diff --git a/Gemfile.lock b/Gemfile.lock
index 951ca515..0a8cf9da 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,6 +8,16 @@ GIT
       omniauth (~> 1.2)
       rails
 
+GIT
+  remote: https://github.com/TuftsUniversity/pdfjs_viewer-rails.git
+  revision: d624c83a6fa9e8338989b9ec813caab288d437af
+  tag: tdl-20200428
+  specs:
+    pdfjs_viewer-rails (0.3.1)
+      json (> 1.8.4)
+      rails (> 4.2.0)
+      sass-rails (~> 5.0)
+
 GIT
   remote: https://github.com/samvera/hyrax.git
   revision: e2e1487a320a765d2e57720bbcfd63eb47777156
@@ -579,7 +589,7 @@ GEM
     mime-types-data (3.2019.0331)
     mini_magick (4.9.3)
     mini_mime (1.0.1)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.5.0)
     minitest (5.11.3)
     multi_json (1.13.1)
     multi_xml (0.6.0)
@@ -598,8 +608,9 @@ GEM
     noid-rails (3.0.1)
       actionpack (>= 5.0.0, < 6)
       noid (~> 0.9)
-    nokogiri (1.10.3)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.11.1)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     nokogumbo (1.5.0)
       nokogiri
     oai (0.4.0)
@@ -645,6 +656,7 @@ GEM
       nokogiri (~> 1.6)
       rails (~> 5.0)
       rdf
+    racc (1.5.2)
     rack (2.0.7)
     rack-attack (6.0.0)
       rack (>= 1.0, < 3)
@@ -978,6 +990,7 @@ DEPENDENCIES
   omniauth
   omniauth-saml
   orcid!
+  pdfjs_viewer-rails!
   puma (~> 3.7)
   rack-attack
   rails (~> 5.1.6.1)