diff --git a/bower.json b/bower.json
index 3710af0..4c6383b 100644
--- a/bower.json
+++ b/bower.json
@@ -24,11 +24,12 @@
     "test"
   ],
   "dependencies": {
-    "purescript-affjax": "#compiler/0.12",
-    "purescript-argonaut": "cryogenian/purescript-argonaut#compiler/0.12",
-    "purescript-css": "justinwoo/purescript-css#compiler/0.12",
-    "purescript-node-fs-aff": "#compiler/0.12",
-    "purescript-run": "#compiler/0.12",
-    "purescript-xpath": "cryogenian/purescript-xpath#compiler/0.12"
+    "purescript-xpath": "cryogenian/purescript-xpath#compiler/0.12",
+    "purescript-argonaut-core": "^4.0.0",
+    "purescript-argonaut-codecs": "^4.0.0",
+    "purescript-affjax": "^6.0.0",
+    "purescript-css": "^4.0.0",
+    "purescript-node-fs-aff": "^6.0.0",
+    "purescript-run": "cryogenian/purescript-run#compiler/0.12"
   }
 }
diff --git a/package.json b/package.json
index 594017e..dd4e89f 100644
--- a/package.json
+++ b/package.json
@@ -2,16 +2,15 @@
   "name": "purescript-lunapark",
   "private": true,
   "scripts": {
-    "build": "pulp build -- --censor-lib --strict --stash",
+    "build": "pulp build -- --strict --stash",
     "build:non-strict": "pulp build",
-    "bundle": "purs bundle \"output/**/*.js\" --output ./index.js --main Main --module Main",
     "ide": "purs ide server"
   },
   "license": "Apache-2.0",
   "dependencies": {
     "chromedriver": "^2.37.0",
-    "pulp": "^12.0.1",
-    "purescript": "cryogenian/node-purescript-bin#master",
+    "pulp": "^12.2.0",
+    "purescript": "slamdata/node-purescript#0.12",
     "purescript-psa": "^0.6.0",
     "xhr2": "^0.1.4"
   }
diff --git a/src/Lunapark/API.purs b/src/Lunapark/API.purs
index 8a46be7..e710584 100644
--- a/src/Lunapark/API.purs
+++ b/src/Lunapark/API.purs
@@ -3,14 +3,14 @@ module Lunapark.API where
 import Prelude
 
 import Control.Monad.Rec.Class (class MonadRec)
-import Data.Argonaut as J
+import Data.Argonaut.Decode.Class as J
 import Data.Bifunctor (lmap)
 import Data.Either (Either(..), isRight)
 import Data.List (List(..), (:))
 import Data.List as L
 import Data.Map as Map
 import Data.Maybe (Maybe(..))
-import Data.String as Str
+import Data.String.CodeUnits as Str
 import Data.Time.Duration (Milliseconds(..))
 import Data.Traversable as T
 import Data.Variant as V
@@ -533,11 +533,11 @@ handleLunapark inp = case _ of
         let
           try' = do
             a ← try
-            R.liftEffect $ Ref.modify (Map.insert key true) inp.requestMapRef
+            R.liftEffect $ Ref.modify_ (Map.insert key true) inp.requestMapRef
             pure a
           fallback' = do
             a ← fallback
-            R.liftEffect $ Ref.modify (Map.insert key false) inp.requestMapRef
+            R.liftEffect $ Ref.modify_ (Map.insert key false) inp.requestMapRef
             pure a
         in catch try' \_ → fallback'
 
diff --git a/src/Lunapark/Endpoint.purs b/src/Lunapark/Endpoint.purs
index 84aaf71..278180a 100644
--- a/src/Lunapark/Endpoint.purs
+++ b/src/Lunapark/Endpoint.purs
@@ -8,8 +8,9 @@ module Lunapark.Endpoint where
 import Prelude
 
 import Effect.Aff (Aff)
-import Data.Argonaut (Json)
-import Data.Argonaut as J
+import Data.Argonaut.Core (Json)
+import Data.Argonaut.Decode.Combinators ((.?)) as J
+import Data.Argonaut.Decode.Class (decodeJson) as J
 import Data.Bifunctor (lmap)
 import Data.Either (Either(..))
 import Data.Foldable as F
@@ -18,6 +19,8 @@ import Data.Maybe (Maybe(..))
 import Data.Newtype (un)
 import Lunapark.Error as LE
 import Lunapark.Types as LT
+import Network.HTTP.Affjax.Response as NR
+import Network.HTTP.Affjax.Request as NQ
 import Network.HTTP.Affjax as N
 import Network.HTTP.StatusCode (StatusCode(..))
 
@@ -173,13 +176,13 @@ handleAPIError r = case r.status of
   code → Left $ LE.fromJson r.response
 
 get ∷ String → Endpoint → Aff (Either LE.Error Json)
-get uri ep  = map handleAPIError $ N.get (uri <> print ep)
+get uri ep  = map handleAPIError $ N.get NR.json (uri <> print ep)
 
 post ∷ String → Endpoint → Json → Aff (Either LE.Error Json)
-post uri ep obj = map handleAPIError $ N.post (uri <> print ep) obj
+post uri ep obj = map handleAPIError $ N.post NR.json (uri <> print ep) $ NQ.json obj
 
 post_ ∷ String → Endpoint → Aff (Either LE.Error Json)
-post_ uri ep = map handleAPIError $ N.post' (uri <> print ep) (Nothing ∷ Maybe Unit)
+post_ uri ep = map handleAPIError $ N.post' NR.json (uri <> print ep) Nothing
 
 delete ∷ String → Endpoint → Aff (Either LE.Error Json)
-delete uri ep = map handleAPIError $ N.delete (uri <> print ep)
+delete uri ep = map handleAPIError $ N.delete NR.json (uri <> print ep)
diff --git a/src/Lunapark/Error.purs b/src/Lunapark/Error.purs
index ffa9b48..a8131b4 100644
--- a/src/Lunapark/Error.purs
+++ b/src/Lunapark/Error.purs
@@ -2,7 +2,9 @@ module Lunapark.Error where
 
 import Prelude
 
-import Data.Argonaut as J
+import Data.Argonaut.Core as J
+import Data.Argonaut.Decode.Combinators ((.?)) as J
+import Data.Argonaut.Decode.Class (decodeJson) as J
 import Data.Either (Either(..), either)
 
 data ErrorType
diff --git a/src/Lunapark/LunaparkF.purs b/src/Lunapark/LunaparkF.purs
index be0abaa..8132ec3 100644
--- a/src/Lunapark/LunaparkF.purs
+++ b/src/Lunapark/LunaparkF.purs
@@ -2,7 +2,7 @@ module Lunapark.LunaparkF where
 
 import Prelude
 
-import Data.Argonaut as J
+import Data.Argonaut.Core as J
 import Data.Symbol (SProxy(..))
 import Lunapark.Types as LT
 import Run as R
diff --git a/src/Lunapark/Types.purs b/src/Lunapark/Types.purs
index 1a1e6d2..0db5e4f 100644
--- a/src/Lunapark/Types.purs
+++ b/src/Lunapark/Types.purs
@@ -8,8 +8,12 @@ import Prelude
 import CSS.Render as CSSR
 import CSS.Selector as CSS
 import Control.Alt ((<|>))
-import Data.Argonaut (Json, (.?))
-import Data.Argonaut as J
+import Data.Argonaut.Core (Json)
+import Data.Argonaut.Core as J
+import Data.Argonaut.Decode.Class (class DecodeJson, decodeJson) as J
+import Data.Argonaut.Decode.Combinators ((.?))
+import Data.Argonaut.Encode.Class (class EncodeJson, encodeJson) as J
+import Data.Argonaut.Encode.Combinators (extend) as J
 import Data.Array as A
 import Data.Either (Either(..))
 import Data.Map as Map