diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### 0.1.2.1
+
+- Added support for semigroups-0.18.
+
 ## 0.1.2
 
 - Added support for semigroups-0.17.
diff --git a/event.cabal b/event.cabal
--- a/event.cabal
+++ b/event.cabal
@@ -1,5 +1,5 @@
 name:                event
-version:             0.1.2
+version:             0.1.2.1
 synopsis:            Monoidal, monadic and first-class events
 description:         This package can be used to represent events as
                      first-class objects instead of deepening callbacks and
@@ -29,7 +29,7 @@
   build-depends:       base         >= 4.8  && < 4.9
                      , transformers >= 0.4  && < 0.5
                      , containers   >= 0.5  && < 0.6
-                     , semigroups   >= 0.16 && < 0.18
+                     , semigroups   >= 0.16 && < 0.19
 
   hs-source-dirs:      src