diff --git a/test/Project.toml b/test/Project.toml
index adb8222..890f39c 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -1,6 +1,7 @@
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 Downloads = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
+MPI = "da04e1cc-30fd-572f-bb4f-1f8673147195"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 ReadVTK = "dc215faf-f008-4882-a9f7-a79a826fadc3"
@@ -11,6 +12,7 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 [compat]
 Documenter = "0.27, 1"
 Downloads = "1"
+MPI = "0.20.6"
 OrdinaryDiffEq = "6"
 ReadVTK = "0.1, 0.2"
 Trixi = "0.5, 0.6, 0.7, 0.8, 0.9"