diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -7,6 +7,7 @@
 import System.Exit
 import Data.Time
 import Data.Either
+import qualified Data.Text as T
 
 data PostingWithPath = PostingWithPath {
                      ppposting :: Posting,
@@ -64,7 +65,7 @@
     Right j <- readJournalFile (Just "journal") Nothing False fn
     return j
 
-matchingPostings :: String -> Journal -> [PostingWithPath]
+matchingPostings :: AccountName -> Journal -> [PostingWithPath]
 matchingPostings acct j = filter ((== acct) . paccount . ppposting) $ allPostingsWithPath j
 
 pickSide :: Side -> (a,a) -> a
@@ -77,12 +78,12 @@
 
 main :: IO ()
 main = getArgs >>= \args -> case args of
-  [acct, f1, f2] -> diffCmd acct f1 f2
+  [acct, f1, f2] -> diffCmd (T.pack acct) f1 f2
   _ -> do
     putStrLn "Usage: hledger-diff account:name left.journal right.journal"
     exitFailure
 
-diffCmd :: String -> FilePath -> FilePath -> IO ()
+diffCmd :: AccountName -> FilePath -> FilePath -> IO ()
 diffCmd acct f1 f2 = do
   j1 <- readJournalFile' f1
   j2 <- readJournalFile' f2
diff --git a/hledger-diff.cabal b/hledger-diff.cabal
--- a/hledger-diff.cabal
+++ b/hledger-diff.cabal
@@ -1,5 +1,5 @@
 name:                hledger-diff
-version:             0.2.0.5
+version:             0.2.0.6
 synopsis:            Compares the transactions in two ledger files.
 description:
   hledger-diff is a command-line utility to compare two journal files.  It
@@ -24,6 +24,7 @@
   main-is:             Main.hs
   build-depends:
     base >=4.6 && <4.10,
-    hledger-lib >=0.24 && <0.28,
+    hledger-lib >=1 && <1.1,
+    text,
     time
   default-language:    Haskell2010