diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2edb1ae..7bfbd00 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,3 +4,4 @@
 - Add `Semigroup Element` instance
 
 - r1 (10 Oct 2018): allow `base-4.12`
+- r2 (6 Dec 2019): allow `base-4.13`, `hashable-1.3`, `semigroups-0.19`