diff --git a/microblog_bench/worker/requirements.txt b/microblog_bench/worker/requirements.txt
index 69c063b..489ec8e 100644
--- a/microblog_bench/worker/requirements.txt
+++ b/microblog_bench/worker/requirements.txt
@@ -1,4 +1,4 @@
 pkg-resources==0.0.0
-PyYAML==5.3
+PyYAML==5.4
 six==1.14.0
 thrift==0.13.0