diff --git a/Project.toml b/Project.toml
index 938aaffbe..643907056 100644
--- a/Project.toml
+++ b/Project.toml
@@ -75,7 +75,7 @@ KernelDensity = "0.5"
 LaTeXStrings = "1"
 Measurements = "2"
 NLSolversBase = "7"
-Optim = "0.19,0.20, 0.21, 0.22"
+Optim = "0.19,0.20, 0.21, 0.22, 1.0"
 PDMats = "0.9, 0.10"
 ParallelProcessingTools = "0.4"
 Parameters = "0.12"