diff --git a/src/setup.cfg b/src/setup.cfg
index a2bdfedd..ed093254 100644
--- a/src/setup.cfg
+++ b/src/setup.cfg
@@ -38,6 +38,9 @@ install_requires =
     yubikey-manager >= 4.0.0
     pathvalidate
 
+[options.package_data]
+* = *.pem
+
 # used during pip install .[test]
 [options.extras_require]
 test = pre-commit