diff --git a/pyproject.toml b/pyproject.toml
index d92d3ac4..184ddbea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ authors = [
 ]
 description = "Python Input and Output Library for Quantum Chemistry"
 readme = "README.rst"
-license = {file = "LICENSE"}
+license = {file = "LICENSE.txt"}
 requires-python = ">=3.9"
 classifiers = [
     "Development Status :: 3 - Alpha",
@@ -21,10 +21,12 @@ classifiers = [
     "Operating System :: MacOS",
     "Operating System :: Microsoft :: Windows",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Topic :: File Formats",
     "Topic :: Scientific/Engineering :: Physics",
     "Topic :: Scientific/Engineering :: Chemistry",
 ]