diff --git a/rollbar-hs.cabal b/rollbar-hs.cabal
index 9c9b5c5..d603867 100644
--- a/rollbar-hs.cabal
+++ b/rollbar-hs.cabal
@@ -51,15 +51,15 @@ library
   hs-source-dirs:
       src
   build-depends:
-      aeson >= 2.2
+      aeson >=1.1
     , base >=4.9
     , bytestring >=0.10
     , case-insensitive >=1.2
     , hostname >=1.0
     , http-client >=0.5
     , http-conduit >=2.2
-    , http-types >=0.9
-    , network >=2.6
+    , http-types >=0.8.6
+    , network >=2.6.3
     , text >=1.2
     , time >=1.6
     , unordered-containers >=0.2
@@ -80,14 +80,14 @@ test-suite doc-test
       test
   build-depends:
       QuickCheck >=2.9
-    , aeson >=1.0
-    , base >=4.9
-    , bytestring >=0.10
-    , case-insensitive >=1.2
+    , aeson
+    , base
+    , bytestring
+    , case-insensitive
     , hashable
     , hspec >=2.4
     , hspec-golden-aeson >=0.2
     , rollbar-hs
-    , text >=1.2
-    , unordered-containers >=0.2
+    , text
+    , unordered-containers
   default-language: Haskell2010
diff --git a/src/Rollbar/Item.hs b/src/Rollbar/Item.hs
index 1519bd5..3272ebd 100644
--- a/src/Rollbar/Item.hs
+++ b/src/Rollbar/Item.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -197,10 +198,17 @@ data Item a headers
         }
     deriving (Eq, Generic, Show)
 
+#if MIN_VERSION_aeson(2, 2, 0)
 itemKVs
     :: (KeyValue e kv, RemoveHeaders headers, ToJSON v)
     => Item v headers
     -> [kv]
+#else
+itemKVs
+    :: (KeyValue kv, RemoveHeaders headers, ToJSON v)
+    => Item v headers
+    -> [kv]
+#endif
 itemKVs Item{accessToken, itemData} =
     [ "access_token" .= accessToken
     , "data" .= itemData
diff --git a/src/Rollbar/Item/Body.hs b/src/Rollbar/Item/Body.hs
index 89ba807..43bb976 100644
--- a/src/Rollbar/Item/Body.hs
+++ b/src/Rollbar/Item/Body.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -33,7 +34,7 @@ import Data.Aeson
     , (.=)
     )
 import Data.Aeson.Encoding (pair)
-import Data.Aeson.Types    (typeMismatch)
+import Data.Aeson.Types    (explicitParseField, typeMismatch)
 import Data.String         (IsString)
 
 import GHC.Generics (Generic)
@@ -52,16 +53,21 @@ data Body arbitrary
         }
     deriving (Eq, Generic, Show)
 
+#if MIN_VERSION_aeson(2, 2, 0)
 bodyKVs :: (KeyValue e kv, ToJSON v) => Body v -> [kv]
+#else
+bodyKVs :: (KeyValue kv, ToJSON v) => Body v -> [kv]
+#endif
 bodyKVs Message{messageBody, messageData} =
     [ "body" .= messageBody
     , "data" .= messageData
     ]
 
 instance FromJSON arbitrary => FromJSON (Body arbitrary) where
-    parseJSON (Object o') = do
-        o <- o' .: "message"
-        Message <$> o .: "body" <*> o .: "data"
+    parseJSON (Object o') = explicitParseField parseMessage o' "message"
+        where
+            parseMessage (Object o) = Message <$> o .: "body" <*> o .: "data"
+            parseMessage v = typeMismatch "Body arbitrary (message)" v
     parseJSON v = typeMismatch "Body arbitrary" v
 
 instance ToJSON arbitrary => ToJSON (Body arbitrary) where
diff --git a/src/Rollbar/Item/MissingHeaders.hs b/src/Rollbar/Item/MissingHeaders.hs
index b7f43a2..1e799e6 100644
--- a/src/Rollbar/Item/MissingHeaders.hs
+++ b/src/Rollbar/Item/MissingHeaders.hs
@@ -64,7 +64,11 @@ instance FromJSON (MissingHeaders headers) where
 instance RemoveHeaders headers => ToJSON (MissingHeaders headers) where
     toJSON = object . catMaybes . requestHeadersKVs . removeHeaders
 
+#if MIN_VERSION_aeson(2, 2, 0)
 requestHeadersKVs :: forall e kv. KeyValue e kv => RequestHeaders -> [Maybe kv]
+#else
+requestHeadersKVs :: forall kv. KeyValue kv => RequestHeaders -> [Maybe kv]
+#endif
 requestHeadersKVs = fmap go
     where
     go :: Header -> Maybe kv
diff --git a/src/Rollbar/Item/Request.hs b/src/Rollbar/Item/Request.hs
index 6f340b1..7ffb1ef 100644
--- a/src/Rollbar/Item/Request.hs
+++ b/src/Rollbar/Item/Request.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -97,7 +98,11 @@ instance ToJSON Get where
     toJSON (Get q) = object . catMaybes . queryKVs $ q
     toEncoding (Get q) = pairs . mconcat . catMaybes . queryKVs $ q
 
+#if MIN_VERSION_aeson(2, 2, 0)
 queryKVs :: forall e kv. KeyValue e kv => Query -> [Maybe kv]
+#else
+queryKVs :: forall kv. KeyValue kv => Query -> [Maybe kv]
+#endif
 queryKVs = fmap go
     where
     go :: (BS.ByteString, Maybe BS.ByteString) -> Maybe kv
@@ -150,7 +155,11 @@ instance ToJSON IP where
     toJSON (IP ip) = toJSON (show ip)
     toEncoding (IP ip) = toEncoding (show ip)
 
+#if MIN_VERSION_aeson(2, 2, 0)
 requestKVs :: (KeyValue e kv, RemoveHeaders headers) => Request headers -> [kv]
+#else
+requestKVs :: (KeyValue kv, RemoveHeaders headers) => Request headers -> [kv]
+#endif
 requestKVs Request{get, headers, method, queryString, rawBody, url, userIP} =
     [ "body" .= rawBody
     , "GET" .= get
diff --git a/src/Rollbar/Item/Server.hs b/src/Rollbar/Item/Server.hs
index 4efb959..0bff0b0 100644
--- a/src/Rollbar/Item/Server.hs
+++ b/src/Rollbar/Item/Server.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -57,7 +58,11 @@ data Server
         }
     deriving (Eq, Generic, Show)
 
+#if MIN_VERSION_aeson(2, 2, 0)
 serverKVs :: KeyValue e kv => Server -> [Maybe kv]
+#else
+serverKVs :: KeyValue kv => Server -> [Maybe kv]
+#endif
 serverKVs Server{branch, host, root, serverCodeVersion} =
     [ ("host" .=) <$> host
     , ("root" .=) <$> root