diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index ab63ece..b25dbb3 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -14,28 +14,29 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, ubuntu-20.04, macos-latest, macos-13, macos-12, windows-latest, windows-2019]
         ruby: ['3.0.7', '3.1', '3.2', '3.3']
 
     steps:
       - uses: actions/checkout@v3
+
       - name: Set timezone on Linux
-        if: matrix.os == 'ubuntu-latest'
+        if: contains(matrix.os, 'ubuntu')
         run: sudo timedatectl set-timezone 'America/New_York'
 
       - name: Set timezone on macOS
-        if: matrix.os == 'macos-latest'
+        if: contains(matrix.os, 'macos')
         run: sudo systemsetup -settimezone America/New_York
 
       - name: Set timezone on Windows
-        if: matrix.os == 'windows-latest'
+        if: contains(matrix.os, 'windows')
         run: tzutil /s "Eastern Standard Time"
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          bundler-cache: true
 
       - name: Update RubyGems
         run: gem update --system
diff --git a/Gemfile b/Gemfile
index c606c9d..d80b00c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,7 +22,7 @@ group :test do
 end
 
 group :development, :test do
-  gem 'dotenv', '>= 2.8', '< 3.0'
+  gem 'dotenv', '>= 2.8', '< 4.0'
   gem 'factory_bot', '~> 6.3'
   gem 'ffaker', '~> 2.21'
   gem 'pry-byebug', '>= 3.9', '< 4.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 98ea807..9646aef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,7 @@ GEM
     connection_pool (2.4.1)
     diff-lcs (1.5.1)
     docile (1.4.0)
-    dotenv (2.8.1)
+    dotenv (3.1.2)
     drb (2.2.1)
     dry-configurable (1.1.0)
       dry-core (~> 1.0, < 2)
@@ -160,12 +160,13 @@ PLATFORMS
   x64-mingw-ucrt
   x64-mingw32
   x86_64-darwin-19
+  x86_64-darwin-20
   x86_64-darwin-21
   x86_64-linux
 
 DEPENDENCIES
   bundler (>= 2.5, < 3.0)
-  dotenv (>= 2.8, < 3.0)
+  dotenv (>= 2.8, < 4.0)
   dsu!
   factory_bot (~> 6.3)
   ffaker (~> 2.21)