diff --git a/services/lex/pyproject.toml b/services/lex/pyproject.toml
index 6a34fe4..dfedb80 100644
--- a/services/lex/pyproject.toml
+++ b/services/lex/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "pytest==9.0.3",
+    "pytest==9.1.1",
     "pytest-cov==7.1.0",
     "mypy==1.14.1",
     "ruff==0.8.6",