diff --git a/scat.cabal b/scat.cabal
index 3633e77..e8413e8 100644
--- a/scat.cabal
+++ b/scat.cabal
@@ -70,7 +70,7 @@ executable scat
   build-depends:       base >=4.5 && <5
                      , scrypt == 0.5.*
                      , bytestring
-                     , optparse-applicative >= 0.5 && <0.10
+                     , optparse-applicative >= 0.5
                      , mtl
                      , vector == 0.10.*
                      , ansi-terminal >= 0.6.1
diff --git a/src/Scat/Options.hs b/src/Scat/Options.hs
index a8d7cfb..64da707 100644
--- a/src/Scat/Options.hs
+++ b/src/Scat/Options.hs
@@ -84,7 +84,7 @@ options = Options
         <> metavar "SCHEMA"
         <> value "safe"
         <> showDefault)
-    <*> optional (option
+    <*> optional (option auto
           (short 'n'
         <> long "size"
         <> help "Size parameter"