diff --git a/.fern/metadata.json b/.fern/metadata.json
index 543022f4..ceeaa835 100644
--- a/.fern/metadata.json
+++ b/.fern/metadata.json
@@ -11,6 +11,6 @@
       "exported_class_name": "Zep"
     }
   },
-  "originGitCommit": "93a98979696249bf014a0bf648ebf5cb10edffdd",
-  "sdkVersion": "4.0.0a3"
+  "originGitCommit": "6eab49e9f904a487d71c9e469a8b3c63a8e2eb5d",
+  "sdkVersion": "4.0.0a4"
 }
\ No newline at end of file
diff --git a/.fern/replay.lock b/.fern/replay.lock
index 31105e04..c48f2e31 100644
--- a/.fern/replay.lock
+++ b/.fern/replay.lock
@@ -24,5 +24,11 @@ generations:
     cli_version: unknown
     generator_versions:
       fernapi/fern-python-sdk: 4.64.1
-current_generation: 09a01ae94a9a200cca2e9c8056f5453159fcc418
+  - commit_sha: e0584ce4f4a2c870a736d4981e6cc68167b4e13b
+    tree_hash: a06363083d7a9c734c8358691aa9776d6c37a552
+    timestamp: 2026-08-25T16:59:18.677Z
+    cli_version: unknown
+    generator_versions:
+      fernapi/fern-python-sdk: 4.64.1
+current_generation: e0584ce4f4a2c870a736d4981e6cc68167b4e13b
 patches: []
diff --git a/pyproject.toml b/pyproject.toml
index a500743f..287e4f22 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,11 +1,11 @@
 [project]
 name = "zep-cloud"
 dynamic = ["version"]
-version = "4.0.0a3"
+version = "4.0.0a4"
 
 [tool.poetry]
 name = "zep-cloud"
-version = "4.0.0a3"
+version = "4.0.0a4"
 description = ""
 readme = "README.md"
 authors = []
diff --git a/src/zep_cloud/core/client_wrapper.py b/src/zep_cloud/core/client_wrapper.py
index 1393e21b..a5a23988 100644
--- a/src/zep_cloud/core/client_wrapper.py
+++ b/src/zep_cloud/core/client_wrapper.py
@@ -27,12 +27,12 @@ def get_headers(self) -> typing.Dict[str, str]:
         import platform
 
         headers: typing.Dict[str, str] = {
-            "User-Agent": "zep-cloud/4.0.0a3",
+            "User-Agent": "zep-cloud/4.0.0a4",
             "X-Fern-Language": "Python",
             "X-Fern-Runtime": f"python/{platform.python_version()}",
             "X-Fern-Platform": f"{platform.system().lower()}/{platform.release()}",
             "X-Fern-SDK-Name": "zep-cloud",
-            "X-Fern-SDK-Version": "4.0.0a3",
+            "X-Fern-SDK-Version": "4.0.0a4",
             **(self.get_custom_headers() or {}),
         }
         headers["Authorization"] = f"Api-Key {self.api_key}"
diff --git a/src/zep_cloud/types/edge_type.py b/src/zep_cloud/types/edge_type.py
index 92fd1be9..10092bd8 100644
--- a/src/zep_cloud/types/edge_type.py
+++ b/src/zep_cloud/types/edge_type.py
@@ -9,8 +9,8 @@
 
 
 class EdgeType(UniversalBaseModel):
-    description: str
-    name: str
+    description: typing.Optional[str] = None
+    name: typing.Optional[str] = None
     properties: typing.Optional[typing.List[EntityProperty]] = None
     source_targets: typing.Optional[typing.List[EdgeSourceTarget]] = None
 
diff --git a/src/zep_cloud/types/entity_property.py b/src/zep_cloud/types/entity_property.py
index bbc8d568..118be6b1 100644
--- a/src/zep_cloud/types/entity_property.py
+++ b/src/zep_cloud/types/entity_property.py
@@ -8,9 +8,9 @@
 
 
 class EntityProperty(UniversalBaseModel):
-    description: str
-    name: str
-    type: EntityPropertyType
+    description: typing.Optional[str] = None
+    name: typing.Optional[str] = None
+    type: typing.Optional[EntityPropertyType] = None
 
     if IS_PYDANTIC_V2:
         model_config: typing.ClassVar[pydantic.ConfigDict] = pydantic.ConfigDict(extra="allow", frozen=True)  # type: ignore # Pydantic v2
diff --git a/src/zep_cloud/types/entity_property_type.py b/src/zep_cloud/types/entity_property_type.py
index 596fa183..68c0abda 100644
--- a/src/zep_cloud/types/entity_property_type.py
+++ b/src/zep_cloud/types/entity_property_type.py
@@ -2,4 +2,4 @@
 
 import typing
 
-EntityPropertyType = typing.Union[typing.Literal["Text", "Int", "Float", "Boolean"], typing.Any]
+EntityPropertyType = typing.Union[typing.Literal["text", "int", "float", "boolean"], typing.Any]
diff --git a/src/zep_cloud/types/entity_type.py b/src/zep_cloud/types/entity_type.py
index b86cd9dc..313770e8 100644
--- a/src/zep_cloud/types/entity_type.py
+++ b/src/zep_cloud/types/entity_type.py
@@ -8,9 +8,9 @@
 
 
 class EntityType(UniversalBaseModel):
-    description: str
+    description: typing.Optional[str] = None
     identity_properties: typing.Optional[typing.List[str]] = None
-    name: str
+    name: typing.Optional[str] = None
     properties: typing.Optional[typing.List[EntityProperty]] = None
 
     if IS_PYDANTIC_V2: