diff --git a/Gemfile.lock b/Gemfile.lock
index 0466efd..e6dee81 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,11 +126,10 @@ GEM
     erubi (1.13.1)
     et-orbi (1.4.0)
       tzinfo
-    ferrum (0.17.2)
+    ferrum (0.18.0)
       addressable (~> 2.5)
       base64 (~> 0.2)
       concurrent-ruby (~> 1.1)
-      webrick (~> 1.7)
       websocket-driver (~> 0.7)
     fugit (1.12.1)
       et-orbi (~> 1.4)
@@ -413,7 +412,6 @@ GEM
       actionview (>= 8.0.0)
       bindex (>= 0.4.0)
       railties (>= 8.0.0)
-    webrick (1.9.2)
     websocket-driver (0.8.2)
       base64
       websocket-extensions (>= 0.1.0)