diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Unreleased changes
 
+## v0.1.0.1
+- Enables older GHC versions for Travis
+
 ## v0.1.0.0
 
 - Initial release.
diff --git a/focuslist.cabal b/focuslist.cabal
--- a/focuslist.cabal
+++ b/focuslist.cabal
@@ -1,5 +1,5 @@
 name:                focuslist
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Lists with a focused element
 description:         Please see <https://github.com/cdepillabout/focuslist#readme README.md>.
 homepage:            https://github.com/cdepillabout/focuslist
@@ -29,8 +29,8 @@
 library
   hs-source-dirs:      src
   exposed-modules:     Data.FocusList
-  build-depends:       base >= 4.7 && < 5
-                     , containers
+  build-depends:       base >= 4.9 && < 5
+                     , containers >= 0.5.8
                      , lens
                      , mono-traversable
                      , QuickCheck
diff --git a/src/Data/FocusList.hs b/src/Data/FocusList.hs
--- a/src/Data/FocusList.hs
+++ b/src/Data/FocusList.hs
@@ -78,6 +78,7 @@
 import Data.Function ((&))
 import Data.MonoTraversable
   (Element, GrowingAppend, MonoFoldable, MonoFunctor, MonoTraversable, olength)
+import Data.Semigroup ((<>))
 import qualified Data.Sequence as Sequence
 import Data.Sequence
   (Seq((:<|), Empty), (<|), deleteAt, elemIndexL, insertAt, singleton)
diff --git a/test/Test/FocusList/Invariants.hs b/test/Test/FocusList/Invariants.hs
--- a/test/Test/FocusList/Invariants.hs
+++ b/test/Test/FocusList/Invariants.hs
@@ -2,6 +2,7 @@
 module Test.FocusList.Invariants where
 
 import Data.Maybe (catMaybes)
+import Data.Semigroup ((<>))
 import Hedgehog
   ( Gen
   , Property