diff --git a/setup.cfg b/setup.cfg
index 724c7a0..3d87885 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,6 +32,7 @@ install_requires =
     importlib-metadata; python_version < "3.8"
     inators
     picire==21.8
+    psutil < 5.9.6  # FIXME: requirement of picire; PyPy does not expose PyErr_SetExcFromWindowsErrWithFilenameObject on Windows, waiting for psutil workaround
     xson
 
 [options.entry_points]