diff --git a/constraints.txt b/constraints.txt
index 301e96c2..1f2d9e04 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -34,7 +34,7 @@ nh3==0.3.2
 packaging==26.0
 pluggy==1.6.0
 Pygments==2.19.2
-pycparser==2.23
+pycparser==3.0
 pydantic==2.12.5
 pydantic-core==2.41.5
 pytest==9.0.2