires =
-    predeployed-generator >= 1.1.0
+    predeployed-generator >= 1.2.0
 
 [options.packages.find]
 where = src
diff --git a/predeployed/src/etherbase_predeployed/etherbase_generator.py b/predeployed/src/etherbase_predeployed/etherbase_generator.py
index e71c96b..9d845d7 100644
--- a/predeployed/src/etherbase_predeployed/etherbase_generator.py
+++ b/predeployed/src/etherbase_predeployed/etherbase_generator.py
@@ -2,7 +2,6 @@
 
 from os.path import dirname, join
 from typing import Dict
-from web3.auto import w3
 
 from predeployed_generator.openzeppelin.access_control_enumerable_generator \
     import AccessControlEnumerableGenerator
@@ -15,7 +14,9 @@ class EtherbaseGenerator(AccessControlEnumerableGenerator):
     ARTIFACT_FILENAME = 'Etherbase.json'
     META_FILENAME = 'Etherbase.meta.json'
     DEFAULT_ADMIN_ROLE = (0).to_bytes(32, 'big')
-    ETHER_MANAGER_ROLE = w3.solidity_keccak(['string'], ['ETHER_MANAGER_ROLE'])
+    ETHER_MANAGER_ROLE = AccessControlEnumerableGenerator.calculate_keccak(
+        ['string'], ['ETHER_MANAGER_ROLE']
+    )
 
     # ---------- storage ----------
     # -----Context------