diff --git a/Gemfile.lock b/Gemfile.lock
index 5caf9d6..add3568 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -164,7 +164,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     psych (3.1.0)
-    puma (4.3.1)
+    puma (4.3.5)
       nio4r (~> 2.0)
     r18n-core (3.2.0)
     rack (2.0.8)