diff --git a/setup.py b/setup.py
old mode 100755
new mode 100644
index 54cbf9841fb123d52ad9129b8bdf06445b1429c1..2faf49316df8f7d83660ba7f852a93f8aff8a57f
--- a/setup.py
+++ b/setup.py
@@ -28,10 +28,11 @@ setup_args = dict(
     ],
 
     install_requires = [
-        'numpy',
-        'scipy',
         'h5py',
         'matplotlib',
+        'numpy',
+        'pyyaml',
+        'scipy',
     ],
 
     packages = find_packages(
diff --git a/tox.ini b/tox.ini
index c227884c0e80908cf5cca9992c113a7bdc5ce171..b8469d90273f0ff607b5dc02f368adf4185241f5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,7 @@ deps =
     pytest-xdist
     pytest-benchmark
     matplotlib
+    pyyaml
     numpy
     scipy
 commands=python -m gwinc.test