diff --git a/setup.py b/setup.py
index 2543121ac..e637ce419 100644
--- a/setup.py
+++ b/setup.py
@@ -27,6 +27,7 @@
 
 general_requirements = [
     'dpath >= 1.5.0, < 3.0.0',
+    'importlib-metadata < 4.3',  # For flake8 4 compatibility
     'nptyping == 1.4.4',
     'numexpr >= 2.7.0, <= 3.0',
     'numpy >= 1.11, < 1.21',