diff --git a/Project.toml b/Project.toml
index 847fc84..2c4b024 100644
--- a/Project.toml
+++ b/Project.toml
@@ -29,7 +29,7 @@ ForwardDiff = "0.10"
 JLD2 = "0.5.13"
 LogExpFunctions = "0.3"
 Logging = "1"
-MixedModels = "4.26"
+MixedModels = "4.26, 5"
 ProgressLogging = "0.1.4"
 RecipesBase = "1.3"
 Reexport = "1"