diff --git a/docs/Project.toml b/docs/Project.toml
index 130eba715..856b8bad0 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -186,7 +186,7 @@ OptimizationPRIMA = "0.3.5"
 OptimizationPolyalgorithms = "0.3.5"
 OptimizationPyCMA = "1.3"
 OptimizationQuadDIRECT = "0.3.4"
-OptimizationSciPy = "0.4.6"
+OptimizationSciPy = "0.4.6, 0.4"
 OptimizationSophia = "1.3"
 OptimizationSpeedMapping = "0.2.3"
 OrdinaryDiffEq = "6, 7"