diff --git a/Project.toml b/Project.toml
index def8eb6..bcd955d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -13,8 +13,8 @@ Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 
 [compat]
-GAP = "^0"
-Singular = "0.4 - 0"
+GAP = "0.4.4 - 0.5"
+Singular = "0.4 - 0.5"
 julia = "1.3"
 
 [extras]