diff --git a/pyproject.toml b/pyproject.toml
index 2be7df4e..2fc1f374 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,25 @@ maintainers = [
     { name = "TKET development team", email = "tket-support@quantinuum.com" },
 ]
 
+classifiers = [
+    "Development Status :: 3 - Alpha",
+
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "Topic :: Software Development :: Compilers",
+
+    "License :: OSI Approved :: Apache Software License",
+
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3 :: Only",
+]
+
 dependencies = [
     "graphviz >=0.20.1,<0.21",
     "networkx >=3.2.1,<4",