diff --git a/tic-tac-toe/training/yannick/yarn.lock b/tic-tac-toe/training/yannick/yarn.lock
index a690f18..c1da2f4 100644
--- a/tic-tac-toe/training/yannick/yarn.lock
+++ b/tic-tac-toe/training/yannick/yarn.lock
@@ -456,9 +456,9 @@ js-tokens@^3.0.2:
   integrity sha1-mGbfOVECEw449/mWvOtlRDIJwls=
 
 js-yaml@^3.7.0:
-  version "3.13.1"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.13.1.tgz#aff151b30bfdfa8e49e05da22e7415e9dfa37847"
-  integrity sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==
+  version "3.15.1"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.15.1.tgz#24bc95028f361cdaaa84745b06a109c4486773c0"
+  integrity sha512-S99WuO3HlhO3XN41EtYUNl9zzXjoJx7QvmipxsJVxtCBT0YHEFy+iOJhjSvrmV12nYhWpZaM8lPHkJm0yUMbag==
   dependencies:
     argparse "^1.0.7"
     esprima "^4.0.0"