diff --git a/appveyor.yml b/appveyor.yml
index 532c85d4713b2acabe3630e01cdf67573fe6f57c..8436e685ae209ca86fbe9eff6b6ff4226012f0fd 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,8 +1,9 @@
 install:
   # Using '-y' and 'refreshenv' as a workaround to:
   # https://github.com/haskell/cabal/issues/3687
-  - choco install -y cabal
-  - choco install -y ghc --version 8.0.2
+  - choco source add -n mistuke -s https://www.myget.org/F/mistuke/api/v2
+  - choco install -y ghc --version 8.0.2 --ignore-dependencies
+  - choco install -y cabal-head -pre
   - refreshenv
   # See http://help.appveyor.com/discussions/problems/6312-curl-command-not-found#comment_42195491
   # NB: Do this after refreshenv, otherwise it will be clobbered!
diff --git a/cabal-testsuite/cabal-testsuite.cabal b/cabal-testsuite/cabal-testsuite.cabal
index 858fc75bb1594eded0291a7f43439d8f7d8cc639..5835ea6c1582da2e7f0bf2846fee42f291eda110 100644
--- a/cabal-testsuite/cabal-testsuite.cabal
+++ b/cabal-testsuite/cabal-testsuite.cabal
@@ -64,7 +64,7 @@ executable cabal-tests
   build-depends:
     async,
     base,
-    Cabal >= 2.3,
+    Cabal == 2.4.0.0,
     clock,
     filepath,
     process,
@@ -75,5 +75,5 @@ executable cabal-tests
   default-language: Haskell2010
 
 custom-setup
-  setup-depends: Cabal >= 1.25,
+  setup-depends: Cabal == 2.4.0.0,
                  base