diff --git a/appengine/flexible/static_files/Gemfile.lock b/appengine/flexible/static_files/Gemfile.lock
index f755a54b6..ca12063a9 100644
--- a/appengine/flexible/static_files/Gemfile.lock
+++ b/appengine/flexible/static_files/Gemfile.lock
@@ -3,6 +3,7 @@ GEM
   specs:
     addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.3.0)
     capybara (3.39.2)
       addressable
       matrix
@@ -13,15 +14,16 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     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 (1.5.0)
-    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)
     matrix (0.4.2)
     mini_mime (1.1.5)
     mini_portile2 (2.8.6)
@@ -68,7 +70,8 @@ GEM
     temple (0.10.2)
     tilt (2.2.0)
     webrick (1.8.1)
-    websocket-driver (0.7.6)
+    websocket-driver (0.8.1)
+      base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     xpath (3.2.0)