diff --git a/python-ws4py.spec b/python-ws4py.spec
index 0a6a4cc..8d5c341 100644
--- a/python-ws4py.spec
+++ b/python-ws4py.spec
@@ -4,7 +4,7 @@ WebSocket client and server library.}
 
 Name:           python-ws4py
 Version:        0.5.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        WebSocket client and server library
 
 # Bundled utf8validator is ASL 2.0 
@@ -53,6 +53,9 @@ Provides:       bundled(utf8validator)
 %{python3} -m pytest
 
 %changelog
+* Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.1-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
+
 * Tue May 26 2020 Miro Hrončok <mhroncok@redhat.com> - 0.5.1-3
 - Rebuilt for Python 3.9