diff --git a/src/update.py b/src/update.py
index 1014406..1377a1d 100644
--- a/src/update.py
+++ b/src/update.py
@@ -3,11 +3,17 @@ import os
 import subprocess
 import config
 
+def safe_literal_eval(node):
+    try:
+        return ast.literal_eval(node)
+    except ValueError:
+        return None
+    
 def get_assignments(filename):
     with open(filename) as f:
         tree = ast.parse(f.read(), filename)
 
-    assignments = {node.targets[0].id: ast.literal_eval(node.value) for node in ast.walk(tree) if isinstance(node, ast.Assign)}
+    assignments = {node.targets[0].id: safe_literal_eval(node.value) for node in ast.walk(tree) if isinstance(node, ast.Assign)}
     return assignments