diff --git a/Project.toml b/Project.toml
index 72682b65..4d40c49a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,7 +11,7 @@ StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
 [compat]
 ForwardDiff = "^0.10.0"
-IntervalArithmetic = "^0.15.0"
+IntervalArithmetic = "0.15, 0.16"
 Polynomials = "0.5.0"
 StaticArrays = "^0.11.0"
 julia = "1"