diff --git a/README.md b/README.md
index 2f22ddd..f429a61 100644
--- a/README.md
+++ b/README.md
@@ -302,6 +302,19 @@ Passing in 0 disables exponential backoff completely. In that case, the client w
 
 
 ## Upgrading
+
+### v93 -> v94
+- An event's chart key can no longer be changed
+
+### v92 -> v93
+- Removed StatusChangeRequest constructor. Use setters instead.
+
+### v91 -> v92
+- No breaking changes.
+
+### v90 -> v91
+- Only PHP 8.1 and newer are supported (older versions have reached end of life).
+
 ### v89 -> v90
 - `$client->usageReports->summaryForAllMonths()` now returns a `UsageSummaryForAllMonths` object