diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -15,6 +15,7 @@
 import qualified Data.Array.Unboxed as A
 import Data.List (sort)
 import Data.Maybe (fromMaybe)
+import Data.Monoid ((<>))
 import Data.List.Split (endBy)
 import System.FilePath.Find
 import "Glob" System.FilePath.Glob
diff --git a/hothasktags.cabal b/hothasktags.cabal
--- a/hothasktags.cabal
+++ b/hothasktags.cabal
@@ -1,5 +1,5 @@
 name: hothasktags
-version: 0.3.7
+version: 0.3.8
 cabal-version: >= 1.6
 build-type: Simple
 author: Luke Palmer <lrpalmer@gmail.com>
@@ -40,7 +40,7 @@
         Glob,
         haskell-src-exts >= 1.17 && < 1.18,
         cpphs >= 1.11 && < 1.21,
-        optparse-applicative,
+        optparse-applicative >= 0.13,
         split
     main-is: Main.hs
     ghc-options: -W