diff --git a/CHANGES b/CHANGES
index 15d479972..6c3c827ae 100644
--- a/CHANGES
+++ b/CHANGES
@@ -32,6 +32,8 @@ Pint Changelog
 - Add `dim_sort` function to _formatter_helpers.
 - Add `dim_order` and `default_sort_func` properties to FullFormatter.
   (PR #1926, fixes Issue #1841)
+- Minimum version requirement added for typing_extensions>=4.0.0.
+  (PR #1996)
 - Documented packages using pint.
   (PR #1960)
 - Fixed bug causing operations between arrays of quantity scalars and quantity holding
diff --git a/requirements.txt b/requirements.txt
index 0bc99005a..dc7cf4651 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 appdirs>=1.4.4
-typing_extensions
+typing_extensions>=4.0.0
 flexcache>=0.3
 flexparser>=0.3