diff --git a/spec/dummy/Gemfile.lock b/spec/dummy/Gemfile.lock
index a9691b7..9ed9a15 100644
--- a/spec/dummy/Gemfile.lock
+++ b/spec/dummy/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
     treetop (1.4.12)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.37)
+    tzinfo (0.3.61)
 
 PLATFORMS
   ruby