diff --git a/ips.cabal b/ips.cabal
index 7972c27..4b8ba1f 100644
--- a/ips.cabal
+++ b/ips.cabal
@@ -12,7 +12,7 @@ bug-reports: https://git.rhiannon.website/rhi/ips/issues
 
 source-repository head
   type: git
-  location: https://git.rhiannon.website/rhi/ips.git
+  location: git://git.rhiannon.website/rhi/ips.git
 
 common deps
   default-language: Haskell2010
@@ -24,11 +24,11 @@ common deps
     NamedFieldPuns,
     OverloadedStrings
   build-depends:
-    base       >= 4.14.1.0 && < 4.22,
-    bytestring >= 0.11.1.0 && < 0.13,
-    vector     >= 0.12.2.0 && < 0.14,
-    attoparsec >= 0.13.2.5 && < 0.15,
-    primitive  >= 0.7.1.0  && < 0.10
+    base       ^>= 4.14.1.0,
+    bytestring ^>= 0.11.1.0,
+    vector     ^>= 0.12.2.0,
+    attoparsec  >= 0.13.2.5 && < 0.15,
+    primitive  ^>= 0.7.1.0
   ghc-options: -Wall
 
 library
diff --git a/main/ips.hs b/main/ips.hs
index 71925ff..2236ca6 100644
--- a/main/ips.hs
+++ b/main/ips.hs
@@ -2,9 +2,8 @@ module Main (main) where
 
 import IPS (Bytes, makeBytes)
 import qualified IPS
-import System.Environment (getArgs)
-import System.Exit (exitFailure)
-import System.IO (hPutBuf, withFile, IOMode(WriteMode))
+import System.Environment
+import System.IO
 import qualified Data.ByteString as ByteString
 import qualified Data.Vector.Storable as Vector
 
@@ -14,11 +13,9 @@ main = do
   case args of
     [inf, ipsf, outf] -> do
       buf <- readBytes inf
-      ips <- either error id <$> IPS.parseFile ipsf
+      ips <- either error id <$> IPS.read ipsf
       writeBytes outf $ IPS.apply ips buf
-    _ -> do
-      putStrLn "usage: ips <in> <ips> <out>"
-      exitFailure
+    _ -> error "usage: $0 <in> <ips> <out>"
 
 readBytes :: FilePath -> IO Bytes
 readBytes f = makeBytes <$> ByteString.readFile f