diff --git a/Project.toml b/Project.toml
index 569d9ff9..b0c6076f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,6 +11,8 @@ PETSc_jll = "8fa3689e-f0b9-5420-9873-adf6ccf46f2d"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 
 [compat]
+MPI = "0.15, 0.16, 0.17, 0.18, 0.19"
+PETSc_jll = "3.15.2"
 julia = "1.3"
 
 [extras]