diff --git a/.appveyor.yml b/.appveyor.yml
index 69989b690..1e78361fe 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -43,18 +43,22 @@ install:
 # install latest stack release
 # - curl -skL -ostack.zip http://www.stackage.org/stack/windows-x86_64
 # - 7z x stack.zip stack.exe
-# - move stack.exe stack-release.exe
-# - stack-release --version
+# - stack --version
 
 # install latest stack 4125-cabal-style-build-tools branch
+# - move stack.exe stack-release.exe
 # - set PATH=C:\Users\appveyor\AppData\Roaming\local\bin;%PATH%
 # - stack-release upgrade --git --git-branch 4125-cabal-style-build-tools
 # - copy C:\Users\appveyor\AppData\Roaming\local\bin\stack.exe C:\Users\appveyor\AppData\Roaming\local\bin\stack-4125-cabal-style-build-tools.exe
 
-# use the former
-#- copy stack-release.exe stack.exe
+# install latest stack master
+- move stack.exe stack-release.exe
+- set PATH=C:\Users\appveyor\AppData\Roaming\local\bin;%PATH%
+- stack-release upgrade --git
+- copy C:\Users\appveyor\AppData\Roaming\local\bin\stack.exe C:\Users\appveyor\AppData\Roaming\local\bin\stack-master.exe
+
 # use the latter
-- copy C:\Users\appveyor\AppData\Roaming\local\bin\stack-4125-cabal-style-build-tools.exe stack.exe
+- copy C:\Users\appveyor\AppData\Roaming\local\bin\stack-master.exe stack.exe
 
 - stack --version
 - dir