diff --git a/requirements.txt b/requirements.txt
index 2d0fd07..4cc568a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 docutils==0.19
 lockfile==0.12.2
 pymongo==4.2.0
-slack-bolt==1.14.3
+slack-bolt==1.15.5
 slack-sdk==3.18.3