diff --git a/CBFlib.spec b/CBFlib.spec
index 2dc8e70..a7e4793 100644
--- a/CBFlib.spec
+++ b/CBFlib.spec
@@ -1,7 +1,7 @@
 Summary: Crystallographic Binary File and Image Library
 Name: CBFlib
 Version: 0.9.5.15
-Release: 3%{?dist}
+Release: 4%{?dist}
 # library files (*.so*) are LGPLv2+, all else is GPLv2+
 License: GPLv2+ and (GPLv2+ or LGPLv2+)
 Group: System Environment/Libraries
@@ -136,6 +136,9 @@ rm -rf %{buildroot}
 %{_includedir}/cbf
 
 %changelog
+* Wed Jul 26 2017 Fedora Release Engineering <releng@fedoraproject.org> - 0.9.5.15-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass_Rebuild
+
 * Sun Feb 05 2017 Kalev Lember <klember@redhat.com> - 0.9.5.15-3
 - Rebuilt for libgfortran soname bump