diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -2,6 +2,15 @@
 See also the hledger and the project change logs.
 
 
+# 1.3.1 (2017/8/25)
+
+* allow megaparsec 6 (#594, Simon Michael, Hans-Peter Deifel)
+
+* allow megaparsec-6.1 (Hans-Peter Deifel)
+
+* restore upper bounds on hledger packages
+
+
 # 1.3 (2017/6/30)
 
 Depends on hledger[-lib] 1.3, see related changelogs.
diff --git a/Handler/AddForm.hs b/Handler/AddForm.hs
--- a/Handler/AddForm.hs
+++ b/Handler/AddForm.hs
@@ -17,7 +17,7 @@
 import Data.Text (append, pack, unpack)
 import qualified Data.Text as T
 import Data.Time.Calendar
-import Text.Megaparsec (digitChar, eof, some, string, runParser, ParseError, Dec)
+import Text.Megaparsec.Compat (digitChar, eof, some, string, runParser, ParseError, MPErr)
 
 import Hledger.Utils
 import Hledger.Data hiding (num)
@@ -83,7 +83,7 @@
       let numberedParams s =
             reverse $ dropWhile (T.null . snd) $ reverse $ sort
             [ (n,v) | (k,v) <- params
-                    , let en = parsewith (paramnamep s) k :: Either (ParseError Char Dec) Int
+                    , let en = parsewith (paramnamep s) k :: Either (ParseError Char MPErr) Int
                     , isRight en
                     , let Right n = en
                     ]
diff --git a/doc/hledger-web.1 b/doc/hledger-web.1
--- a/doc/hledger-web.1
+++ b/doc/hledger-web.1
@@ -1,5 +1,5 @@
 
-.TH "hledger\-web" "1" "June 2017" "hledger\-web 1.3" "hledger User Manuals"
+.TH "hledger\-web" "1" "August 2017" "hledger\-web 1.3.1" "hledger User Manuals"
 
 
 
diff --git a/doc/hledger-web.1.info b/doc/hledger-web.1.info
--- a/doc/hledger-web.1.info
+++ b/doc/hledger-web.1.info
@@ -3,8 +3,8 @@
 
 File: hledger-web.1.info,  Node: Top,  Next: OPTIONS,  Up: (dir)
 
-hledger-web(1) hledger-web 1.3
-******************************
+hledger-web(1) hledger-web 1.3.1
+********************************
 
 hledger-web is hledger's web interface.  It starts a simple web
 application for browsing and adding transactions, and optionally opens
@@ -201,7 +201,7 @@
 
 Tag Table:
 Node: Top74
-Node: OPTIONS3156
-Ref: #options3243
+Node: OPTIONS3160
+Ref: #options3247
 
 End Tag Table
diff --git a/doc/hledger-web.1.txt b/doc/hledger-web.1.txt
--- a/doc/hledger-web.1.txt
+++ b/doc/hledger-web.1.txt
@@ -237,4 +237,4 @@
 
 
 
-hledger-web 1.3                    June 2017                    hledger-web(1)
+hledger-web 1.3.1                 August 2017                   hledger-web(1)
diff --git a/hledger-web.cabal b/hledger-web.cabal
--- a/hledger-web.cabal
+++ b/hledger-web.cabal
@@ -1,9 +1,9 @@
--- This file has been generated from package.yaml by hpack version 0.17.0.
+-- This file has been generated from package.yaml by hpack version 0.17.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           hledger-web
-version:        1.3
+version:        1.3.1
 synopsis:       Web interface for the hledger accounting tool
 description:    This is hledger's web interface.
                 It provides a more user-friendly and collaborative UI than the
@@ -125,10 +125,10 @@
 
 library
   ghc-options: -Wall -fno-warn-unused-do-bind -fno-warn-name-shadowing -fno-warn-missing-signatures -fno-warn-type-defaults -fno-warn-orphans
-  cpp-options: -DVERSION="1.3"
+  cpp-options: -DVERSION="1.3.1"
   build-depends:
-      hledger-lib >= 1.3
-    , hledger >= 1.3
+      hledger-lib >= 1.3.1 && < 1.4
+    , hledger >= 1.3.1 && < 1.4
     , base >=4.8 && <5
     , base-compat >=0.8.1
     , blaze-html
@@ -159,7 +159,7 @@
     , yesod-form
     , yesod-static
     , json
-    , megaparsec >=5.0 && < 5.4
+    , megaparsec >=5.0 && < 6.2
     , mtl
   if (flag(dev)) || (flag(library-only))
     cpp-options: -DDEVELOPMENT
@@ -199,10 +199,10 @@
   hs-source-dirs:
       app
   ghc-options: -Wall -fno-warn-unused-do-bind -fno-warn-name-shadowing -fno-warn-missing-signatures -fno-warn-type-defaults -fno-warn-orphans
-  cpp-options: -DVERSION="1.3"
+  cpp-options: -DVERSION="1.3.1"
   build-depends:
-      hledger-lib >= 1.3
-    , hledger >= 1.3
+      hledger-lib >= 1.3.1 && < 1.4
+    , hledger >= 1.3.1 && < 1.4
     , base >=4.8 && <5
     , base-compat >=0.8.1
     , blaze-html
@@ -234,7 +234,7 @@
     , yesod-static
     , json
     , parsec >=3
-    , hledger-web == 1.3
+    , hledger-web == 1.3.1
   if flag(library-only)
     buildable: False
   if flag(threaded)
@@ -261,10 +261,10 @@
   hs-source-dirs:
       tests
   ghc-options: -Wall -fno-warn-unused-do-bind -fno-warn-name-shadowing -fno-warn-missing-signatures -fno-warn-type-defaults -fno-warn-orphans
-  cpp-options: -DVERSION="1.3"
+  cpp-options: -DVERSION="1.3.1"
   build-depends:
-      hledger-lib >= 1.3
-    , hledger >= 1.3
+      hledger-lib >= 1.3.1 && < 1.4
+    , hledger >= 1.3.1 && < 1.4
     , base >=4.8 && <5
     , base-compat >=0.8.1
     , blaze-html
@@ -295,7 +295,6 @@
     , yesod-form
     , yesod-static
     , json
-    , hledger-web == 1.3
     , hspec
     , yesod-test
   if flag(oldtime)