diff --git a/Project.toml b/Project.toml
index b3247df..b75eaaf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,7 +20,7 @@ SpecialFunctionsExt = "SpecialFunctions"
 Aqua = "0.8"
 ColorTypes = "0.12"
 Colors = "0.13"
-FixedPointNumbers = "0.8.2"
+FixedPointNumbers = "0.8.2, 0.9"
 LinearAlgebra = "<0.0.1, 1"
 Requires = "1"
 SpecialFunctions = "2"