diff --git a/backend/data/questions/single-number.yaml b/backend/data/questions/single-number.yaml
index 3650ff4..88d7f3f 100644
--- a/backend/data/questions/single-number.yaml
+++ b/backend/data/questions/single-number.yaml
@@ -7,7 +7,7 @@ categories:
   - arrays
   - math
 patterns:
-  - greedy
+  - bit-manipulation
 
 function_signature: "def single_number(nums: list[int]) -> int:"