diff --git a/Project.toml b/Project.toml
index 12c1be4..21b7318 100644
--- a/Project.toml
+++ b/Project.toml
@@ -21,7 +21,7 @@ OptimizationOptimJL = "0.1"
 OrdinaryDiffEq = "6"
 Pkg = "1"
 Random = "1"
-RecursiveArrayTools = "2"
+RecursiveArrayTools = "2, 3"
 Requires = "1.0"
 ReverseDiff = "1"
 SafeTestsets = "0.1"