diff --git a/pyproject.toml b/pyproject.toml
index c7bccad6..ffd7be5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ classifiers = [
 ]
 dependencies = [
 	"numpy>=1.18",
-	"sly~=0, >= 0.4"
+	"sly==0.*, >= 0.4"
 ]
 
 [project.optional-dependencies]