diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@
 
 ## [Unreleased]
 
+## [0.1.3]
+
+### Changed
+- Updated dependencies. Should be able to use with recent versions of Stack LTS releases and Nix channels.
+
 ## [0.1.2]
 
 ### Added
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/elben/pencil.svg?branch=master)](https://travis-ci.org/elben/pencil)
+[![CircleCI](https://circleci.com/gh/elben/pencil/tree/master.svg?style=svg)](https://circleci.com/gh/elben/pencil/tree/master)
 
 # Pencil
 
@@ -14,13 +14,23 @@
 > marble topped tables, the smell of early morning... and luck were all you
 > needed. — Ernest Hemingway, A Moveable Feast
 
+# Setup
+
+First, make sure you have `nix` installed:
+
+```bash
+curl https://nixos.org/nix/install | sh
+nix-channel --add https://nixos.org/channels/nixos-18.09 nixpkgs
+nix-channel --update
+```
+
 # Examples
 
 Checkout the [examples provided](https://github.com/elben/pencil/tree/master/examples). To run the [Simple](https://github.com/elben/pencil/tree/master/examples/Simple) example:
 
 ```
-stack build
-stack exec pencil-example-simple
+nix-shell --attr env
+[nix-shell]$ cabal new-run pencil-example-simple
 ```
 
 Open the `examples/Simple/out/` folder to see the rendered web pages. To serve
diff --git a/pencil.cabal b/pencil.cabal
--- a/pencil.cabal
+++ b/pencil.cabal
@@ -1,5 +1,5 @@
 name:                pencil
-version:             0.1.2
+version:             0.1.3
 synopsis: Static site generator
 description:
   Pencil is a static site generator. Use it to generate your personal website!
@@ -29,12 +29,11 @@
                      , data-default >= 0.7 && < 1
                      , directory >= 1.2.5.0 && < 1.4
                      , edit-distance >= 0.2.2.1 && < 0.3
-                     , feed >= 0.3.12.0 && < 1
                      , filepath >= 1.4 && < 1.5
                      , hashable >= 1.2.6.0 && < 1.3
-                     , hsass >= 0.4.0 && < 0.5
+                     , hsass >= 0.8 && < 1
                      , mtl >= 2.2 && < 3
-                     , pandoc >= 1.19.2.4 && < 2
+                     , pandoc >= 2.0 && < 3
                      , semigroups >= 0.18.2 && < 0.19
                      , parsec >= 3.1 && < 3.2
                      , text >= 1.2.2 && < 1.3
@@ -42,7 +41,7 @@
                      , unordered-containers >= 0.2.7.2 && < 0.3
                      , vector >= 0.12.0 && < 0.13
                      , xml >= 1.3.10 && < 1.4
-                     , yaml >= 0.8.23 && < 0.9
+                     , yaml >= 0.8.32 && < 0.12
   default-language:    Haskell2010
 
 test-suite pencil-test
@@ -51,11 +50,12 @@
   main-is:             Spec.hs
   build-depends:       base >= 4.8 && < 5
                      , pencil
-                     , doctest >= 0.11.4 && < 0.12
+                     , doctest >= 0.16.0.1 && < 1
   ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
   default-language:    Haskell2010
 
-executable pencil-example-simple
+test-suite pencil-example-simple
+  type:                exitcode-stdio-1.0
   hs-source-dirs:      examples/Simple
   main-is:             Main.hs
   ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
@@ -63,7 +63,8 @@
                      , pencil
   default-language:    Haskell2010
 
-executable pencil-example-blog
+test-suite pencil-example-blog
+  type:                exitcode-stdio-1.0
   hs-source-dirs:      examples/Blog
   main-is:             Main.hs
   ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
diff --git a/src/Pencil/Internal/Pencil.hs b/src/Pencil/Internal/Pencil.hs
--- a/src/Pencil/Internal/Pencil.hs
+++ b/src/Pencil/Internal/Pencil.hs
@@ -32,6 +32,8 @@
 import qualified System.Directory as D
 import qualified System.FilePath as FP
 import qualified Text.Pandoc as P
+import qualified Text.Pandoc.Highlighting
+import Text.Pandoc.Extensions (enableExtension, Extension(..))
 import qualified Text.Sass as Sass
 
 -- | The main monad transformer stack for a Pencil application.
@@ -76,8 +78,10 @@
 --  , 'configEnv' = HashMap.empty
 --  , 'configDisplayValue' = 'toText'
 --  , 'configSassOptions' = Text.Sass.Options.defaultSassOptions
---  , 'configPandocReaderOptions' = Text.Pandoc.def
---  , 'configPandocWriterOptions' = Text.Pandoc.def { Text.Pandoc.writerHighlight = True }
+--  , 'configPandocReaderOptions' = Text.Pandoc.def {
+--       Text.Pandoc.readerExtensions = Text.Pandoc.Extensions.getDefaultExtensions "markdown"
+--    }
+--  , 'configPandocWriterOptions' = Text.Pandoc.def { Text.Pandoc.writerHighlightStyle = Just Text.Pandoc.Highlighting.monochrome }
 --  , 'configDisplayValue = 'toText'
 --  }
 -- @
@@ -88,8 +92,15 @@
   , configOutputDir = "out/"
   , configEnv = H.empty
   , configSassOptions = Text.Sass.Options.defaultSassOptions
-  , configPandocReaderOptions = P.def
-  , configPandocWriterOptions = P.def { P.writerHighlight = True }
+
+  -- For markdown reader. We use getDefaultExtensions "markdown" here to get default Markdown extensions.
+  -- See https://hackage.haskell.org/package/pandoc-2.5/docs/Text-Pandoc-Extensions.html#v:getDefaultExtensions
+  , configPandocReaderOptions = P.def {
+      P.readerExtensions = P.getDefaultExtensions "markdown"
+    }
+  , configPandocWriterOptions = P.def {
+      P.writerHighlightStyle = Just Text.Pandoc.Highlighting.monochrome
+    }
   , configDisplayValue = toText
   }
 
@@ -188,34 +199,38 @@
 run app config = do
   e <- runExceptT $ runReaderT app config
   case e of
-    Left err ->
-      case err of
-        FileNotFound mfp ->
-          case mfp of
-            Just fp -> do
-              e2 <- runExceptT $ runReaderT (mostSimilarFile fp) config
-              case e2 of
-                Left _ -> return ()
-                Right mBest ->
-                  case mBest of
-                    Just best -> putStrLn ("Maybe you mean this: " ++ best)
-                    Nothing -> return ()
-            Nothing -> return ()
-        VarNotInEnv var fp ->
-          putStrLn ("Variable ${" ++ T.unpack var ++ "}" ++ " not found in the environment when rendering file " ++ fp ++ ".")
+    Left (VarNotInEnv var fp) ->
+      putStrLn ("Variable ${" ++ T.unpack var ++ "}" ++ " not found in the environment when rendering file " ++ fp ++ ".")
+    Left (FileNotFound (Just fp)) -> do
+      e2 <- runExceptT $ runReaderT (mostSimilarFiles fp) config
+      case e2 of
+        Right closestFiles ->
+          if not (null closestFiles)
+          then do
+            putStrLn ("File " ++ fp ++ " not found. Maybe you meant: ")
+            printAsList (take 3 closestFiles)
+          else putStrLn ("File " ++ fp ++ " not found.")
         _ -> return ()
-    Right _ -> return ()
+    _ -> return ()
 
+-- Print the list of Strings, one line at a time, prefixed with "-".
+printAsList :: [String] -> IO ()
+printAsList [] = return ()
+printAsList (a:as) = do
+  putStr "- "
+  putStrLn a
+  printAsList as
+
 -- | Given a file path, look at all file paths and find the one that seems most
 -- similar.
-mostSimilarFile :: FilePath -> PencilApp (Maybe FilePath)
-mostSimilarFile fp = do
+mostSimilarFiles :: FilePath -> PencilApp [FilePath]
+mostSimilarFiles fp = do
   sitePrefix <- asks getSourceDir
   fps <- listDir True ""
   let fps' = map (sitePrefix ++) fps -- add site prefix for distance search
   let costs = map (\f -> (f, levenshteinDistance defaultEditCosts fp f)) fps'
   let sorted = L.sortBy (\(_, d1) (_, d2) -> compare d1 d2) costs
-  return $ fst <$> M.listToMaybe sorted
+  return $ map fst sorted
 
 -- | Known Pencil errors that we know how to either recover from or quit
 -- gracefully.
@@ -425,6 +440,11 @@
 isNoSuchFile :: IOError -> Bool
 isNoSuchFile e = ioe_type e == NoSuchThing
 
+readMarkdownWriteHtml :: P.PandocMonad m => P.ReaderOptions -> P.WriterOptions -> T.Text -> m T.Text
+readMarkdownWriteHtml readerOptions writerOptions content  = do
+  pandoc <- P.readMarkdown readerOptions content
+  P.writeHtml5String writerOptions pandoc
+
 -- | Loads and parses the given file path. Converts 'Markdown' files to HTML,
 -- compiles 'Sass' files into CSS, and leaves everything else alone.
 parseAndConvertTextFiles :: FilePath -> PencilApp (T.Text, [PNode])
@@ -435,9 +455,10 @@
       Markdown -> do
         pandocReaderOptions <- asks getPandocReaderOptions
         pandocWriterOptions <- asks getPandocWriterOptions
-        case P.readMarkdown pandocReaderOptions (T.unpack content) of
+        result <- liftIO $ P.runIO (readMarkdownWriteHtml pandocReaderOptions pandocWriterOptions content)
+        case result of
           Left _ -> return content
-          Right pandoc -> return $ T.pack $ P.writeHtmlString pandocWriterOptions pandoc
+          Right text -> return text
       Sass -> do
         sassOptions <- asks getSassOptions
         sitePrefix <- asks getSourceDir
@@ -589,7 +610,7 @@
         -> FilePath
         -> PencilApp [FilePath]
 listDir recursive dir = do
-  let dir' = FP.addTrailingPathSeparator dir
+  let dir' = if null dir then dir else FP.addTrailingPathSeparator dir
   fps <- listDir_ recursive dir'
   return $ map (dir' ++) fps
 
@@ -770,7 +791,7 @@
   -- wasn't a text file, then return a Passthroguh resource. This is where we
   -- finally handle the "checked" exception; that is, converting the Left error
   -- case (NotTextFile) into a Right case (Passthrough).
-  liftM Single (load fpf fp)
+  fmap Single (load fpf fp)
     `catchError` handle
   -- 'handle' requires FlexibleContexts
   where handle e = case e of
@@ -814,13 +835,13 @@
   let env = findEnv nodes
   let fp' = "/" ++ fpf fp
   let env' = H.insert "this.url" (VText (T.pack fp')) env
-  return $ Page nodes env' ("/" ++ fpf fp)
+  return $ Page nodes env' fp'
 
 -- | Find preamble node, and load as an Env. If no preamble is found, return a
 -- blank Env.
 findEnv :: [PNode] -> Env
 findEnv nodes =
-  aesonToEnv $ M.fromMaybe H.empty (findPreambleText nodes >>= (A.decode . encodeUtf8 . T.strip))
+  aesonToEnv $ M.fromMaybe H.empty (findPreambleText nodes >>= (A.decodeThrow . encodeUtf8 . T.strip))
 
 -- | Loads and renders file as CSS.
 --