diff --git a/dvc/parsing/context.py b/dvc/parsing/context.py
index 3d7beeec6..af8d1b3fd 100644
--- a/dvc/parsing/context.py
+++ b/dvc/parsing/context.py
@@ -176,8 +176,9 @@ class Container(Node, ABC):
             return value
         if isinstance(value, (list, dict)):
             assert meta
-            container = CtxDict if isinstance(value, dict) else CtxList
-            return container(value, meta=meta)
+            if isinstance(value, dict):
+                return CtxDict(value, meta=meta)
+            return CtxList(value, meta=meta)
         msg = f"Unsupported value of type '{type(value).__name__}' in '{meta}'"
         raise TypeError(msg)
 
diff --git a/dvc/utils/serialize/_common.py b/dvc/utils/serialize/_common.py
index fde893343..e9eafd513 100644
--- a/dvc/utils/serialize/_common.py
+++ b/dvc/utils/serialize/_common.py
@@ -61,7 +61,7 @@ def _load_data(
 ):
     open_fn = fs.open if fs else open
     encoding = "utf-8"
-    with open_fn(path, encoding=encoding, **kwargs) as fd:  # type: ignore[operator]
+    with open_fn(path, encoding=encoding, **kwargs) as fd:  # type: ignore[arg-type]
         with reraise(UnicodeDecodeError, EncodingError(path, encoding)):
             return parser(fd.read(), path)
 
@@ -74,7 +74,7 @@ def _dump_data(
     **dumper_args,
 ):
     open_fn = fs.open if fs else open
-    with open_fn(path, "w+", encoding="utf-8") as fd:  # type: ignore[operator]
+    with open_fn(path, "w+", encoding="utf-8") as fd:  # type: ignore[call-overload]
         dumper(data, fd, **dumper_args)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index ac5fdfe14..dc36d1f9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,7 +83,7 @@ gdrive = ["dvc-gdrive>=3,<4"]
 gs = ["dvc-gs>=3,<4"]
 hdfs = ["dvc-hdfs>=3,<4"]
 lint = [
-    "mypy==1.11.2",
+    "mypy==1.12.0",
     "pandas-stubs",
     "types-colorama",
     "types-psutil",