diff --git a/Project.toml b/Project.toml
index e33c84cf355..2af1687a529 100644
--- a/Project.toml
+++ b/Project.toml
@@ -55,7 +55,7 @@ MPI = "0.19"
 MuladdMacro = "0.2.2"
 Octavian = "0.3.5"
 OffsetArrays = "1.3"
-P4est = "0.3.0"
+P4est = "0.3.0, 0.4"
 Polyester = "0.3.4, 0.5, 0.6"
 RecipesBase = "1.1"
 Reexport = "1.0"