diff --git a/python/publish/junit.py b/python/publish/junit.py
index 50aaa061..1c950820 100644
--- a/python/publish/junit.py
+++ b/python/publish/junit.py
@@ -1,6 +1,6 @@
 import os
 from collections import defaultdict
-from typing import Optional, Iterable, Union, Any, List, Dict, Callable, TypeVar
+from typing import Optional, Iterable, Union, Any, List, Dict, Callable, Tuple
 
 import junitparser
 from junitparser import Element, JUnitXml, TestCase, TestSuite, Skipped
@@ -98,13 +98,10 @@ def end(self, tag: Union[str, bytes]) -> Element:
                 self._stack.pop()
 
 
-T = TypeVar("T")
-
-
 def parse_junit_xml_files(files: Iterable[str],
                           time_factor: float = 1.0,
                           drop_testcases: bool = False,
-                          progress: Callable[[T], T] = lambda x: x) -> ParsedUnitTestResults:
+                          progress: Callable[[Tuple[str, Any]], Tuple[str, Any]] = lambda x: x) -> ParsedUnitTestResults:
     """Parses junit xml files and returns aggregated statistics as a ParsedUnitTestResults."""
     def parse(path: str) -> Union[str, Any]:
         if not os.path.exists(path):
diff --git a/python/publish/progress.py b/python/publish/progress.py
index d4d78c5f..c2c51a29 100644
--- a/python/publish/progress.py
+++ b/python/publish/progress.py
@@ -1,7 +1,7 @@
 from datetime import datetime
 from logging import Logger
 from threading import Timer
-from typing import Generic, TypeVar, Optional, Callable
+from typing import Generic, TypeVar, Optional, Callable, Type, Any
 import contextlib
 
 import humanize
@@ -14,8 +14,9 @@ def progress_logger(items: int,
                     interval_seconds: int,
                     progress_template: str,
                     finish_template: Optional[str],
-                    logger: Logger) -> Callable[[T], T]:
-    progress = Progress(items)
+                    logger: Logger,
+                    progress_item_type: Type[T] = Any) -> Callable[[T], T]:
+    progress = Progress[progress_item_type](items)
     plogger = ProgressLogger(progress, interval_seconds, progress_template, logger).start()
     try:
         yield progress.observe
diff --git a/python/publish_unit_test_results.py b/python/publish_unit_test_results.py
index a4ff8ee8..b8d26ca2 100644
--- a/python/publish_unit_test_results.py
+++ b/python/publish_unit_test_results.py
@@ -6,7 +6,7 @@
 from collections import defaultdict
 from datetime import datetime
 from glob import glob
-from typing import List, Optional, Union
+from typing import List, Optional, Union, Tuple, Any
 
 import github
 import humanize
@@ -108,6 +108,7 @@ def main(settings: Settings, gha: GithubAction) -> None:
                          interval_seconds=10,
                          progress_template='Read {progress} files in {time}',
                          finish_template='Finished reading {observations} files in {duration}',
+                         progress_item_type=Tuple[str, Any],
                          logger=logger) as progress:
         # get the unit test results
         parsed = parse_junit_xml_files(files, settings.time_factor, settings.ignore_runs, progress).with_commit(settings.commit)