diff --git a/what4/what4.cabal b/what4/what4.cabal
index eca9b5c6..c0377d32 100644
--- a/what4/what4.cabal
+++ b/what4/what4.cabal
@@ -422,7 +422,7 @@ test-suite solver_parsing_tests
                , exceptions
                , io-streams
                , lumberjack
-               , tasty-sugar >= 1.3 && < 1.4
+               , tasty-sugar >= 1.3 && < 2.1
                , text
 
 test-suite what4-serialize-tests