diff --git a/ocaml-gsl.spec b/ocaml-gsl.spec
index d34c1c0..a6318e8 100644
--- a/ocaml-gsl.spec
+++ b/ocaml-gsl.spec
@@ -1,6 +1,6 @@
 Name:           ocaml-gsl
 Version:        1.19.1
-Release:        20%{?dist}
+Release:        21%{?dist}
 Summary:        Interface to GSL (GNU scientific library) for OCaml
 License:        GPLv2
 
@@ -91,6 +91,9 @@ make install
 
 
 %changelog
+* Tue Aug 20 2019 Susi Lehtola <jussilehtola@fedoraproject.org> - 1.19.1-21
+- Rebuilt for GSL 2.6.
+
 * Fri Aug 16 2019 Richard W.M. Jones <rjones@redhat.com> - 1.19.1-20
 - OCaml 4.08.1 (final) rebuild.