diff --git a/Project.toml b/Project.toml
index a22c5ef..8a200df 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,7 +11,7 @@ ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 RobustPmap = "27aeedcb-f738-516b-a0b8-3211cf1146e5"
 
 [compat]
-AffineInvariantMCMC = "1"
+AffineInvariantMCMC = "1, 0.6"
 BlackBoxOptim = "0.5, 0.6"
 DataFrames = "0.21, 0.22"
 Distributions = "0.24, 0.25"