diff --git a/Gemfile b/Gemfile
index 6cbdc00..e17f84b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,7 +20,7 @@ gem 'sqlite3'
 gem "actionview", ">= 5.2.8.1"
 # Use Puma as the app server
 # gem 'puma', '~> 3.12'
-gem "puma", ">= 6.4.2"
+gem "puma", ">= 5.6.4"
 # Use SCSS for stylesheets
 gem 'sassc-rails', '~> 2.1.0'
 # Use Uglifier as compressor for JavaScript assets
@@ -34,7 +34,7 @@ gem "activerecord", ">= 5.2.4.5"
 
 gem "activesupport", "~> 5.2.8.1"
 gem "activestorage", "~> 5.2.8.1"
-gem "rack", ">= 2.2.6.4"
+gem "rack", ">= 2.2.3"
 
 gem "actionpack", ">= 5.2.8.1"
 
@@ -99,4 +99,6 @@ gem 'oai'
 # Google Material Icons
 gem 'material_icons'
 
-gem "nokogiri", ">= 1.16.5"
+gem "nokogiri", ">= 1.13.9"
+
+
diff --git a/Gemfile.lock b/Gemfile.lock
index 2d7da6b..41e4a23 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -166,14 +166,14 @@ GEM
       railties (>= 3.2)
     method_source (1.0.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.6)
+    mini_portile2 (2.8.1)
     mini_racer (0.4.0)
       libv8-node (~> 15.14.0.0)
     minitar (0.9)
     minitest (5.17.0)
-    nio4r (2.7.3)
-    nokogiri (1.16.5)
-      mini_portile2 (~> 2.8.2)
+    nio4r (2.5.8)
+    nokogiri (1.13.10)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     oai (1.2.1)
       builder (>= 3.1.0)
@@ -182,10 +182,10 @@ GEM
     orm_adapter (0.5.0)
     popper_js (1.16.0)
     public_suffix (4.0.7)
-    puma (6.4.2)
+    puma (5.6.4)
       nio4r (~> 2.0)
-    racc (1.8.0)
-    rack (2.2.9)
+    racc (1.6.2)
+    rack (2.2.6.2)
     rack-cas (0.16.1)
       addressable (~> 2.3)
       nokogiri (~> 1.5)
@@ -224,8 +224,7 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     retriable (3.1.2)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
+    rexml (3.2.5)
     rsolr (2.5.0)
       builder (>= 2.1.2)
       faraday (>= 0.9, < 3, != 2.0.0)
@@ -262,7 +261,6 @@ GEM
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     sqlite3 (1.4.4)
-    strscan (3.1.0)
     thor (1.2.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
@@ -318,10 +316,10 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   material_icons
   mini_racer (= 0.4.0)
-  nokogiri (>= 1.14.3)
+  nokogiri (>= 1.13.9)
   oai
   puma (>= 5.6.4)
-  rack (>= 2.2.6.4)
+  rack (>= 2.2.3)
   rails (~> 5.2.8.1)
   rsolr (>= 1.0)
   sassc-rails (~> 2.1.0)