diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 99ac2d4..fe46003 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,12 @@
 Release History
 ===============
 
+1.4.0 (unreleased)
+------------------
+
+- Require ``event_hint`` when constructing ``RemoteProtocolError``.
+  This is an API-breaking change.
+
 1.3.2 (2025-11-20)
 ------------------
 
diff --git a/src/wsproto/utilities.py b/src/wsproto/utilities.py
index d02117a..414084c 100644
--- a/src/wsproto/utilities.py
+++ b/src/wsproto/utilities.py
@@ -47,12 +47,15 @@ class RemoteProtocolError(ProtocolError):
 
     .. attribute:: event_hint
 
-       This is a suggested wsproto Event to send to the client based
-       on the error. It could be None if no hint is available.
+       This is the suggested wsproto Event to send to the client based
+       on the error.
+
+    .. versionchanged:: 1.4.0
+       Made ``event_hint`` a required argument.
 
     """
 
-    def __init__(self, message: str, event_hint: Event | None = None) -> None:
+    def __init__(self, message: str, event_hint: Event) -> None:
         self.event_hint = event_hint
         super().__init__(message)