diff --git a/soroban-settings/pubnet_phase4.json b/soroban-settings/pubnet_phase4.json
new file mode 100644
index 0000000000..ddc5fa4619
--- /dev/null
+++ b/soroban-settings/pubnet_phase4.json
@@ -0,0 +1,7 @@
+{
+  "updated_entry": [
+    {
+      "contract_data_key_size_bytes": 250
+    }
+  ]
+}
\ No newline at end of file
diff --git a/soroban-settings/testnet_settings.json b/soroban-settings/testnet_settings.json
index b0f0370e78..011658dd1a 100644
--- a/soroban-settings/testnet_settings.json
+++ b/soroban-settings/testnet_settings.json
@@ -507,7 +507,7 @@
       ]
     },
     {
-      "contract_data_key_size_bytes": 200
+      "contract_data_key_size_bytes": 250
     },
     {
       "contract_data_entry_size_bytes": 65536