diff --git a/pyproject.toml b/pyproject.toml
index fa8f232..2092d51 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,10 +39,11 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
 ]
-dynamic = ["dependencies"]
+dynamic = ["dependencies", "optional-dependencies"]
 
 [tool.setuptools]
 py-modules = ["adafruit_bme680"]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}
+optional-dependencies = {optional = {file = ["optional_requirements.txt"]}}