diff --git a/test/configs/zombieAlphanet.json b/test/configs/zombieAlphanet.json
index a5b7366d4fa..ee79f422a2a 100644
--- a/test/configs/zombieAlphanet.json
+++ b/test/configs/zombieAlphanet.json
@@ -46,15 +46,6 @@
       "id": 1000,
       "chain": "moonbase-local",
       "chain_spec_path": "tmp/moonbase-modified-raw-spec.json",
-      "genesis": {
-        "runtimeGenesis": {
-          "patch": {
-            "parachainInfo": {
-              "parachainId": 1000
-            }
-          }
-        }
-      },
       "collator": {
         "name": "alith",
         "ws_port": 33345,
@@ -66,7 +57,7 @@
           "--database=paritydb"
         ]
       }
-    },
+    }
   ],
   "types": {
     "Header": {
diff --git a/test/configs/zombieAlphanetRpc.json b/test/configs/zombieAlphanetRpc.json
index b7fbc7be2d3..9ded9d09830 100644
--- a/test/configs/zombieAlphanetRpc.json
+++ b/test/configs/zombieAlphanetRpc.json
@@ -45,15 +45,6 @@
       "id": 1000,
       "chain": "moonbase-local",
       "chain_spec_path": "tmp/moonbase-modified-raw-spec.json",
-      "genesis": {
-        "runtimeGenesis": {
-          "patch": {
-            "parachainInfo": {
-              "parachainId": 1000
-            }
-          }
-        }
-      },
       "collators": [
         {
           "name": "alith",
diff --git a/test/configs/zombieMoonbeam.json b/test/configs/zombieMoonbeam.json
index 4048c93408a..772fd5f715a 100644
--- a/test/configs/zombieMoonbeam.json
+++ b/test/configs/zombieMoonbeam.json
@@ -44,15 +44,6 @@
       "id": 1000,
       "chain": "moonbeam-local",
       "chain_spec_path": "tmp/moonbeam-modified-raw-spec.json",
-      "genesis": {
-        "runtimeGenesis": {
-          "patch": {
-            "parachainInfo": {
-              "parachainId": 1000
-            }
-          }
-        }
-      },
       "collator": {
         "name": "alith",
         "command": "../target/release/moonbeam",
diff --git a/test/configs/zombieMoonbeamRpc.json b/test/configs/zombieMoonbeamRpc.json
index 201741266a3..4aaf1239e62 100644
--- a/test/configs/zombieMoonbeamRpc.json
+++ b/test/configs/zombieMoonbeamRpc.json
@@ -45,15 +45,6 @@
       "id": 1000,
       "chain": "moonbeam-local",
       "chain_spec_path": "tmp/moonbeam-modified-raw-spec.json",
-      "genesis": {
-        "runtimeGenesis": {
-          "patch": {
-            "parachainInfo": {
-              "parachainId": 1000
-            }
-          }
-        }
-      },
       "collators": [
         {
           "name": "alith",
diff --git a/test/scripts/modify-plain-specs.ts b/test/scripts/modify-plain-specs.ts
index 1e2b6ef6779..3922cf1c1eb 100644
--- a/test/scripts/modify-plain-specs.ts
+++ b/test/scripts/modify-plain-specs.ts
@@ -38,20 +38,16 @@ yargs(hideBin(process.argv))
       process.stdout.write("Done ✅\n");
 
       plainSpec.bootNodes = [];
-      if ("runtimeGenesis" in plainSpec.genesis) {
-        plainSpec.genesis.runtimeGenesis.patch.authorMapping.mappings = [
-          ["5HEL3iLyDyaqmfibHXAXVzyQq4fBqLCHGMEYxZXgRAuhEKXX", ALITH_ADDRESS],
-        ];
+      // TODO: remove once client 0.44.0 is released
+      plainSpec.genesis.runtimeGenesis.patch.parachainInfo.parachainId = 1000;
 
-        plainSpec.genesis.runtimeGenesis.patch.openTechCommitteeCollective.members = [
-          ALITH_ADDRESS,
-        ];
-      } else {
-        plainSpec.genesis.runtime.authorMapping.mappings = [
-          ["5HEL3iLyDyaqmfibHXAXVzyQq4fBqLCHGMEYxZXgRAuhEKXX", ALITH_ADDRESS],
-        ];
-        plainSpec.genesis.runtime.openTechCommitteeCollective.members = [ALITH_ADDRESS];
-      }
+      plainSpec.genesis.runtimeGenesis.patch.authorMapping.mappings = [
+        ["5HEL3iLyDyaqmfibHXAXVzyQq4fBqLCHGMEYxZXgRAuhEKXX", ALITH_ADDRESS],
+      ];
+
+      plainSpec.genesis.runtimeGenesis.patch.openTechCommitteeCollective.members = [
+        ALITH_ADDRESS,
+      ];
 
       process.stdout.write(`Writing to: ${argv.outputPath} ...`);
       await fs.writeFile(