diff --git a/Gemfile.lock b/Gemfile.lock
index b97865e..d7364a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -197,8 +197,8 @@ GEM
     parser (2.5.1.0)
       ast (~> 2.4.0)
     pg (1.0.0)
-    poltergeist (1.17.0)
-      capybara (~> 2.1)
+    poltergeist (1.18.1)
+      capybara (>= 2.1, < 4)
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     powder (0.4.0)