diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 5742def..e390f3f 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,7 +1,7 @@
 ## These are the standard rules for all EasyPost public repositories.
 ##
 
-* @EasyPost/team-shippers @EasyPost/easypost-public-maintainers
+* @EasyPost/dev-tools @EasyPost/easypost-public-maintainers
 
 # The devtools team owns the codeowners file, this is for auditing purposes
 .github/CODEOWNERS @easypost/dev-tools
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 38e4115..9038cd4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rubyversion: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
+        rubyversion: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4', '4.0']
     steps:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
diff --git a/easypost.gemspec b/easypost.gemspec
index 76a1d8a..98fa82b 100644
--- a/easypost.gemspec
+++ b/easypost.gemspec
@@ -20,6 +20,8 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.required_ruby_version = '>= 2.7'
 
+  spec.add_dependency 'base64'
+
   spec.add_development_dependency 'abbrev', '~> 0.1'
   spec.add_development_dependency 'benchmark', '~> 0.4'
   spec.add_development_dependency 'bigdecimal', '~> 3'
@@ -34,6 +36,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'simplecov', '~> 0.22'
   spec.add_development_dependency 'simplecov-lcov', '~> 0.8'
   spec.add_development_dependency 'typhoeus', '~> 1.4'
-  spec.add_development_dependency 'vcr', '~> 6.3'
+  spec.add_development_dependency 'vcr', '~> 6.4'
   spec.add_development_dependency 'webmock', '~> 3.25'
 end