diff --git a/build/appveyor/MSVC-appveyor-install.bat b/build/appveyor/MSVC-appveyor-install.bat
index bc4655a..09b7cc4 100644
--- a/build/appveyor/MSVC-appveyor-install.bat
+++ b/build/appveyor/MSVC-appveyor-install.bat
@@ -56,7 +56,8 @@
             tornado ^
             twisted                       || EXIT /B
 
-cinst -y ghc                              || EXIT /B
+cinst -y cabal --version 2.4.1.0          || EXIT /B
+cinst -y ghc --version 8.6.5              || EXIT /B
 
 :: Adobe Flex SDK 4.6 for ActionScript
 MKDIR "C:\Adobe\Flex\SDK\4.6"             || EXIT /B