diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,11 @@
 User-visible changes in hledger-api. See also hledger, hledger-lib.
 
 
+# 1.9.1 (2018/4/30)
+
+* use hledger-lib 1.9.1
+
+
 # 1.9 (2018/3/31)
 
 * support ghc 8.4, latest deps
diff --git a/hledger-api.1 b/hledger-api.1
--- a/hledger-api.1
+++ b/hledger-api.1
@@ -1,5 +1,5 @@
 
-.TH "hledger\-api" "1" "March 2018" "hledger\-api 1.9" "hledger User Manuals"
+.TH "hledger\-api" "1" "April 2018" "hledger\-api 1.9.1" "hledger User Manuals"
 
 
 
diff --git a/hledger-api.cabal b/hledger-api.cabal
--- a/hledger-api.cabal
+++ b/hledger-api.cabal
@@ -1,11 +1,11 @@
--- This file has been generated from package.yaml by hpack version 0.20.0.
+-- This file has been generated from package.yaml by hpack version 0.28.2.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: f3634e33165cee47d5e654d9261a1c38195c0466a0c52c659e5833033a73416a
+-- hash: ddd609623effac971ca9071b9698def791a428506794509717a218c0a5b2bde1
 
 name:           hledger-api
-version:        1.9
+version:        1.9.1
 synopsis:       Web API server for the hledger accounting tool
 description:    This is a simple web API server for hledger data.
                 It comes with a series of simple client-side web app examples.
@@ -27,7 +27,6 @@
 tested-with:    GHC==7.10.3, GHC==8.0.2, GHC==8.2.1
 build-type:     Simple
 cabal-version:  >= 1.10
-
 extra-source-files:
     CHANGES
     examples/01.html
@@ -43,18 +42,21 @@
 
 executable hledger-api
   main-is: hledger-api.hs
+  other-modules:
+      Paths_hledger_api
   ghc-options: -threaded
-  cpp-options: -DVERSION="1.9"
+  cpp-options: -DVERSION="1.9.1"
   build-depends:
       Decimal
     , aeson
     , base >=4.8 && <4.12
     , bytestring
     , containers
+    , data-default >=0.5
     , docopt
     , either
-    , hledger >=1.9 && <2.0
-    , hledger-lib >=1.9 && <2.0
+    , hledger >=1.9.1 && <2.0
+    , hledger-lib >=1.9.1 && <2.0
     , microlens >=0.4
     , microlens-platform >=0.2.3.1
     , safe
@@ -66,6 +68,4 @@
     , wai
     , wai-extra
     , warp
-  other-modules:
-      Paths_hledger_api
   default-language: Haskell2010
diff --git a/hledger-api.hs b/hledger-api.hs
--- a/hledger-api.hs
+++ b/hledger-api.hs
@@ -17,6 +17,7 @@
 import           Data.Aeson
 import qualified Data.ByteString.Lazy.Char8 as BL8
 import           Data.Decimal
+import           Data.Default
 import qualified Data.Map as M
 import           Data.Proxy
 import           Data.String (fromString)
@@ -36,12 +37,12 @@
 import Hledger.Query
 import Hledger.Cli hiding (Reader, version)
 
-hledgerApiVersion="1.9"
+hledgerApiVersion="1.9.1"
 
 -- https://github.com/docopt/docopt.hs#readme
 doc :: Docopt
 doc = [docopt|
-hledger-api 1.9
+hledger-api 1.9.1
 
 Serves hledger data and reports as a JSON web API.
 
@@ -90,7 +91,7 @@
   let
     defd = "."
     d = getArgWithDefault args defd (longOption "static-dir")
-  readJournalFile Nothing Nothing True f >>= either error' (serveApi h p d f)
+  readJournalFile def f >>= either error' (serveApi h p d f)
 
 serveApi :: String -> Int -> FilePath -> FilePath -> Journal -> IO ()
 serveApi h p d f j = do
diff --git a/hledger-api.info b/hledger-api.info
--- a/hledger-api.info
+++ b/hledger-api.info
@@ -3,8 +3,8 @@
 
 File: hledger-api.info,  Node: Top,  Next: OPTIONS,  Up: (dir)
 
-hledger-api(1) hledger-api 1.9
-******************************
+hledger-api(1) hledger-api 1.9.1
+********************************
 
 hledger-api is a simple web API server, intended to support client-side
 web apps operating on hledger data.  It comes with a series of simple
@@ -80,7 +80,7 @@
 
 Tag Table:
 Node: Top72
-Node: OPTIONS1658
-Ref: #options1743
+Node: OPTIONS1662
+Ref: #options1747
 
 End Tag Table
diff --git a/hledger-api.txt b/hledger-api.txt
--- a/hledger-api.txt
+++ b/hledger-api.txt
@@ -117,4 +117,4 @@
 
 
 
-hledger-api 1.9                   March 2018                    hledger-api(1)
+hledger-api 1.9.1                 April 2018                    hledger-api(1)