diff --git a/pyproject.toml b/pyproject.toml
index 14c7f31..fe61e86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,8 +8,9 @@ packages = [{ include = "pganec", from = "src" }]
 
 
 [tool.poetry.dependencies]
-python = "^>=.8"
+python = ">=3.8.1,<4.0.0"
 pyyaml = "^6.0"
+textual = "^3.3.0"
 
 
 [build-system]