diff --git a/pyproject.toml b/pyproject.toml
index c5f94d7..fbfb51a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,11 +21,13 @@ readme = "README.md"
 license = { file = "LICENSE" }
 requires-python = ">=3.10,<4"
 classifiers = [
+  "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "License :: OSI Approved :: Apache Software License",
 ]
 keywords = ["slack", "wrapper", "helper", "viewer"]