diff --git a/CITATION.cff b/CITATION.cff
index 0ee9d86a278..adb6420bff4 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -44,5 +44,5 @@ keywords:
   - hints
   - typing
 license: MIT
-version: v2.11.8
+version: v2.11.9
 date-released: 2025-09-13
diff --git a/HISTORY.md b/HISTORY.md
index 213ff762d48..59a60e6c52c 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,13 @@
+## v2.11.9 (2025-09-13)
+
+[GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.11.9)
+
+### What's Changed
+
+#### Fixes
+
+* Backport v1.10.23 changes by @Viicos
+
 ## v2.11.8 (2025-09-13)
 
 [GitHub release](https://github.com/pydantic/pydantic/releases/tag/v2.11.8)
diff --git a/pydantic/v1/mypy.py b/pydantic/v1/mypy.py
index f4e27ab4b70..79123170a7c 100644
--- a/pydantic/v1/mypy.py
+++ b/pydantic/v1/mypy.py
@@ -863,9 +863,9 @@ def add_method(
         arg_kinds.append(arg.kind)
 
     function_type = ctx.api.named_type(f'{BUILTINS_NAME}.function')
-    signature = CallableType(arg_types, arg_kinds, arg_names, return_type, function_type)
-    if tvar_def:
-        signature.variables = [tvar_def]
+    signature = CallableType(
+        arg_types, arg_kinds, arg_names, return_type, function_type, variables=[tvar_def] if tvar_def else None
+    )
 
     func = FuncDef(name, args, Block([PassStmt()]))
     func.info = info
diff --git a/pydantic/version.py b/pydantic/version.py
index 6208453d735..28d77e9f596 100644
--- a/pydantic/version.py
+++ b/pydantic/version.py
@@ -6,7 +6,7 @@
 
 __all__ = 'VERSION', 'version_info'
 
-VERSION = '2.11.8'
+VERSION = '2.11.9'
 """The version of Pydantic."""