diff --git a/BUILD.bazel b/BUILD.bazel
index 1f0ff81..eb2ad63 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -6,6 +6,12 @@ project("github-tools")
 haskell_library(
     name = "github-tools",
     srcs = glob(["src/**/*.*hs"]),
+    compiler_flags = [
+        "-j4",
+        "-Wall",
+        "-Werror",
+        "-Wno-unused-imports",
+    ],
     prebuilt_dependencies = [
         "base",
         "bytestring",
@@ -35,7 +41,20 @@ haskell_library(
 
 haskell_test(
     name = "test",
+    timeout = "long",
     srcs = glob(["test/**/*.*hs"]),
+    args = [
+        "-j4",
+        "+RTS",
+        "-N4",
+    ],
+    compiler_flags = [
+        "-threaded",
+        "-rtsopts",
+        "-Wall",
+        "-Werror",
+        "-Wno-unused-imports",
+    ],
     main_file = "test/testsuite.hs",
     prebuilt_dependencies = ["base"],
     src_strip_prefix = "test",
diff --git a/appveyor.yml b/appveyor.yml
index c4cbc9b..5d6fdc5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,7 +3,7 @@ cache:
 - '%APPDATA%\ghc'
 
 install:
-- choco install ghc
+- choco install ghc --version 8.2.2
 - refreshenv
 
 build_script:
diff --git a/src/GitHub/Types/Base/Commit.hs b/src/GitHub/Types/Base/Commit.hs
index 4af5d97..f001982 100644
--- a/src/GitHub/Types/Base/Commit.hs
+++ b/src/GitHub/Types/Base/Commit.hs
@@ -18,7 +18,7 @@ import           GitHub.Types.Base.User
 data Commit = Commit
     { commitSha   :: Text
     , commitUser  :: User
-    , commitRepo  :: Repository
+    , commitRepo  :: Maybe Repository
     , commitLabel :: Text
     , commitRef   :: Text
     } deriving (Eq, Show, Read)
diff --git a/src/GitHub/Types/Base/DeploymentPayload.hs b/src/GitHub/Types/Base/DeploymentPayload.hs
index 7381b94..e169e4b 100644
--- a/src/GitHub/Types/Base/DeploymentPayload.hs
+++ b/src/GitHub/Types/Base/DeploymentPayload.hs
@@ -4,7 +4,7 @@ module GitHub.Types.Base.DeploymentPayload where
 
 import           Control.Applicative       ((<$>))
 import           Data.Aeson                (FromJSON (..), ToJSON (..), object)
-import           Data.Aeson.Types          (Value (..), (.:), (.=))
+import           Data.Aeson.Types          (Value (..), (.:?), (.=))
 import           Data.Text                 (Text)
 import           Data.Text.Arbitrary       ()
 import           Test.QuickCheck.Arbitrary (Arbitrary (..))
@@ -13,12 +13,12 @@ import           Test.QuickCheck.Arbitrary (Arbitrary (..))
 -- DeploymentPayload
 
 data DeploymentPayload = DeploymentPayload
-    { deploymentPayloadWebUrl :: Text
+    { deploymentPayloadWebUrl :: Maybe Text
     } deriving (Eq, Show, Read)
 
 instance FromJSON DeploymentPayload where
     parseJSON (Object x) = DeploymentPayload
-        <$> x .: "web_url"
+        <$> x .:? "web_url"
 
     parseJSON _ = fail "DeploymentPayload"
 
diff --git a/src/GitHub/Types/Base/PullRequest.hs b/src/GitHub/Types/Base/PullRequest.hs
index b61db2c..bc045e0 100644
--- a/src/GitHub/Types/Base/PullRequest.hs
+++ b/src/GitHub/Types/Base/PullRequest.hs
@@ -11,6 +11,7 @@ import           Test.QuickCheck.Arbitrary          (Arbitrary (..))
 
 import           GitHub.Types.Base.Commit
 import           GitHub.Types.Base.DateTime
+import           GitHub.Types.Base.Label
 import           GitHub.Types.Base.Milestone
 import           GitHub.Types.Base.PullRequestLinks
 import           GitHub.Types.Base.Team
@@ -39,6 +40,7 @@ data PullRequest = PullRequest
     , pullRequestHtmlUrl             :: Text
     , pullRequestId                  :: Int
     , pullRequestIssueUrl            :: Text
+    , pullRequestLabels              :: [Label]
     , pullRequestLinks               :: PullRequestLinks
     , pullRequestLocked              :: Bool
     , pullRequestMaintainerCanModify :: Bool
@@ -87,6 +89,7 @@ instance FromJSON PullRequest where
         <*> x .: "html_url"
         <*> x .: "id"
         <*> x .: "issue_url"
+        <*> x .: "labels"
         <*> x .: "_links"
         <*> x .: "locked"
         <*> x .: "maintainer_can_modify"
@@ -136,6 +139,7 @@ instance ToJSON PullRequest where
         , "html_url"              .= pullRequestHtmlUrl
         , "id"                    .= pullRequestId
         , "issue_url"             .= pullRequestIssueUrl
+        , "labels"                .= pullRequestLabels
         , "_links"                .= pullRequestLinks
         , "locked"                .= pullRequestLocked
         , "maintainer_can_modify" .= pullRequestMaintainerCanModify
@@ -208,3 +212,4 @@ instance Arbitrary PullRequest where
         <*> arbitrary
         <*> arbitrary
         <*> arbitrary
+        <*> arbitrary
diff --git a/test/GitHub/Types/BaseSpec.hs b/test/GitHub/Types/BaseSpec.hs
index a493e53..a18ab87 100644
--- a/test/GitHub/Types/BaseSpec.hs
+++ b/test/GitHub/Types/BaseSpec.hs
@@ -2,9 +2,7 @@
 {-# LANGUAGE Trustworthy         #-}
 module GitHub.Types.BaseSpec where
 
-import           Control.Applicative ((<$>))
-import           Data.Aeson          (FromJSON, ToJSON, decode, encode)
-import           GHC.Generics        (Generic)
+import           Data.Aeson        (decode, encode)
 import           Test.Hspec
 import           Test.QuickCheck
 
@@ -13,7 +11,7 @@ import           GitHub.Types.Base
 
 spec :: Spec
 spec =
-  describe "identity JSON conversion" $ do
+  describe "identity JSON conversion" $ parallel $ do
     it "Author"             $ property $ \(x :: Author            ) -> decode (encode x) `shouldBe` Just x
     it "Branch"             $ property $ \(x :: Branch            ) -> decode (encode x) `shouldBe` Just x
     it "Change"             $ property $ \(x :: Change            ) -> decode (encode x) `shouldBe` Just x
diff --git a/test/GitHub/Types/EventsSpec.hs b/test/GitHub/Types/EventsSpec.hs
index b2b4fb7..ebaf188 100644
--- a/test/GitHub/Types/EventsSpec.hs
+++ b/test/GitHub/Types/EventsSpec.hs
@@ -11,7 +11,7 @@ import           GitHub.Types.Events
 
 spec :: Spec
 spec =
-  describe "identity JSON conversion" $ do
+  describe "identity JSON conversion" $ parallel $ do
     it "CommitCommentEvent"            $ property $ \(x :: CommitCommentEvent           ) -> decode (encode x) `shouldBe` Just x
     it "CreateEvent"                   $ property $ \(x :: CreateEvent                  ) -> decode (encode x) `shouldBe` Just x
     it "DeleteEvent"                   $ property $ \(x :: DeleteEvent                  ) -> decode (encode x) `shouldBe` Just x