diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,6 @@
+# Changes in version 0.12.1.1
+ * add semigrioups dep to test suite so CI actually runs again on GHC < 8
+
 # Changes in version 0.12.1.0
  * Fix integer overflows in specializations of Bundle/Stream enumFromTo on Integral types
  * Fix possibility of OutOfMemory with `take` and very large arguments.
diff --git a/tests/Tests/Vector/Property.hs b/tests/Tests/Vector/Property.hs
--- a/tests/Tests/Vector/Property.hs
+++ b/tests/Tests/Vector/Property.hs
@@ -42,6 +42,7 @@
 import Text.Show.Functions ()
 import Data.List
 
+import Data.Monoid
 
 import qualified Control.Applicative as Applicative
 import System.Random       (Random)
@@ -522,7 +523,7 @@
    'prop_minIndex, 'prop_maxIndex,
    'prop_maximumBy, 'prop_minimumBy,
    'prop_maxIndexBy, 'prop_minIndexBy,
-   'prop_ListLastMaxIndexWins ])
+   'prop_ListLastMaxIndexWins, 'prop_FalseListFirstMaxIndexWins ])
   where
     prop_compare :: P (v a -> v a -> Ordering) = compare `eq` compare
     prop_maximum :: P (v a -> a) = not . V.null ===> V.maximum `eq` maximum
diff --git a/vector.cabal b/vector.cabal
--- a/vector.cabal
+++ b/vector.cabal
@@ -1,5 +1,5 @@
 Name:           vector
-Version:        0.12.1.0
+Version:        0.12.1.1
 -- don't forget to update the changelog file!
 License:        BSD3
 License-File:   LICENSE
@@ -205,7 +205,7 @@
                  primitive, random,
                  QuickCheck >= 2.9 && < 2.14 , HUnit, tasty,
                  tasty-hunit, tasty-quickcheck,
-                 transformers >= 0.2.0.0
+                 transformers >= 0.2.0.0,semigroups
 
   default-extensions: CPP,
               ScopedTypeVariables,
@@ -248,7 +248,7 @@
                  primitive, random,
                  QuickCheck >= 2.9 && < 2.14 , HUnit,  tasty,
                  tasty-hunit, tasty-quickcheck,
-                 transformers >= 0.2.0.0
+                 transformers >= 0.2.0.0,semigroups
 
   default-extensions: CPP,
               ScopedTypeVariables,