diff --git a/.travis.yml b/.travis.yml
index 852da6c..6c84c70 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -41,6 +41,7 @@ install:
 - cabal install purescript-0.13.6
 - npm install -g bower
 script:
+- cp cabal.project.ci cabal.project.local
 - cabal build exe:zephyr
 - cabal run -f test-with-cabal zephyr-test -- -m generators -m dceEval -m dceExpr -m TestLib
 before_deploy:
@@ -48,7 +49,7 @@ before_deploy:
 deploy:
   provider: releases
   api_key:
-    secure: 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
+    secure: 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
   file_glob: true
   file:
     - bundle/*.tar.gz
diff --git a/appveyor.yml b/appveyor.yml
index 1e13d56..0de3467 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -21,11 +21,10 @@ install:
   - cabal --version
   - cabal update -v
 build_script:
-  - ps: |
-      # TODO: enable -Werror
-      cabal build exe:zephyr
-      cabal build -f test-with-cabal zephyr-test
-  - ps: bash bundle/build.sh win64
+  - cp cabal.project.ci cabal.project.local
+  - cabal build exe:zephyr
+  - cabal build -f test-with-cabal zephyr-test
+  - bash bundle/build.sh win64
 test_script:
   # TODO: not testing `-m TestLib`
   - cabal run -f test-with-cabal zephyr-test -- -m generators -m dceEval -m dceExpr
@@ -37,8 +36,8 @@ artifacts:
 deploy:
   - provider: GitHub
     auth_token:
-      secure: gHIxz3scq98LOgduo20IiKNFcLOmcKHHKH0qI4/z4TawrmbR+MV/rb1mG9GCXf7M
-    artifact: x86-64-windows.tar.gz,x86-64-windows.sha
+      secure: x7NfETL6i3LCuKpv9WZf4k/RmnZTr5glvheuBbl7FvFhtqDhc4YynBufhbjYKgLC
+    artifact: x86_64-windows.tar.gz,x86_64-windows.sha
     draft: true
     force_update: true
     on:
diff --git a/bundle/build.sh b/bundle/build.sh
index 3a3a12a..a59ae54 100755
--- a/bundle/build.sh
+++ b/bundle/build.sh
@@ -15,7 +15,7 @@ case $1 in
   "linux")
     OS_NAME="x86_64-linux";;
   "osx")
-    OS_NAME="x86_64-darwin";;
+    OS_NAME="x86_64-osx";;
   "win64")
     OS_NAME="x86_64-windows";;
   *)
diff --git a/cabal.project.ci b/cabal.project.ci
new file mode 100644
index 0000000..7e76397
--- /dev/null
+++ b/cabal.project.ci
@@ -0,0 +1,3 @@
+package zephyr
+  ghc-options: -Werror
+