diff --git a/hledger-web.cabal b/hledger-web.cabal
--- a/hledger-web.cabal
+++ b/hledger-web.cabal
@@ -1,5 +1,5 @@
 name:           hledger-web
-version: 0.18
+version: 0.18.1
 category:       Finance
 synopsis:       A web interface for the hledger accounting tool.
 description:    
@@ -47,6 +47,10 @@
     Description:   Build with support for multithreaded execution.
     Default:       True
 
+flag blaze_html_0_5
+    description:   Use the newer 0.5 version of blaze-html and blaze-markup.
+    default:       False
+
 flag dev
     Description:   Turn on development settings, like auto-reload templates.
     Default:       False
@@ -61,9 +65,6 @@
     else
         Buildable: False
 
-    if flag(threaded)
-        ghc-options:   -threaded
-
     exposed-modules: 
                      Hledger.Web.Application
     other-modules:
@@ -122,8 +123,8 @@
                      Hledger.Web.Handlers
 
     build-depends:
-                     hledger == 0.18
-                   , hledger-lib == 0.18
+                     hledger == 0.18.1
+                   , hledger-lib == 0.18.1
                    , base                          >= 4          && < 5
                    , cabal-file-th
                    , cmdargs >= 0.9.1   && < 0.10
@@ -141,7 +142,6 @@
                    , yesod-core
                    , yesod-default
                    , yesod-static
-                   , blaze-html                    < 0.5
                    , clientsession
                    , hamlet
                    , network-conduit
@@ -153,6 +153,13 @@
                    , wai-extra
                    , warp
                    , yaml
+    if flag(blaze_html_0_5)
+      build-depends:
+                     blaze-html               >= 0.5     && < 0.6
+                   , blaze-markup             >= 0.5.1   && < 0.6
+    else
+      build-depends:
+                     blaze-html               >= 0.4     && < 0.5
 
 
   -- if flag(production)
diff --git a/hledger-web.hs b/hledger-web.hs
--- a/hledger-web.hs
+++ b/hledger-web.hs
@@ -42,7 +42,7 @@
   | "help" `in_` (rawopts_ $ cliopts_ opts)            = putStr (showModeHelp webmode) >> exitSuccess
   | "version" `in_` (rawopts_ $ cliopts_ opts)         = putStrLn prognameandversion >> exitSuccess
   | "binary-filename" `in_` (rawopts_ $ cliopts_ opts) = putStrLn (binaryfilename progname)
-  | otherwise                                          = journalFilePathFromOpts (cliopts_ opts) >>= ensureJournalFileExists >> withJournalDo' opts web
+  | otherwise                                          = journalFilePathFromOpts (cliopts_ opts) >>= requireJournalFileExists >> withJournalDo' opts web
 
 withJournalDo' :: WebOpts -> (WebOpts -> Journal -> IO ()) -> IO ()
 withJournalDo' opts cmd = do