diff --git a/Field3D.spec b/Field3D.spec
index 4dbdeef..95d2cfc 100644
--- a/Field3D.spec
+++ b/Field3D.spec
@@ -1,6 +1,6 @@
 Name:           Field3D
 Version:        1.7.3
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Library for storing voxel data
 
 License:        BSD
@@ -70,6 +70,9 @@ pushd build
 
 
 %changelog
+* Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.7.3-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
+
 * Thu Jun 25 2020 Orion Poplawski <orion@cora.nwra.com> - 1.7.3-3
 - Rebuild for hdf5 1.10.6