diff --git a/pyproject.toml b/pyproject.toml
index 4afb9a16..52c8dce3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ dependencies = [
 # Install with `pip install pyxform[dev]`.
 dev = [
   "formencode==2.1.1",  # Compare XML
-  "lxml==6.0.0",        # XPath test expressions
+  "lxml==6.1.0",        # XPath test expressions
   "psutil==7.0.0",      # Process info for performance tests
   "ruff==0.12.4",        # Format and lint
 ]