diff --git a/Gemfile.lock b/Gemfile.lock
index 9fc58f9..a7eb3ab 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -196,8 +196,8 @@ GEM
     parser (2.5.0.2)
       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)
@@ -208,8 +208,8 @@ GEM
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
     puma (3.11.4)
-    rack (2.0.4)
-    rack-test (0.8.2)
+    rack (2.0.5)
+    rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.1.5)
       actioncable (= 5.1.5)
@@ -326,7 +326,7 @@ GEM
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
-    xpath (3.0.0)
+    xpath (3.1.0)
       nokogiri (~> 1.8)
 
 PLATFORMS