diff --git a/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock b/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock
index f4ae5a8e0..5c1d6d936 100644
--- a/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock
+++ b/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock
@@ -12,15 +12,16 @@ GEM
       rack-test (>= 0.6.3)
       xpath (~> 3.1)
     concurrent-ruby (1.2.2)
-    cuprite (0.14.3)
+    cuprite (0.17)
       capybara (~> 3.0)
-      ferrum (~> 0.13.0)
+      ferrum (~> 0.17.0)
     diff-lcs (1.3)
-    ferrum (0.13)
+    ferrum (0.17.2)
       addressable (~> 2.5)
+      base64 (~> 0.2)
       concurrent-ruby (~> 1.1)
       webrick (~> 1.7)
-      websocket-driver (>= 0.6, < 0.8)
+      websocket-driver (~> 0.7)
     logger (1.7.0)
     mini_mime (1.0.0)
     mini_portile2 (2.8.6)
@@ -73,7 +74,8 @@ GEM
     temple (0.8.0)
     tilt (2.0.11)
     webrick (1.8.2)
-    websocket-driver (0.7.6)
+    websocket-driver (0.8.2)
+      base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     xpath (3.1.0)