diff --git a/docs/Project.toml b/docs/Project.toml
index bca0893bd..7c8f182e4 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -35,7 +35,7 @@ CSV = "0.10"
 ComponentArrays = "0.13, 0.14, 0.15"
 DataDeps = "0.7"
 DataFrames = "1"
-DiffEqFlux = "2"
+DiffEqFlux = "2, 4"
 DifferentialEquations = "7.6.0"
 Distances = "0.10.7"
 Distributions = "0.25.78"