diff --git a/README.md b/README.md
index c8038df..cda06cc 100644
--- a/README.md
+++ b/README.md
@@ -219,15 +219,20 @@ optimism_package:
         fjord_time_offset: 0
 
         # Granite fork
-        # Defaults to None - not activated - decimal value
+        # Defaults to 0 (genesis activation) - decimal value
         # Offset is in seconds
-        granite_time_offset: ""
+        granite_time_offset: 0
 
         # Holocene fork
         # Defaults to None - not activated - decimal value
         # Offset is in seconds
         holocene_time_offset: ""
 
+        # Isthmus fork
+        # Defaults to None - not activated - decimal value
+        # Offset is in seconds
+        isthmus_time_offset: ""
+
         # Interop fork
         # Defaults to None - not activated - decimal value
         # Offset is in seconds
@@ -254,8 +259,9 @@ optimism_package:
   # L2 contract deployer configuration - used for all L2 networks
   # The docker image that should be used for the L2 contract deployer
   op_contract_deployer_params:
-    image: mslipper/op-deployer:latest
-    artifacts_url: https://storage.googleapis.com/oplabs-contract-artifacts/artifacts-v1-4accd01f0c35c26f24d2aa71aba898dd7e5085a2ce5daadc8a84b10caf113409.tar.gz
+    image: us-docker.pkg.dev/oplabs-tools-artifacts/images/op-deployer:v0.0.6
+    l1_artifacts_locator: tag://op-contracts/v1.6.0
+    l2_artifacts_locator: tag://op-contracts/v1.7.0-beta.1+l2-contracts
 
   # The global log level that all clients should log at
   # Valid values are "error", "warn", "info", "debug", and "trace"
diff --git a/network_params.yaml b/network_params.yaml
index 5aed7bd..eb1d2fa 100644
--- a/network_params.yaml
+++ b/network_params.yaml
@@ -34,17 +34,16 @@ optimism_package:
         seconds_per_slot: 2
         name: "op-kurtosis"
         fjord_time_offset: 0
-        granite_time_offset: ""
-        holocene_time_offset: ""
-        interop_time_offset: ""
+        granite_time_offset: 0
         fund_dev_accounts: true
       batcher_params:
         image: ""
         extra_params: []
       additional_services: []
   op_contract_deployer_params:
-    image: mslipper/op-deployer:latest
-    artifacts_url: https://storage.googleapis.com/oplabs-contract-artifacts/artifacts-v1-4accd01f0c35c26f24d2aa71aba898dd7e5085a2ce5daadc8a84b10caf113409.tar.gz
+    image: us-docker.pkg.dev/oplabs-tools-artifacts/images/op-deployer:v0.0.6
+    l1_artifacts_locator: tag://op-contracts/v1.6.0
+    l2_artifacts_locator: tag://op-contracts/v1.7.0-beta.1+l2-contracts
   global_log_level: "info"
   global_node_selectors: {}
   global_tolerations: []
diff --git a/src/contracts/contract_deployer.star b/src/contracts/contract_deployer.star
index 19097d8..c93c2f9 100644
--- a/src/contracts/contract_deployer.star
+++ b/src/contracts/contract_deployer.star
@@ -40,12 +40,36 @@ def deploy_contracts(
         ),
     )
 
+    hardfork_schedule = []
+    for index, chain in enumerate(optimism_args.chains):
+        np = chain.network_params
+
+        # rename each hardfork to the name the override expects
+        renames = (
+            ("l2GenesisFjordTimeOffset", np.fjord_time_offset),
+            ("l2GenesisGraniteTimeOffset", np.granite_time_offset),
+            ("l2GenesisHoloceneTimeOffset", np.holocene_time_offset),
+            ("l2GenesisIsthmusTimeOffset", np.isthmus_time_offset),
+            ("l2GenesisInteropTimeOffset", np.interop_time_offset),
+        )
+
+        # only include the hardforks that have been activated since
+        # toml does not support null values
+        for fork_key, activation_timestamp in renames:
+            if activation_timestamp != None:
+                hardfork_schedule.append((index, fork_key, activation_timestamp))
+
     intent_updates = (
         [
             (
                 "string",
-                "contractArtifactsURL",
-                optimism_args.op_contract_deployer_params.artifacts_url,
+                "l1ContractsLocator",
+                optimism_args.op_contract_deployer_params.l1_artifacts_locator,
+            ),
+            (
+                "string",
+                "l2ContractsLocator",
+                optimism_args.op_contract_deployer_params.l2_artifacts_locator,
             ),
         ]
         + [
@@ -64,6 +88,14 @@ def deploy_contracts(
             )
             for index, chain in enumerate(optimism_args.chains)
         ]
+        + [
+            (
+                "string",
+                "chains.[{0}].deployOverrides.{1}".format(index, fork_key),
+                "0x%x" % activation_timestamp,
+            )
+            for index, fork_key, activation_timestamp in hardfork_schedule
+        ]
     )
 
     op_deployer_configure = plan.run_sh(
diff --git a/src/package_io/input_parser.star b/src/package_io/input_parser.star
index 78a8116..dba6a1d 100644
--- a/src/package_io/input_parser.star
+++ b/src/package_io/input_parser.star
@@ -80,6 +80,7 @@ def input_parser(plan, input_args):
                     holocene_time_offset=result["network_params"][
                         "holocene_time_offset"
                     ],
+                    isthmus_time_offset=result["network_params"]["isthmus_time_offset"],
                     interop_time_offset=result["network_params"]["interop_time_offset"],
                     fund_dev_accounts=result["network_params"]["fund_dev_accounts"],
                 ),
@@ -93,7 +94,12 @@ def input_parser(plan, input_args):
         ],
         op_contract_deployer_params=struct(
             image=results["op_contract_deployer_params"]["image"],
-            artifacts_url=results["op_contract_deployer_params"]["artifacts_url"],
+            l1_artifacts_locator=results["op_contract_deployer_params"][
+                "l1_artifacts_locator"
+            ],
+            l2_artifacts_locator=results["op_contract_deployer_params"][
+                "l2_artifacts_locator"
+            ],
         ),
         global_log_level=results["global_log_level"],
         global_node_selectors=results["global_node_selectors"],
@@ -208,8 +214,9 @@ def default_network_params():
         "name": "op-kurtosis",
         "seconds_per_slot": 2,
         "fjord_time_offset": 0,
-        "granite_time_offset": None,
+        "granite_time_offset": 0,
         "holocene_time_offset": None,
+        "isthmus_time_offset": None,
         "interop_time_offset": None,
         "fund_dev_accounts": True,
     }
@@ -256,8 +263,9 @@ def default_participant():
 
 def default_op_contract_deployer_params():
     return {
-        "image": "mslipper/op-deployer:latest",
-        "artifacts_url": "https://storage.googleapis.com/oplabs-contract-artifacts/artifacts-v1-4accd01f0c35c26f24d2aa71aba898dd7e5085a2ce5daadc8a84b10caf113409.tar.gz",
+        "image": "us-docker.pkg.dev/oplabs-tools-artifacts/images/op-deployer:v0.0.6",
+        "l1_artifacts_locator": "tag://op-contracts/v1.6.0",
+        "l2_artifacts_locator": "tag://op-contracts/v1.7.0-beta.1+l2-contracts",
     }
 
 
diff --git a/src/package_io/sanity_check.star b/src/package_io/sanity_check.star
index 33fedb1..3055cd6 100644
--- a/src/package_io/sanity_check.star
+++ b/src/package_io/sanity_check.star
@@ -39,6 +39,7 @@ SUBCATEGORY_PARAMS = {
         "fjord_time_offset",
         "granite_time_offset",
         "holocene_time_offset",
+        "isthmus_time_offset",
         "interop_time_offset",
         "fund_dev_accounts",
     ],
@@ -47,7 +48,8 @@ SUBCATEGORY_PARAMS = {
 
 OP_CONTRACT_DEPLOYER_PARAMS = [
     "image",
-    "artifacts_url",
+    "l1_artifacts_locator",
+    "l2_artifacts_locator",
 ]
 
 ADDITIONAL_SERVICES_PARAMS = [