diff --git a/scat.cabal b/scat.cabal
index 0e94fe6..b4e5f18 100644
--- a/scat.cabal
+++ b/scat.cabal
@@ -72,7 +72,7 @@ executable scat
                      , bytestring
                      , optparse-applicative >= 0.5
                      , mtl
-                     , vector == 0.12.*
+                     , vector == 0.13.*
                      , ansi-terminal >= 0.6.1
 
 test-suite scat-tests
@@ -84,5 +84,5 @@ test-suite scat-tests
                      , bytestring
                      , optparse-applicative >= 0.5
                      , mtl
-                     , vector == 0.12.*
+                     , vector == 0.13.*
                      , ansi-terminal >= 0.6.1
diff --git a/src/Main.hs b/src/Main.hs
index 49837ba..7f0236e 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -9,6 +9,7 @@ import System.IO
 import System.Exit
 import System.Console.ANSI
 import Control.Exception
+import Control.Monad (when, unless)
 import Control.Monad.Reader
 
 import Scat