diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,8 @@
 # CHANGELOG
 
+- 0.9.1.1 (2018-04-26)
+    * Bump `aeson` to 1.3 for tests as well
+
 - 0.9.1.0 (2018-04-26)
     * Support GHC 8.4.1 by adding instance SemiGroup ImportPortion (by George
       Wilson)
diff --git a/stylish-haskell.cabal b/stylish-haskell.cabal
--- a/stylish-haskell.cabal
+++ b/stylish-haskell.cabal
@@ -1,5 +1,5 @@
 Name:          stylish-haskell
-Version:       0.9.1.0
+Version:       0.9.1.1
 Synopsis:      Haskell code prettifier
 Homepage:      https://github.com/jaspervdj/stylish-haskell
 License:       BSD3
@@ -118,7 +118,7 @@
     test-framework       >= 0.4 && < 0.9,
     test-framework-hunit >= 0.2 && < 0.4,
     -- Copied from regular dependencies...
-    aeson            >= 0.6    && < 1.3,
+    aeson            >= 0.6    && < 1.4,
     base             >= 4.8    && < 5,
     bytestring       >= 0.9    && < 0.11,
     containers       >= 0.3    && < 0.6,
diff --git a/tests/Language/Haskell/Stylish/Step/SimpleAlign/Tests.hs b/tests/Language/Haskell/Stylish/Step/SimpleAlign/Tests.hs
--- a/tests/Language/Haskell/Stylish/Step/SimpleAlign/Tests.hs
+++ b/tests/Language/Haskell/Stylish/Step/SimpleAlign/Tests.hs
@@ -25,6 +25,7 @@
     , testCase "case 05" case05
     , testCase "case 06" case06
     , testCase "case 07" case07
+    , testCase "case 08" case08
     ]
 
 
@@ -147,4 +148,21 @@
         , "    { foo :: String"
         , "    , barqux :: Int"
         , "    }"
+        ]
+
+
+--------------------------------------------------------------------------------
+case08 :: Assertion
+case08 = expected @=? testStep (step 80 defaultConfig) input
+  where
+    input = unlines
+        [ "canDrink mbAge = case mbAge of"
+        , "    Just age | age > 18 -> True"
+        , "    _ -> False"
+        ]
+
+    expected = unlines
+        [ "canDrink mbAge = case mbAge of"
+        , "    Just age | age > 18 -> True"
+        , "    _                   -> False"
         ]