diff --git a/Gemfile.lock b/Gemfile.lock
index de0b44b30..d18bb7ea6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -58,7 +58,7 @@ GEM
       public_suffix (>= 2.0.2, < 4.0)
     arel (6.0.4)
     ast (2.3.0)
-    autoprefixer-rails (7.2.2)
+    autoprefixer-rails (7.2.3)
       execjs
     bcrypt (3.1.11)
     better_errors (2.2.0)
@@ -353,8 +353,8 @@ GEM
     omniauth-oauth (1.1.0)
       oauth
       omniauth (~> 1.0)
-    omniauth-oauth2 (1.4.0)
-      oauth2 (~> 1.0)
+    omniauth-oauth2 (1.5.0)
+      oauth2 (~> 1.1)
       omniauth (~> 1.2)
     omniauth-twitter (1.4.0)
       omniauth-oauth (~> 1.1)
@@ -376,7 +376,7 @@ GEM
       moneta (~> 0.8.1)
     plupload-rails (1.2.1)
       rails (>= 3.1)
-    poltergeist (1.16.0)
+    poltergeist (1.17.0)
       capybara (~> 2.1)
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)