diff --git a/.github/workflows/mypy-type-check.yml b/.github/workflows/mypy-type-check.yml
index 02befe4d4..32e05b217 100644
--- a/.github/workflows/mypy-type-check.yml
+++ b/.github/workflows/mypy-type-check.yml
@@ -50,4 +50,4 @@ jobs:
           tiatoolbox/models/__init__.py \
           tiatoolbox/models/models_abc.py \
           tiatoolbox/models/architecture/__init__.py \
-          tiatoolbox/models/architecture/utils.py \
+          tiatoolbox/models/architecture/utils.py
diff --git a/requirements/requirements_dev.txt b/requirements/requirements_dev.txt
index f4fc21f79..e1a0da1ea 100644
--- a/requirements/requirements_dev.txt
+++ b/requirements/requirements_dev.txt
@@ -2,7 +2,7 @@
 -r ../docs/requirements.txt
 coverage>=7.0.0
 docutils>=0.18.1
-mypy>=1.6.1
+mypy>=1.16
 pip>=22.3
 poetry-bumpversion>=0.3.1
 pre-commit>=2.20.0
diff --git a/tiatoolbox/tools/pyramid.py b/tiatoolbox/tools/pyramid.py
index bacc8edf0..3483a38cb 100644
--- a/tiatoolbox/tools/pyramid.py
+++ b/tiatoolbox/tools/pyramid.py
@@ -17,7 +17,7 @@
 import zipfile
 from io import BytesIO
 from pathlib import Path
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Literal
 
 import defusedxml
 import numpy as np
@@ -352,7 +352,9 @@ def save_tile(tile_path: Path, tile: Image.Image) -> None:
                 )
 
         else:  # container == "tar":
-            compression2mode = {
+            compression2mode: dict[
+                str | None, Literal["w", "w:gz", "w:bz2", "w:xz"]
+            ] = {
                 None: "w",
                 "gzip": "w:gz",
                 "bz2": "w:bz2",
@@ -362,7 +364,9 @@ def save_tile(tile_path: Path, tile: Image.Image) -> None:
                 msg = "Unsupported compression for tar."
                 raise ValueError(msg)
 
-            tar_archive = tarfile.TarFile.open(path, mode=compression2mode[compression])
+            tar_archive = tarfile.TarFile.open(
+                str(path), mode=compression2mode[compression]
+            )
 
             def save_tile(tile_path: Path, tile: Image.Image) -> None:
                 """Write the tile to the output zip."""