diff --git a/ocaml-pgocaml.spec b/ocaml-pgocaml.spec
index c0b78e3..b3cb5f7 100644
--- a/ocaml-pgocaml.spec
+++ b/ocaml-pgocaml.spec
@@ -6,7 +6,7 @@
 
 Name:           ocaml-pgocaml
 Version:        1.6
-Release:        19%{?dist}
+Release:        20%{?dist}
 Summary:        OCaml library for type-safe access to PostgreSQL databases
 License:        LGPLv2+ with exceptions
 
@@ -99,6 +99,10 @@ install -m 0755 pgocaml_prof $RPM_BUILD_ROOT%{_bindir}
 
 
 %changelog
+* Tue Nov 15 2016 Richard W.M. Jones <rjones@redhat.com> - 1.6-20
+- Bump and rebuild.
+  [pgocaml and calendarLib] make inconsistent assumptions over implementation CalendarLib.
+
 * Mon Nov 07 2016 Richard W.M. Jones <rjones@redhat.com> - 1.6-19
 - Rebuild for OCaml 4.04.0.