diff --git a/iso18245/__init__.py b/iso18245/__init__.py
index fba5edf..d32d693 100644
--- a/iso18245/__init__.py
+++ b/iso18245/__init__.py
@@ -1,8 +1,7 @@
 import csv
-import os.path
-from typing import Any, Dict, List, NamedTuple
+from typing import Dict, List, NamedTuple
 
-from pkg_resources import resource_filename
+from importlib_resources import files
 
 ISO_VERSION_YEAR = 2003
 
@@ -41,13 +40,13 @@ class MCC(NamedTuple):
 
 
 def _load_csv(path: str) -> List[List[str]]:
-	if path not in _cached_csv:
-		full_path = resource_filename("iso18245", os.path.join("data", path))
-		with open(full_path, "r") as f:
-			reader = csv.reader(f)
-			_cached_csv[path] = list(reader)[1:]
+    if path not in _cached_csv:
+        ref = files("iso18245") / "data" / path
+        with ref.open("r") as f:
+            reader = csv.reader(f)
+            _cached_csv[path] = list(reader)[1:]
 
-	return _cached_csv[path]
+    return _cached_csv[path]
 
 
 def _find_mcc_in_csv(mcc: str, path: str) -> List[str]:
diff --git a/pyproject.toml b/pyproject.toml
index 5ae69cd..a2a1167 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.8"
+importlib_resources = "^5.4.0"
 
 [tool.poetry.group.dev.dependencies]
 mypy = "^1.2.0"