diff --git a/Gemfile b/Gemfile
index 2954f2807..a22ca8886 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,8 +67,8 @@ gem "modernizr-rails"
 gem "net-ssh", "~> 7.1.0"
 gem "normalize-rails"
 gem "oai"
-gem "omniauth", "1.9.2"
-gem "omniauth-cas", "2.0.0"
+gem "omniauth", "2.1.2"
+gem "omniauth-cas", "3.0.0"
 gem "openseadragon"
 gem "pg"
 gem "prawn"
diff --git a/Gemfile.lock b/Gemfile.lock
index d75c976ce..feba1d0db 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -707,13 +707,14 @@ GEM
       faraday-follow_redirects (>= 0.3.0, < 2)
     oj (3.16.3)
       bigdecimal (>= 3.0)
-    omniauth (1.9.2)
+    omniauth (2.1.2)
       hashie (>= 3.4.6)
-      rack (>= 1.6.2, < 3)
-    omniauth-cas (2.0.0)
-      addressable (~> 2.3)
-      nokogiri (~> 1.5)
-      omniauth (~> 1.2)
+      rack (>= 2.2.3)
+      rack-protection
+    omniauth-cas (3.0.0)
+      addressable (~> 2.8)
+      nokogiri (~> 1.12)
+      omniauth (~> 2.1)
     open4 (1.3.4)
     openseadragon (0.6.0)
       rails (> 3.2.0)
@@ -1258,8 +1259,8 @@ DEPENDENCIES
   net-ssh (~> 7.1.0)
   normalize-rails
   oai
-  omniauth (= 1.9.2)
-  omniauth-cas (= 2.0.0)
+  omniauth (= 2.1.2)
+  omniauth-cas (= 3.0.0)
   openseadragon
   parallel_tests
   pdf-reader!