diff --git a/Project.toml b/Project.toml
index 545d84c6a..fae730da8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -29,7 +29,7 @@ MacroTools = "0.5"
 ModelingToolkit = "7"
 Nemo = "0.24, 0.25, 0.26, 0.27"
 Primes = "0.5"
-Singular = "0.4, 0.5, 0.6, 0.7, 0.8"
+Singular = "0.4, 0.5, 0.6, 0.7, 0.8, 0.9"
 SpecialFunctions = "1"
 TestSetExtensions = "2"
 julia = "1.5"