diff --git a/benchmarks/AstroChem/Project.toml b/benchmarks/AstroChem/Project.toml
index 7284898b5..5e36a767e 100644
--- a/benchmarks/AstroChem/Project.toml
+++ b/benchmarks/AstroChem/Project.toml
@@ -20,3 +20,4 @@ LinearSolve = "2"
 LSODA = "0.7"
 ODEInterface = "0.5"
 OrdinaryDiffEq = "6"
+Sundials = "4"