diff --git a/Project.toml b/Project.toml
index a5a44c0e3..1175004a1 100644
--- a/Project.toml
+++ b/Project.toml
@@ -17,7 +17,7 @@ StatsFuns = "4c63d2b9-4356-54db-8cca-17b64c39e42c"
 
 [compat]
 FillArrays = "0.8"
-PDMats = ">=0.9.12"
+PDMats = "0.9.12"
 QuadGK = "2"
 SpecialFunctions = "0.8, 0.9, 0.10"
 StatsBase = "0.32"