diff --git a/pyproject.toml b/pyproject.toml
index dc08634e4a..9a94a00113 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ classifiers = [
   "Operating System :: POSIX :: Linux",
   "Operating System :: Microsoft :: Windows",
   "Topic :: Software Development :: Libraries :: Python Modules",
+  "License :: OSI Approved :: Apache Software License",
 ]
 
 [project.optional-dependencies]