diff --git a/Crashlytics/CHANGELOG.md b/Crashlytics/CHANGELOG.md
index b676e2e1801..71229d3753c 100644
--- a/Crashlytics/CHANGELOG.md
+++ b/Crashlytics/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Unreleased
+- [changed] Updated `upload-symbols` to version 3.21, updated error logging in
+  `upload-symbols` and started reading the `DEVELOPER_DIR` environment
+  variable for the path to Xcode for CoreSymbolication (#15896).
+
 # 12.11.0
 - [fixed] Fixed an issue where Crashlytics API calls were silently dropped if invoked immediately after Firebase initialization.
 
diff --git a/Crashlytics/upload-symbols b/Crashlytics/upload-symbols
index 4c3f8258b9c..6ac5ec0e48e 100755
Binary files a/Crashlytics/upload-symbols and b/Crashlytics/upload-symbols differ