diff --git a/pyproject.toml b/pyproject.toml
index 0b56ca4f..f42d07ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ dev = [
     "pytest",
     "pytest-cov",
     "pytest-mock",
-    "substratools~=0.22.0",
+    "substratools~=0.22.0a2",
     "black",
     "flake8",
     "isort",