diff --git a/hdf.spec b/hdf.spec
index f3f070e..3435fd8 100644
--- a/hdf.spec
+++ b/hdf.spec
@@ -4,7 +4,7 @@
 
 Name: hdf
 Version: 4.2.15
-Release: 3%{?dist}
+Release: 4%{?dist}
 Summary: A general purpose library and file format for storing scientific data
 License: BSD
 URL: https://portal.hdfgroup.org/
@@ -261,6 +261,9 @@ make -j1 -C build-static check
 
 
 %changelog
+* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 4.2.15-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 4.2.15-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild