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diff --git a/UPGRADING b/UPGRADING
index 768298159d..4e8507b641 100644
--- a/UPGRADING
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@@ -75,6 +75,10 @@ PHP 7.4 UPGRADE NOTES
passed. Previously this would generate a recoverable fatal error on the
next extraction operation.
+- Standard:
+ . The "o" serialization format has been removed. As it is never produced by
+ PHP, this may only break unserialization of manually crafted strings.
+
========================================
2. New Features
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