diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a2be9e2..401c293 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,7 +1,8 @@
+---
 default_language_version:
   python: python
 repos:
--   repo: https://github.com/pre-commit/pre-commit-hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.5.0
     hooks:
     - id: check-merge-conflict
@@ -15,16 +16,20 @@ repos:
       exclude: ChangeLog-spell-corrected.diff
     - id: check-json
       exclude: mathics_scanner/data/character-tables.json
--   repo: https://github.com/pycqa/isort
+  - repo: https://github.com/pycqa/isort
     rev: 5.13.2
     hooks:
       - id: isort
         stages: [pre-commit]
         args: ["--profile", "black"]
--   repo: https://github.com/psf/black
+  - repo: https://github.com/psf/black
     rev: 25.11.0
     hooks:
     - id: black
       language_version: python3
       stages: [pre-commit]
       exclude: version.py
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: 0.31.0  # Use the latest version
+    hooks:
+      - id: check-github-workflows
diff --git a/.yamllint b/.yamllint
new file mode 100644
index 0000000..1052c4f
--- /dev/null
+++ b/.yamllint
@@ -0,0 +1,4 @@
+# -*- conf -*-
+# .yamllint configuration file
+rules:
+  line-length: disable
diff --git a/mathics_scanner/location.py b/mathics_scanner/location.py
index 1f309bb..1153692 100644
--- a/mathics_scanner/location.py
+++ b/mathics_scanner/location.py
@@ -75,6 +75,9 @@ def get_location_file_line(
         filename = code.co_filename
         line_number = code.co_firstlineno
     else:
-        filename = MATHICS3_PATHS[loc.container]
+        try:
+            filename = MATHICS3_PATHS[loc.container]
+        except IndexError:
+            filename = "???"
         line_number = loc.start_line
     return filename, line_number
diff --git a/pyproject.toml b/pyproject.toml
index 0eec94d..0d3bf7a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
@@ -45,6 +44,8 @@ Homepage = "https://mathics.org/"
 
 [project.optional-dependencies]
 dev = [
+    "check-jsonschema",
+    "pre-commit",
     "pytest",
 ]
 full = [