diff --git a/test/downstream/Project.toml b/test/downstream/Project.toml
index 4a6cb0368..bea50f4af 100644
--- a/test/downstream/Project.toml
+++ b/test/downstream/Project.toml
@@ -53,7 +53,7 @@ StableRNGs = "1"
 SteadyStateDiffEq = "2.2"
 StochasticDelayDiffEq = "1"
 StochasticDiffEq = "6"
-Sundials = "4.11"
+Sundials = "4.11, 5"
 SymbolicIndexingInterface = "0.3"
 SymbolicUtils = "<1.6, 2, 3"
 Tables = "1"