diff --git a/pyproject.toml b/pyproject.toml
index 7c30ac0..2e6464a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ dependencies = [
     'pandas',
     'matplotlib',
     'pytest',
+    'pytest-cov',
     'dill',
     'openpyxl',
     'nrelpy',
@@ -66,4 +67,10 @@ doc = [
 ]
 
 [tool.setuptools.packages.find]
-include = ['osier']
\ No newline at end of file
+include = ['osier']
+
+[tool.pytest.ini_options]
+addopts = "--cov=osier tests"
+
+[tool.coverage.report]
+fail_under = 75
\ No newline at end of file