diff --git a/pkgs/development/python-modules/fastmcp/default.nix b/pkgs/development/python-modules/fastmcp/default.nix
index fcffa502451a..0aa27e46f3a4 100644
--- a/pkgs/development/python-modules/fastmcp/default.nix
+++ b/pkgs/development/python-modules/fastmcp/default.nix
@@ -15,17 +15,21 @@
   exceptiongroup,
   httpx,
   mcp,
+  openai,
   openapi-core,
   openapi-pydantic,
   pydantic,
   pyperclip,
   python-dotenv,
   rich,
+  websockets,
 
   # tests
   dirty-equals,
   email-validator,
   fastapi,
+  inline-snapshot,
+  psutil,
   pytest-asyncio,
   pytest-httpx,
   pytestCheckHook,
@@ -33,14 +37,14 @@
 
 buildPythonPackage rec {
   pname = "fastmcp";
-  version = "2.11.3";
+  version = "2.12.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "jlowin";
     repo = "fastmcp";
     tag = "v${version}";
-    hash = "sha256-jIXrMyNnyPE2DUgg+sxT6LD4dTmKQglh4cFuaw179Z0=";
+    hash = "sha256-d8DOdyoyYDxZOpiUSxsYXnGrgFYN9CjdmAeHmJiDBP0=";
   };
 
   build-system = [
@@ -56,10 +60,17 @@ buildPythonPackage rec {
     mcp
     openapi-core
     openapi-pydantic
+    pydantic
     pyperclip
     python-dotenv
     rich
-  ];
+    websockets
+  ]
+  ++ pydantic.optional-dependencies.email;
+
+  optional-dependencies = {
+    openai = [ openai ];
+  };
 
   pythonImportsCheck = [ "fastmcp" ];
 
@@ -67,25 +78,34 @@ buildPythonPackage rec {
     dirty-equals
     email-validator
     fastapi
-    pydantic
+    inline-snapshot
+    psutil
     pytest-asyncio
     pytest-httpx
     pytestCheckHook
     writableTmpDirAsHomeHook
   ]
-  ++ pydantic.optional-dependencies.email;
+  ++ lib.flatten (lib.attrValues optional-dependencies)
+  ++ inline-snapshot.optional-dependencies.dirty-equals;
 
   disabledTests = [
+    "test_logging_middleware_with_payloads"
+    "test_structured_logging_middleware_produces_json"
+
     # AssertionError: assert 'INFO' == 'DEBUG'
     "test_temporary_settings"
 
-    # RuntimeError: Client failed to connect: Connection close
+    # RuntimeError: Client failed to connect: Connection closed
     "test_keep_alive_maintains_session_across_multiple_calls"
     "test_keep_alive_false_starts_new_session_across_multiple_calls"
+    "test_keep_alive_false_exit_scope_kills_server"
     "test_keep_alive_starts_new_session_if_manually_closed"
+    "test_keep_alive_true_exit_scope_kills_client"
     "test_keep_alive_maintains_session_if_reentered"
     "test_close_session_and_try_to_use_client_raises_error"
+    "test_parallel_calls"
     "test_run_mcp_config"
+    "test_settings_from_environment_issue_1749"
     "test_uv_transport"
     "test_uv_transport_module"
     "test_github_api_schema_performance"