diff --git a/package-lock.json b/package-lock.json
index ff95a2e..54de58c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,9 +6,9 @@
     "": {
       "name": "@seamapi/python",
       "devDependencies": {
-        "@seamapi/fake-seam-connect": "1.83.1",
+        "@seamapi/fake-seam-connect": "1.83.2",
         "@seamapi/nextlove-sdk-generator": "^1.18.1",
-        "@seamapi/types": "1.418.1",
+        "@seamapi/types": "1.420.2",
         "del": "^7.1.0",
         "prettier": "^3.2.5"
       }
@@ -434,9 +434,9 @@
       }
     },
     "node_modules/@seamapi/fake-seam-connect": {
-      "version": "1.83.1",
-      "resolved": "https://registry.npmjs.org/@seamapi/fake-seam-connect/-/fake-seam-connect-1.83.1.tgz",
-      "integrity": "sha512-LnVM8EL9G0UBRSKjKiZCvJaoIHC87GKf/QeLqofBQswOrKVI1LxdHIqbYMgsSZWFly1HPFBYZh0jdTh84b4Jgw==",
+      "version": "1.83.2",
+      "resolved": "https://registry.npmjs.org/@seamapi/fake-seam-connect/-/fake-seam-connect-1.83.2.tgz",
+      "integrity": "sha512-8WzPugS3bWh9avnC5a7dT1yeh+PUB9gBJHx0bRmJsZWjS7OUHR53U0FVAJ/p/x3MXHbF6QISpiZ/C/M0coXDBA==",
       "dev": true,
       "license": "MIT",
       "bin": {
@@ -475,9 +475,9 @@
       }
     },
     "node_modules/@seamapi/types": {
-      "version": "1.418.1",
-      "resolved": "https://registry.npmjs.org/@seamapi/types/-/types-1.418.1.tgz",
-      "integrity": "sha512-BaxESv5sNtn3rHvQpSOjGGlCweLdE+rgDCSMfQ1Og5h0LN31jTTo9ZSFkFilYLBB0ihrH2g6Xo6Q+E3eKNHrCA==",
+      "version": "1.420.2",
+      "resolved": "https://registry.npmjs.org/@seamapi/types/-/types-1.420.2.tgz",
+      "integrity": "sha512-3W6YwDWIUsfwvEzzF6HuDNryqSqtywoGvi+zfLf9Js/wh88A3DKXYOmwamGWLus2L6vTp28F4aipcu5uNQndow==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index c65eb5f..44bf5e6 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,9 @@
     "start": "fake-seam-connect --seed"
   },
   "devDependencies": {
-    "@seamapi/fake-seam-connect": "1.83.1",
+    "@seamapi/fake-seam-connect": "1.83.2",
     "@seamapi/nextlove-sdk-generator": "^1.18.1",
-    "@seamapi/types": "1.418.1",
+    "@seamapi/types": "1.420.2",
     "del": "^7.1.0",
     "prettier": "^3.2.5"
   }
diff --git a/seam/routes/access_grants.py b/seam/routes/access_grants.py
index ecb1fe0..c3e341e 100644
--- a/seam/routes/access_grants.py
+++ b/seam/routes/access_grants.py
@@ -94,3 +94,23 @@ def list(
         res = self.client.post("/access_grants/list", json=json_payload)
 
         return [AccessGrant.from_dict(item) for item in res["access_grants"]]
+
+    def update(
+        self,
+        *,
+        access_grant_id: str,
+        ends_at: Optional[str] = None,
+        starts_at: Optional[str] = None
+    ) -> None:
+        json_payload = {}
+
+        if access_grant_id is not None:
+            json_payload["access_grant_id"] = access_grant_id
+        if ends_at is not None:
+            json_payload["ends_at"] = ends_at
+        if starts_at is not None:
+            json_payload["starts_at"] = starts_at
+
+        self.client.post("/access_grants/update", json=json_payload)
+
+        return None
diff --git a/seam/routes/models.py b/seam/routes/models.py
index 37309a0..7f8d4ff 100644
--- a/seam/routes/models.py
+++ b/seam/routes/models.py
@@ -68,9 +68,11 @@ class AccessGrant:
     access_method_ids: List[str]
     created_at: str
     display_name: str
+    ends_at: str
     location_ids: List[str]
     requested_access_methods: List[Dict[str, Any]]
     space_ids: List[str]
+    starts_at: str
     user_identity_id: str
     workspace_id: str
 
@@ -81,9 +83,11 @@ def from_dict(d: Dict[str, Any]):
             access_method_ids=d.get("access_method_ids", None),
             created_at=d.get("created_at", None),
             display_name=d.get("display_name", None),
+            ends_at=d.get("ends_at", None),
             location_ids=d.get("location_ids", None),
             requested_access_methods=d.get("requested_access_methods", None),
             space_ids=d.get("space_ids", None),
+            starts_at=d.get("starts_at", None),
             user_identity_id=d.get("user_identity_id", None),
             workspace_id=d.get("workspace_id", None),
         )
@@ -1559,6 +1563,16 @@ def list(
     ) -> List[AccessGrant]:
         raise NotImplementedError()
 
+    @abc.abstractmethod
+    def update(
+        self,
+        *,
+        access_grant_id: str,
+        ends_at: Optional[str] = None,
+        starts_at: Optional[str] = None
+    ) -> None:
+        raise NotImplementedError()
+
 
 class AbstractAccessMethods(abc.ABC):