diff --git a/pkgs/development/python-modules/sse-starlette/default.nix b/pkgs/development/python-modules/sse-starlette/default.nix
index 745ec3a2ce79f..0a5708af8604f 100644
--- a/pkgs/development/python-modules/sse-starlette/default.nix
+++ b/pkgs/development/python-modules/sse-starlette/default.nix
@@ -12,6 +12,7 @@
   httpx,
   portend,
   psutil,
+  pydantic,
   pytest-asyncio,
   pytestCheckHook,
   setuptools,
@@ -22,32 +23,35 @@
   uvicorn,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "sse-starlette";
-  version = "3.2.0";
+  version = "3.4.5";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "sysid";
     repo = "sse-starlette";
-    tag = "v${version}";
-    hash = "sha256-SqYLwbl+AyeqgYIwAd/Z39BSPXaYSXMnM6DAGUv3vQ8=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-b0iNu9CN4Tca2hGU0Rpr/v0Q4KWNPQNCp9BY5YnzjzA=";
   };
 
   build-system = [ setuptools ];
 
   dependencies = [
     anyio
+    starlette
   ];
 
   optional-dependencies = {
     daphne = [ daphne ];
     examples = [
-      aiosqlite
       fastapi
-      sqlalchemy
-      starlette
+      pydantic
       uvicorn
+    ];
+    examples_db = [
+      aiosqlite
+      sqlalchemy
     ]
     ++ sqlalchemy.optional-dependencies.asyncio;
     granian = [ granian ];
@@ -82,8 +86,8 @@ buildPythonPackage rec {
   meta = {
     description = "Server Sent Events for Starlette and FastAPI";
     homepage = "https://github.com/sysid/sse-starlette";
-    changelog = "https://github.com/sysid/sse-starlette/blob/${src.tag}/CHANGELOG.md";
+    changelog = "https://github.com/sysid/sse-starlette/blob/${finalAttrs.src.tag}/CHANGELOG.md";
     license = lib.licenses.bsd3;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})