diff --git a/docs/Project.toml b/docs/Project.toml
index c5a17ef65e..b655328fdb 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -75,7 +75,7 @@ OptimizationEvolutionary = "0.4"
 OptimizationNLopt = "0.3"
 OptimizationOptimJL = "0.4"
 OptimizationOptimisers = "0.3"
-OrdinaryDiffEqBDF = "1"
+OrdinaryDiffEqBDF = "1, 2"
 OrdinaryDiffEqDefault = "1"
 OrdinaryDiffEqRosenbrock = "1"
 OrdinaryDiffEqSDIRK = "1"