diff --git a/pyproject.toml b/pyproject.toml
index 6441fd6..706b953 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ name = "niar"
 version = "0.1"
 description = "A small framework for building projects with Amaranth"
 authors = [{ name = "Asherah Connor", email = "ashe@kivikakk.ee" }]
-dependencies = ["amaranth >= 0.5, < 0.7"]
+dependencies = ["amaranth[builtin-yosys] >= 0.5, < 0.7"]
 requires-python = ">=3.8"
 license = { text = "BSD-2-Clause" }