diff --git a/pandoc.cabal b/pandoc.cabal
index cdb3e92f9..18c66ed0e 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -316,7 +316,7 @@ library
                  tagsoup >= 0.13.7 && < 0.15,
                  base64-bytestring >= 0.1 && < 1.1,
                  zlib >= 0.5 && < 0.7,
-                 skylighting >= 0.3.4.1 && < 0.4,
+                 skylighting >= 0.3.5 && < 0.4,
                  data-default >= 0.4 && < 0.8,
                  temporary >= 1.1 && < 1.3,
                  blaze-html >= 0.5 && < 0.10,
@@ -553,7 +553,7 @@ test-suite test-pandoc
                   filepath >= 1.1 && < 1.5,
                   hslua >= 0.8 && < 0.9,
                   process >= 1.2.3 && < 1.7,
-                  skylighting >= 0.3.4.1 && < 0.4,
+                  skylighting >= 0.3.5 && < 0.4,
                   temporary >= 1.1 && < 1.3,
                   Diff >= 0.2 && < 0.4,
                   tasty >= 0.11 && < 0.12,
diff --git a/src/Text/Pandoc/Extensions.hs b/src/Text/Pandoc/Extensions.hs
index 95e59063b..5d3a4cb29 100644
--- a/src/Text/Pandoc/Extensions.hs
+++ b/src/Text/Pandoc/Extensions.hs
@@ -51,10 +51,16 @@ import Data.Typeable (Typeable)
 import GHC.Generics (Generic)
 import Text.Pandoc.Shared (safeRead)
 import Text.Parsec
+import Data.Aeson (ToJSON(..), FromJSON(..),
+                   genericToEncoding, defaultOptions)
 
 newtype Extensions = Extensions Integer
   deriving (Show, Read, Eq, Ord, Data, Typeable, Generic)
 
+instance ToJSON Extensions where
+  toEncoding = genericToEncoding defaultOptions
+instance FromJSON Extensions
+
 instance Monoid Extensions where
   mempty = Extensions 0
   mappend (Extensions a) (Extensions b) = Extensions (a .|. b)
@@ -148,6 +154,10 @@ data Extension =
     | Ext_spaced_reference_links -- ^ Allow space between two parts of ref link
     deriving (Show, Read, Enum, Eq, Ord, Bounded, Data, Typeable, Generic)
 
+instance ToJSON Extension where
+  toEncoding = genericToEncoding defaultOptions
+instance FromJSON Extension
+
 -- | Extensions to be used with pandoc-flavored markdown.
 pandocExtensions :: Extensions
 pandocExtensions = extensionsFromList
diff --git a/src/Text/Pandoc/Options.hs b/src/Text/Pandoc/Options.hs
index 0bd66d54d..7046e984a 100644
--- a/src/Text/Pandoc/Options.hs
+++ b/src/Text/Pandoc/Options.hs
@@ -68,6 +68,10 @@ data ReaderOptions = ReaderOptions{
        , readerTrackChanges          :: TrackChanges
 } deriving (Show, Read, Data, Typeable, Generic)
 
+instance ToJSON ReaderOptions where
+  toEncoding = genericToEncoding defaultOptions
+instance FromJSON ReaderOptions
+
 instance Default ReaderOptions
   where def = ReaderOptions{
                  readerExtensions            = emptyExtensions
@@ -221,6 +225,10 @@ data WriterOptions = WriterOptions
   , writerSyntaxMap         :: SyntaxMap
   } deriving (Show, Data, Typeable, Generic)
 
+instance ToJSON WriterOptions where
+  toEncoding = genericToEncoding defaultOptions
+instance FromJSON WriterOptions
+
 instance Default WriterOptions where
   def = WriterOptions { writerTemplate         = Nothing
                       , writerVariables        = []
diff --git a/stack.pkg.yaml b/stack.pkg.yaml
index 80ef88d84..ffa304b64 100644
--- a/stack.pkg.yaml
+++ b/stack.pkg.yaml
@@ -19,7 +19,7 @@ packages:
 extra-deps:
 - texmath-0.9.4.2
 - hslua-0.8.0
-- skylighting-0.3.4.1
+- skylighting-0.3.5
 - cmark-gfm-0.1.1
 - QuickCheck-2.10.0.1
 - tasty-quickcheck-0.9.1
diff --git a/stack.yaml b/stack.yaml
index 38042c5b7..eeb6f4cdb 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -9,7 +9,7 @@ packages:
 extra-deps:
 - texmath-0.9.4.2
 - hslua-0.8.0
-- skylighting-0.3.4.1
+- skylighting-0.3.5
 - cmark-gfm-0.1.1
 - QuickCheck-2.10.0.1
 - tasty-quickcheck-0.9.1