diff --git a/hjsmin.cabal b/hjsmin.cabal
--- a/hjsmin.cabal
+++ b/hjsmin.cabal
@@ -1,5 +1,5 @@
 name:            hjsmin
-version:         0.1.5.3
+version:         0.1.5.4
 license:         BSD3
 license-file:    LICENSE
 author:          Alan Zimmerman <alan.zimm@gmail.com>
@@ -42,8 +42,8 @@
                  , blaze-builder        >= 0.2
                  , text                 >= 0.8
                  , containers           >= 0.2
-                 , language-javascript  >= 0.5.14
-                 , optparse-applicative >= 0.7
+                 , language-javascript  >= 0.5.14  && < 0.6
+                 , optparse-applicative == 0.13.*
 
 Test-Suite test-hjsmin
   Type: exitcode-stdio-1.0
diff --git a/hjsmin.hs b/hjsmin.hs
--- a/hjsmin.hs
+++ b/hjsmin.hs
@@ -1,5 +1,6 @@
 module Main where
 
+import Data.Monoid ((<>))
 import Options.Applicative
 import Text.Jasmine