diff --git a/docs/Project.toml b/docs/Project.toml
index c5a17ef65e..4eb2561e87 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -81,7 +81,7 @@ OrdinaryDiffEqRosenbrock = "1"
 OrdinaryDiffEqSDIRK = "1"
 OrdinaryDiffEqTsit5 = "1"
 OrdinaryDiffEqVerner = "1"
-PEtab = "3.5"
+PEtab = "3.5, 4"
 Plots = "1.40"
 QuasiMonteCarlo = "0.3"
 SciMLBase = "2.46"