diff --git a/example_app/Gemfile.lock b/example_app/Gemfile.lock
index cb2cbe4..ffe1488 100644
--- a/example_app/Gemfile.lock
+++ b/example_app/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.12.2)
     msgpack (1.3.1)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
@@ -118,7 +118,7 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (4.3.3)
+    puma (4.3.9)
       nio4r (~> 2.0)
     quantile (0.2.1)
     rack (2.0.8)