diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78826d5d..bfc05774 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ### 0.14.4 (Next)
 
+* [#288](https://github.com/slack-ruby/slack-ruby-client/pull/288): Adjust ping worker logger level to debug when offline - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 0.14.3 (2019/7/23)
diff --git a/lib/slack/real_time/client.rb b/lib/slack/real_time/client.rb
index 1b1ea474..1a3356aa 100644
--- a/lib/slack/real_time/client.rb
+++ b/lib/slack/real_time/client.rb
@@ -127,7 +127,7 @@ def keep_alive?
       def run_ping!
         return if keep_alive?
 
-        logger.warn(to_s) { 'is offline' }
+        logger.debug(to_s) { 'is offline' }
 
         restart_async
       rescue StandardError => e