diff --git a/README b/README
--- a/README
+++ b/README
@@ -2521,10 +2521,9 @@
     Comment: This is a sample mmd title block, with
              a field spanning multiple lines.
 
-See the MultiMarkdown documentation for details. Note that only title,
-author, and date are recognized; other fields are simply ignored by
-pandoc. If `pandoc_title_block` or `yaml_metadata_block` is enabled,
-it will take precedence over `mmd_title_block`.
+See the MultiMarkdown documentation for details.  If `pandoc_title_block` or
+`yaml_metadata_block` is enabled, it will take precedence over
+`mmd_title_block`.
 
   [MultiMarkdown]: http://fletcherpenney.net/multimarkdown/
 
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,7 @@
+pandoc (1.12.3.1)
+
+  * Relaxed version constraint on binary, allowing the use of binary 0.5.
+
 pandoc (1.12.3)
 
   * The `--bibliography` option now sets the `biblio-files` variable.
@@ -35,6 +39,8 @@
       If author field was empty, date was being ignored.
     + Allow backslash-newline hard line breaks in grid and
       multiline table cells.
+    + Citation keys may now start with underscores, and may contain
+      underscores adjacent to internal punctuation.
 
   * LaTeX reader:
 
@@ -232,8 +238,6 @@
     + Yaml block must start immediately after `---`.  If there's a blank
       line after `---`, we interpreted it as a horizontal rule.
     + Correctly handle empty bullet list items.
-    + Citation keys may now start with underscores, and may contain
-      underscores adjacent to internal punctuation.
     + Stop parsing "list lines" when we hit a block tag.
       This fixes exponential slowdown in certain input, e.g.
       a series of lists followed by `</div>`.
diff --git a/man/man5/pandoc_markdown.5 b/man/man5/pandoc_markdown.5
--- a/man/man5/pandoc_markdown.5
+++ b/man/man5/pandoc_markdown.5
@@ -2224,8 +2224,6 @@
 .fi
 .PP
 See the MultiMarkdown documentation for details.
-Note that only title, author, and date are recognized; other fields are
-simply ignored by pandoc.
 If \f[C]pandoc_title_block\f[] or \f[C]yaml_metadata_block\f[] is
 enabled, it will take precedence over \f[C]mmd_title_block\f[].
 .PP
diff --git a/pandoc.cabal b/pandoc.cabal
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -1,5 +1,5 @@
 Name:            pandoc
-Version:         1.12.3
+Version:         1.12.3.1
 Cabal-Version:   >= 1.10
 Build-Type:      Custom
 License:         GPL
@@ -233,7 +233,7 @@
                  yaml >= 0.8.3 && < 0.9,
                  vector >= 0.10 && < 0.11,
                  hslua >= 0.3 && < 0.4,
-                 binary >= 0.6 && < 0.8
+                 binary >= 0.5 && < 0.8
   Build-Tools:   alex, happy
   if flag(http-conduit)
      Build-Depends: http-conduit >= 1.9 && < 2.1,
diff --git a/src/Text/Pandoc/ImageSize.hs b/src/Text/Pandoc/ImageSize.hs
--- a/src/Text/Pandoc/ImageSize.hs
+++ b/src/Text/Pandoc/ImageSize.hs
@@ -182,9 +182,12 @@
        Nothing -> fail "Did not find length record"
 
 exifSize :: ByteString -> Maybe ImageSize
-exifSize = -- runGet ((Just <$> exifHeader) `mplus` return Nothing) .
-  runGet (Just <$> exifHeader) .
-           BL.fromChunks . (:[])
+exifSize = runGet (Just <$> exifHeader) .  BL.fromChunks . (:[])
+-- NOTE:  It would be nicer to do
+-- runGet ((Just <$> exifHeader) <|> return Nothing)
+-- which would prevent pandoc from raising an error when an exif header can't
+-- be parsed.  But we only get an Alternative instance for Get in binary 0.6,
+-- and binary 0.5 ships with ghc 7.6.
 
 exifHeader :: Get ImageSize
 exifHeader = do