diff --git a/file-modules.cabal b/file-modules.cabal
--- a/file-modules.cabal
+++ b/file-modules.cabal
@@ -1,5 +1,5 @@
 name: file-modules
-version: 0.1.2.0
+version: 0.1.2.1
 cabal-version: >=1.10
 build-type: Simple
 license: MIT
@@ -39,4 +39,5 @@
         haskell-src-exts >=1.17 && <2
     default-language: Haskell2010
     hs-source-dirs: src
+    ghc-options: -O2 -threaded
 
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -11,7 +11,7 @@
 main = do
     args <- getArgs
     case args of
-      "--version":_ -> putStrLn "0.1.2.0"
+      "--version":_ -> putStrLn "0.1.2.1"
       "--help":_ -> printUsage
       [] -> printUsage >> exitFailure
       ms -> do