diff --git a/char-benchmark/Main.hs b/char-benchmark/Main.hs
--- a/char-benchmark/Main.hs
+++ b/char-benchmark/Main.hs
@@ -50,16 +50,16 @@
 
 {-# NOINLINE smallInput #-}
 smallInput :: [Int]
-!smallInput =
+smallInput =
   map ord ['a', 'b', 'Ф', '漢', chr 0x11000]
 
 {-# NOINLINE mediumInput #-}
 mediumInput :: [Int]
-!mediumInput =
+mediumInput =
   mconcat (replicate 1000 smallInput)
 
 {-# NOINLINE largeInput #-}
 largeInput :: [Int]
-!largeInput =
+largeInput =
   mconcat (replicate 100000 smallInput)
 
diff --git a/library/Text/Builder.hs b/library/Text/Builder.hs
--- a/library/Text/Builder.hs
+++ b/library/Text/Builder.hs
@@ -52,7 +52,8 @@
       size =
         size1 + size2
 
-instance Semigroup Builder
+instance Semigroup Builder where
+  (<>) = mappend
 
 {-# INLINE char #-}
 char :: Char -> Builder
diff --git a/text-builder.cabal b/text-builder.cabal
--- a/text-builder.cabal
+++ b/text-builder.cabal
@@ -1,7 +1,7 @@
 name:
   text-builder
 version:
-  0.5.1
+  0.5.1.1
 category:
   Text
 synopsis:
@@ -93,7 +93,7 @@
     -- 
     text-builder,
     -- benchmarking:
-    criterion == 1.1.*,
+    criterion >= 1.1 && < 1.5,
     -- general:
     rerebase == 1.*
 
@@ -117,6 +117,6 @@
     -- 
     text-builder,
     -- benchmarking:
-    criterion == 1.1.*,
+    criterion >= 1.1 && < 1.5,
     -- general:
     rerebase == 1.*