diff --git a/niar/__init__.py b/niar/__init__.py
index b52fcf9..f1888ec 100644
--- a/niar/__init__.py
+++ b/niar/__init__.py
@@ -17,7 +17,7 @@ def cli(np: Project):
             "build", help="build the design, and optionally program it"
         ),
     )
-    if getattr(np, "cxxrtl_targets"):
+    if hasattr(np, "cxxrtl_targets"):
         cxxrtl.add_arguments(
             np, subparsers.add_parser("cxxrtl", help="run the C++ simulator tests")
         )
diff --git a/pyproject.toml b/pyproject.toml
index 0a3ffb3..6441fd6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,18 +2,14 @@
 name = "niar"
 version = "0.1"
 description = "A small framework for building projects with Amaranth"
-authors = [
-    {name = "Asherah Connor", email = "ashe@kivikakk.ee"},
-]
-dependencies = [
-    "amaranth >= 0.4.5, < 0.6",
-]
+authors = [{ name = "Asherah Connor", email = "ashe@kivikakk.ee" }]
+dependencies = ["amaranth >= 0.5, < 0.7"]
 requires-python = ">=3.8"
-license = {text = "BSD-2-Clause"}
+license = { text = "BSD-2-Clause" }
 
 [project.optional-dependencies]
 build = [
-    "amaranth-boards",  # for test
+    "amaranth-boards", # for test
 ]
 
 [project.urls]