diff --git a/docs/Project.toml b/docs/Project.toml
index 8f6fc2a7..5a3571de 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -15,5 +15,5 @@ Distributions = "0.25"
 Documenter = "1"
 FiniteDiff = "2"
 ForwardDiff = "0.10"
-Integrals = "3"
+Integrals = "3, 4"
 Zygote = "0.6"