diff --git a/pyproject.toml b/pyproject.toml
index dd5a130..69b1b12 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,7 @@ requires-python = ">=3.10"
 
 dependencies = [
   "numpy",
+  "openmc>=0.15"
 ]
 
 classifiers = [
@@ -29,6 +30,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Topic :: Scientific/Engineering :: Physics",
 ]