diff --git a/Project.toml b/Project.toml
index c96c84b99..58bdfc9d7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -75,7 +75,7 @@ FastClosures = "0.3.2"
 FastLevenbergMarquardt = "0.1"
 FiniteDiff = "2.24"
 FixedPointAcceleration = "0.3, 1"
-ForwardDiff = "0.10.36"
+ForwardDiff = "0.10.36, 1"
 Hwloc = "3"
 InteractiveUtils = "<0.0.1, 1"
 LeastSquaresOptim = "0.8.5"