diff --git a/pyproject.toml b/pyproject.toml
index f7f14bc..d435d98 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,15 +19,17 @@ license = {file="LICENSE"}
 classifiers = [
   "Development Status :: 4 - Beta",
   "Intended Audience :: Science/Research",
-  "License :: OSI Approved :: GPL License",
-  "Operating System :: OS Independent",
+  "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+  "Operating System :: MacOS :: MacOS X",
+  "Operating System :: Microsoft :: Windows",
+  "Operating System :: POSIX :: Linux",
   "Programming Language :: Python :: 3",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: Implementation :: CPython",
-  "Topic :: Scientific/Engineering :: Physics",
   "Topic :: Scientific/Engineering :: Astronomy",
+  "Topic :: Scientific/Engineering :: Physics",
 ]
 keywords = [
   "heliophysics",