diff --git a/CHANGES.rst b/CHANGES.rst
index 0dd9c9a..8874089 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -14,6 +14,9 @@ Changes
 - Improve documentation on attempt tracking, resets, and customization.
   [aleksihakli]
 
+- Deprecate the old version 4.x ``axes.backends.AxesModelBackend`` class.
+  [aleksihakli]
+
 
 5.0.4 (2019-05-09)
 ------------------
diff --git a/axes/backends.py b/axes/backends.py
index f8376a1..2642e0a 100644
--- a/axes/backends.py
+++ b/axes/backends.py
@@ -52,11 +52,3 @@ class AxesBackend(ModelBackend):
         # in the axes.middleware.AxesMiddleware.process_exception middleware exception handler.
 
         raise AxesBackendPermissionDenied('AxesBackend detected that the given user is locked out')
-
-
-class AxesModelBackend(AxesBackend):
-    """
-    Backwards compatibility class for version 4 to version 5 migration.
-
-    See the ``AxesBackend`` class documentation and implementation.
-    """