diff --git a/wagtail/utils/deprecation.py b/wagtail/utils/deprecation.py
index 68f0ca3a5..e3547807d 100644
--- a/wagtail/utils/deprecation.py
+++ b/wagtail/utils/deprecation.py
@@ -1,10 +1,10 @@
 
-class RemovedInWagtail21Warning(DeprecationWarning):
+class RemovedInWagtail22Warning(DeprecationWarning):
     pass
 
 
-removed_in_next_version_warning = RemovedInWagtail21Warning
+removed_in_next_version_warning = RemovedInWagtail22Warning
 
 
-class RemovedInWagtail22Warning(PendingDeprecationWarning):
+class RemovedInWagtail23Warning(PendingDeprecationWarning):
     pass