diff --git a/docs/Project.toml b/docs/Project.toml
index bd67a099f..8d04095d9 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -94,4 +94,4 @@ SparseConnectivityTracer = "1"
 SparseMatrixColorings = "0.4"
 StaticArrays = "1"
 SteadyStateDiffEq = "2"
-Sundials = "4.11"
+Sundials = "4.11, 5"