diff --git a/shared/gemfiles/20150517/Gemfile.lock b/shared/gemfiles/20150517/Gemfile.lock
index 896804c..26a246c 100644
--- a/shared/gemfiles/20150517/Gemfile.lock
+++ b/shared/gemfiles/20150517/Gemfile.lock
@@ -8,11 +8,12 @@ GEM
     kgio (2.9.3)
     mysql2 (0.3.18)
     mysql2 (0.3.18-x86-mingw32)
+    nio4r (2.5.8)
     pg (0.18.2)
     pg (0.18.2-x86-mingw32)
-    puma (2.11.2)
-      rack (>= 1.1, < 2.0)
-    rack (1.6.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
+    rack (3.0.4.1)
     raindrops (0.13.0)
     redcarpet (3.2.3)
     snappy (0.0.11)