diff --git a/Project.toml b/Project.toml
index 92cf54e275..03e15ee4ed 100644
--- a/Project.toml
+++ b/Project.toml
@@ -28,7 +28,7 @@ DiffEqSensitivity = "6.5"
 Distributions = "0.23"
 Flux = "0.10.1"
 ForwardDiff = "0.10"
-Optim = "0.20, 0.21"
+Optim = "0.20, 0.21, 0.22"
 Reexport = "0.2"
 StochasticDiffEq = "6.13"
 Tracker = "0.2"