diff --git a/stripe-tests.cabal b/stripe-tests.cabal
--- a/stripe-tests.cabal
+++ b/stripe-tests.cabal
@@ -1,5 +1,5 @@
 name:                stripe-tests
-version:             2.3.0
+version:             2.4.0
 synopsis:            Tests for Stripe API bindings for Haskell
 license:             MIT
 license-file:        LICENSE
@@ -25,7 +25,7 @@
   build-depends:       aeson                >= 0.8 && < 0.10 || >= 0.11 && < 1.3
                      , base                 >= 4.7   && < 5
                      , bytestring           >= 0.10  && < 0.11
-                     , free                 >= 4.10  && < 4.13
+                     , free                 >= 4.10  && < 6
                      , mtl                  >= 2.1.2 && < 2.3
                      , random               >= 1.1   && < 1.2
                      , hspec                >= 2.1.0 && < 2.5