diff --git a/Gemfile b/Gemfile
index 33a86a0b..ece28562 100644
--- a/Gemfile
+++ b/Gemfile
@@ -30,37 +30,37 @@ gem 'globalize', '~> 6.2', '>= 6.2.1'
 
 # For reading and parsing HTML from Neopets.com, like importing Closet pages.
 gem 'nokogiri', '~> 1.13', '>= 1.13.10'
-gem "rest-client", "~> 1.6.7"
+gem 'rest-client', '~> 2.1'
 
 # For safely rendering users' Markdown + HTML on item list pages.
-gem 'rdiscount', '~> 1.6.5'
-gem 'sanitize', '~> 2.0.3'
+gem 'rdiscount', '~> 2.2', '>= 2.2.7.1'
+gem 'sanitize', '~> 6.0', '>= 6.0.2'
 
 # For working with Neopets APIs.
 # unstable version of RocketAMF interprets info registry as a hash instead of an array
 gem 'RocketAMF', :git => 'https://github.com/rubyamf/rocketamf.git'
 
 # For working with the OpenNeo ID service.
-gem 'msgpack', '~> 1.6', '>= 1.6.1'
+gem 'msgpack', '~> 1.7', '>= 1.7.2'
 gem 'openneo-auth-signatory', '~> 0.1.0'
 
 # For preventing too many modeling attempts.
-gem 'rack-attack', '~> 2.2.0'
+gem 'rack-attack', '~> 6.7'
 
 # For testing emails in development.
-gem "letter_opener", :group => :development
+gem 'letter_opener', '~> 1.8', '>= 1.8.1', group: :development
 
 # For parallel API calls.
-gem "parallel", "~> 1.13.0"
+gem 'parallel', '~> 1.23'
 
 # For debugging.
-gem 'web-console', '~> 3.7'
+gem 'web-console', '~> 3.7', group: :development
 
 # TODO: Review our use of content_tag_for etc and uninstall this!
-gem 'record_tag_helper', '~> 1.0'
+gem 'record_tag_helper', '~> 1.0', '>= 1.0.1'
 
 # Reduces boot times through caching; required in config/boot.rb
-gem 'bootsnap', require: false
+gem 'bootsnap', '~> 1.16', require: false
 
 # For deployment.
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index f93943a8..e10c7475 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.3.8)
+    addressable (2.8.4)
+      public_suffix (>= 2.0.2, < 6.0)
     arel (9.0.0)
     babel-source (5.8.35)
     babel-transpiler (0.7.0)
@@ -56,7 +57,7 @@ GEM
       execjs (~> 2.0)
     bcrypt (3.1.19)
     bindex (0.8.1)
-    bootsnap (1.12.0)
+    bootsnap (1.16.0)
       msgpack (~> 1.2)
     builder (3.2.4)
     capistrano (2.15.5)
@@ -93,6 +94,8 @@ GEM
       responders
       warden (~> 1.2.3)
     diff-lcs (1.2.5)
+    domain_name (0.5.20190701)
+      unf (>= 0.0.5, < 1.0.0)
     dotenv (2.8.1)
     dotenv-rails (2.8.1)
       dotenv (= 2.8.1)
@@ -116,13 +119,16 @@ GEM
       thor
       tilt
     highline (1.7.2)
+    http-accept (1.7.0)
+    http-cookie (1.0.5)
+      domain_name (~> 0.5)
     http_accept_language (2.1.1)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    launchy (2.4.3)
-      addressable (~> 2.3)
-    letter_opener (1.4.1)
-      launchy (~> 2.2)
+    launchy (2.5.2)
+      addressable (~> 2.8)
+    letter_opener (1.8.1)
+      launchy (>= 2.2, < 3)
     loofah (2.21.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -134,11 +140,13 @@ GEM
     marcel (1.0.2)
     memcache-client (1.8.5)
     method_source (1.0.0)
-    mime-types (1.25.1)
+    mime-types (3.4.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2023.0218.1)
     mini_mime (1.1.2)
     mini_portile2 (2.8.4)
     minitest (5.19.0)
-    msgpack (1.6.1)
+    msgpack (1.7.2)
     multi_json (1.15.0)
     mysql2 (0.5.5)
     net-imap (0.3.7)
@@ -157,6 +165,7 @@ GEM
     net-ssh (2.9.2)
     net-ssh-gateway (1.2.0)
       net-ssh (>= 2.6.5)
+    netrc (0.11.0)
     nio4r (2.5.9)
     nokogiri (1.13.10)
       mini_portile2 (~> 2.8.0)
@@ -164,11 +173,12 @@ GEM
     openneo-auth-signatory (0.1.0)
       ruby-hmac
     orm_adapter (0.5.0)
-    parallel (1.13.0)
+    parallel (1.23.0)
+    public_suffix (5.0.3)
     racc (1.7.1)
     rack (2.2.8)
-    rack-attack (2.2.1)
-      rack
+    rack-attack (6.7.0)
+      rack (>= 1.0, < 4)
     rack-test (2.1.0)
       rack (>= 1.3)
     rails (5.2.8.1)
@@ -203,7 +213,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rdiscount (1.6.8)
+    rdiscount (2.2.7.1)
     react-rails (2.7.1)
       babel-transpiler (>= 0.7.0)
       connection_pool
@@ -217,8 +227,11 @@ GEM
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
       railties (>= 4.2.0, < 6.0)
-    rest-client (1.6.9)
-      mime-types (~> 1.16)
+    rest-client (2.1.0)
+      http-accept (>= 1.7.0, < 2.0)
+      http-cookie (>= 1.0.2, < 2.0)
+      mime-types (>= 1.16, < 4.0)
+      netrc (~> 0.8)
     rspec (2.0.1)
       rspec-core (~> 2.0.1)
       rspec-expectations (~> 2.0.1)
@@ -234,8 +247,9 @@ GEM
     ruby-hmac (0.4.0)
     rvm-capistrano (1.5.6)
       capistrano (~> 2.15.4)
-    sanitize (2.0.6)
-      nokogiri (>= 1.4.4)
+    sanitize (6.0.2)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
     sass (3.4.25)
     sass-rails (5.0.7)
       railties (>= 4.0.0, < 6)
@@ -259,6 +273,9 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.8.2)
     warden (1.2.7)
       rack (>= 1.0)
     web-console (3.7.0)
@@ -276,7 +293,7 @@ PLATFORMS
 
 DEPENDENCIES
   RocketAMF!
-  bootsnap
+  bootsnap (~> 1.16)
   capistrano (~> 2.15.5)
   compass-rails (~> 3.1)
   devise (~> 4.9, >= 4.9.2)
@@ -285,23 +302,23 @@ DEPENDENCIES
   globalize (~> 6.2, >= 6.2.1)
   haml (~> 6.1, >= 6.1.1)
   http_accept_language (~> 2.1, >= 2.1.1)
-  letter_opener
+  letter_opener (~> 1.8, >= 1.8.1)
   memcache-client (~> 1.8.5)
-  msgpack (~> 1.6, >= 1.6.1)
+  msgpack (~> 1.7, >= 1.7.2)
   mysql2 (~> 0.5.5)
   nokogiri (~> 1.13, >= 1.13.10)
   openneo-auth-signatory (~> 0.1.0)
-  parallel (~> 1.13.0)
-  rack-attack (~> 2.2.0)
+  parallel (~> 1.23)
+  rack-attack (~> 6.7)
   rails (= 5.2.8.1)
   rails-i18n (~> 5.1, >= 5.1.3)
-  rdiscount (~> 1.6.5)
+  rdiscount (~> 2.2, >= 2.2.7.1)
   react-rails (~> 2.7, >= 2.7.1)
-  record_tag_helper (~> 1.0)
-  rest-client (~> 1.6.7)
+  record_tag_helper (~> 1.0, >= 1.0.1)
+  rest-client (~> 2.1)
   rspec-rails (~> 2.0.0.beta.22)
   rvm-capistrano (~> 1.5.6)
-  sanitize (~> 2.0.3)
+  sanitize (~> 6.0, >= 6.0.2)
   sass-rails (~> 5.0, >= 5.0.7)
   uglifier (~> 4.2)
   web-console (~> 3.7)
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