diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -92,7 +92,7 @@
   when (isNothing (optDCC opts)) (commandLineError "no day counting convention specified\n")
   when (isNothing (optRate opts)) (commandLineError "no interest rate specified\n")
   let ledgerInputOptions = definputopts { balancingopts_ = (balancingopts_ definputopts) { ignore_assertions_ = optIgnoreAssertions opts } }
-  jnl' <- readJournalFiles ledgerInputOptions (reverse (optInput opts)) >>= either fail return
+  jnl' <- runExceptT (readJournalFiles ledgerInputOptions (reverse (optInput opts))) >>= either fail return
   interestAcc <- case args of
                    []    -> commandLineError "required argument ACCOUNT is missing\n"
                    [acc] -> return $ T.pack acc
diff --git a/hledger-interest.cabal b/hledger-interest.cabal
--- a/hledger-interest.cabal
+++ b/hledger-interest.cabal
@@ -1,5 +1,5 @@
 Name:                   hledger-interest
-Version:                1.6.3
+Version:                1.6.4
 Synopsis:               computes interest for a given account
 License:                BSD3
 License-file:           LICENSE
@@ -119,7 +119,7 @@
 Executable hledger-interest
   default-language:     Haskell2010
   Main-is:              Main.hs
-  Build-depends:        base >= 3 && < 5, hledger-lib == 1.23.*, time, mtl, Cabal, Decimal, text
+  Build-depends:        base >= 3 && < 5, hledger-lib >= 1.26 && < 1.27, time, mtl, Cabal, Decimal, text
   other-modules:        Hledger.Interest
                         Hledger.Interest.DayCountConvention
                         Hledger.Interest.Rate