diff --git a/pdm.lock b/pdm.lock
index 9cd3446..78eb2ec 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -268,6 +268,7 @@ summary = "Python style guide checker"
 [[package]]
 name = "pycparser"
 version = "2.21"
+requires_python = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 summary = "C parser in Python"
 
 [[package]]
@@ -538,7 +539,7 @@ dependencies = [
 
 [metadata]
 lock_version = "3.1"
-content_hash = "sha256:741030b205d43ca3ee40df89c6085d5e582f37e5b5100442e0608e5be4e728cc"
+content_hash = "sha256:4cfe27ec20e9923c09bc84e34df175d2c9b744e87144ddf84fd660eef2ade521"
 
 [metadata.files]
 "altgraph 0.17.2" = [