1 files changed, 3 insertions, 0 deletions
diff --git a/UPGRADING b/UPGRADING
index 5c3c952ff5..344ff39ea1 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -51,6 +51,9 @@ PHP 7.4 UPGRADE NOTES
 9. Other Changes to Extensions
 ========================================
 
+- Intl:
+  . The Intl extension now requires at least ICU 50.1.
+
 - Reflection:
   . Numeric value of class, property, function and constant modifiers was
     changed. Don't filter methods and properties through