diff --git a/.github/workflows/lint_check.yaml b/.github/workflows/lint_check.yaml
index ed042f4..6debf14 100644
--- a/.github/workflows/lint_check.yaml
+++ b/.github/workflows/lint_check.yaml
@@ -16,7 +16,7 @@ jobs:
 
       - name: lint-flake8
         run: |
-          pip install flake8==v3.8.4
+          pip install flake8
           FLAKE_DISABLE_LIST="F403,F405,W504,W503,E203"
           flake8 --max-line-length=120 --ignore=$FLAKE_DISABLE_LIST ./chat/web_demo.py
 
diff --git a/assets/solve_puzzle.png b/assets/solve_puzzle.png
new file mode 100644
index 0000000..41d3ea5
Binary files /dev/null and b/assets/solve_puzzle.png differ