diff --git a/Tests/test_file_mpo.py b/Tests/test_file_mpo.py
index 682fc7361..6c9c541f1 100644
--- a/Tests/test_file_mpo.py
+++ b/Tests/test_file_mpo.py
@@ -316,7 +316,7 @@ def test_save_xmp() -> None:
     im = Image.new("RGB", (1, 1))
     im2 = Image.new("RGB", (1, 1), "#f00")
 
-    def roundtrip_xmp():
+    def roundtrip_xmp() -> list[Any]:
         im_reloaded = roundtrip(im, xmp=b"Default", save_all=True, append_images=[im2])
         xmp = [im_reloaded.info["xmp"]]
         im_reloaded.seek(1)
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 7b1b575a0..9fc1c7067 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -2600,7 +2600,7 @@ class Image:
         if open_fp:
             fp.close()
 
-    def _attach_default_encoderinfo(self, im: Image) -> Any:
+    def _attach_default_encoderinfo(self, im: Image) -> dict[str, Any]:
         encoderinfo = getattr(self, "encoderinfo", {})
         self.encoderinfo = {**im._default_encoderinfo, **encoderinfo}
         return encoderinfo