diff --git a/libmat2/bubblewrap.py b/libmat2/bubblewrap.py
index ab6867e..961b76e 100644
--- a/libmat2/bubblewrap.py
+++ b/libmat2/bubblewrap.py
@@ -22,7 +22,7 @@ CalledProcessError = subprocess.CalledProcessError
 # pylint: disable=subprocess-run-check
 
 
-@functools.lru_cache
+@functools.lru_cache(maxsize=None)
 def _get_bwrap_path() -> str:
     which_path = shutil.which('bwrap')
     if which_path:
diff --git a/libmat2/exiftool.py b/libmat2/exiftool.py
index 5979a64..2b91ac2 100644
--- a/libmat2/exiftool.py
+++ b/libmat2/exiftool.py
@@ -67,7 +67,7 @@ class ExiftoolParser(abstract.AbstractParser):
             return False
         return True
 
-@functools.lru_cache
+@functools.lru_cache(maxsize=None)
 def _get_exiftool_path() -> str:  # pragma: no cover
     which_path = shutil.which('exiftool')
     if which_path:
diff --git a/libmat2/video.py b/libmat2/video.py
index 772a89e..39059c5 100644
--- a/libmat2/video.py
+++ b/libmat2/video.py
@@ -135,7 +135,7 @@ class MP4Parser(AbstractFFmpegParser):
     }
 
 
-@functools.lru_cache()
+@functools.lru_cache(maxsize=None)
 def _get_ffmpeg_path() -> str:  # pragma: no cover
     which_path = shutil.which('ffmpeg')
     if which_path: