diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 207f5703fc..f0a84c8a49 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,67 +19,20 @@ jobs:
           - '3.2'
           - '3.1'
           - '3.0'
-          - '2.7'
-          - '2.6'
-          - '2.5'
-          - '2.4'
-          - '2.3'
-          - '2.2'
-          - '2.1'
         env:
           - DEVISE_ORM=active_record
           - DEVISE_ORM=mongoid
         exclude:
-          - gemfile: Gemfile
-            ruby: '2.6'
-          - gemfile: Gemfile
-            ruby: '2.5'
-          - gemfile: Gemfile
-            ruby: '2.4'
-          - gemfile: Gemfile
-            ruby: '2.3'
-          - gemfile: Gemfile
-            ruby: '2.2'
-          - gemfile: Gemfile
-            ruby: '2.1'
           - gemfile: Gemfile
             env: DEVISE_ORM=mongoid
-          - gemfile: gemfiles/Gemfile-rails-main
-            ruby: '2.6'
-          - gemfile: gemfiles/Gemfile-rails-main
-            ruby: '2.5'
-          - gemfile: gemfiles/Gemfile-rails-main
-            ruby: '2.4'
-          - gemfile: gemfiles/Gemfile-rails-main
-            ruby: '2.3'
-          - gemfile: gemfiles/Gemfile-rails-main
-            ruby: '2.2'
-          - gemfile: gemfiles/Gemfile-rails-main
-            ruby: '2.1'
           - gemfile: gemfiles/Gemfile-rails-main
             env: DEVISE_ORM=mongoid
-          - gemfile: gemfiles/Gemfile-rails-6-1
-            ruby: '2.4'
-          - gemfile: gemfiles/Gemfile-rails-6-1
-            ruby: '2.3'
-          - gemfile: gemfiles/Gemfile-rails-6-1
-            ruby: '2.2'
-          - gemfile: gemfiles/Gemfile-rails-6-1
-            ruby: '2.1'
           - gemfile: gemfiles/Gemfile-rails-6-1
             env: DEVISE_ORM=mongoid
           - gemfile: gemfiles/Gemfile-rails-6-0
             ruby: '3.2'
           - gemfile: gemfiles/Gemfile-rails-6-0
             ruby: '3.1'
-          - gemfile: gemfiles/Gemfile-rails-6-0
-            ruby: '2.4'
-          - gemfile: gemfiles/Gemfile-rails-6-0
-            ruby: '2.3'
-          - gemfile: gemfiles/Gemfile-rails-6-0
-            ruby: '2.2'
-          - gemfile: gemfiles/Gemfile-rails-6-0
-            ruby: '2.1'
           - gemfile: gemfiles/Gemfile-rails-6-0
             env: DEVISE_ORM=mongoid
           - gemfile: gemfiles/Gemfile-rails-5-2
@@ -88,12 +41,6 @@ jobs:
             ruby: '3.1'
           - gemfile: gemfiles/Gemfile-rails-5-2
             ruby: '3.0'
-          - gemfile: gemfiles/Gemfile-rails-5-2
-            ruby: '2.7'
-          - gemfile: gemfiles/Gemfile-rails-5-2
-            ruby: '2.2'
-          - gemfile: gemfiles/Gemfile-rails-5-2
-            ruby: '2.1'
           - gemfile: gemfiles/Gemfile-rails-5-2
             env: DEVISE_ORM=mongoid
           - gemfile: gemfiles/Gemfile-rails-5-1
@@ -102,10 +49,6 @@ jobs:
             ruby: '3.1'
           - gemfile: gemfiles/Gemfile-rails-5-1
             ruby: '3.0'
-          - gemfile: gemfiles/Gemfile-rails-5-1
-            ruby: '2.7'
-          - gemfile: gemfiles/Gemfile-rails-5-1
-            ruby: '2.1'
           - gemfile: gemfiles/Gemfile-rails-5-1
             env: DEVISE_ORM=mongoid
           - gemfile: gemfiles/Gemfile-rails-5-0
@@ -114,10 +57,6 @@ jobs:
             ruby: '3.1'
           - gemfile: gemfiles/Gemfile-rails-5-0
             ruby: '3.0'
-          - gemfile: gemfiles/Gemfile-rails-5-0
-            ruby: '2.7'
-          - gemfile: gemfiles/Gemfile-rails-5-0
-            ruby: '2.1'
           - gemfile: gemfiles/Gemfile-rails-5-0
             env: DEVISE_ORM=mongoid
           - gemfile: gemfiles/Gemfile-rails-4-2
@@ -126,24 +65,12 @@ jobs:
             ruby: '3.1'
           - gemfile: gemfiles/Gemfile-rails-4-2
             ruby: '3.0'
-          - gemfile: gemfiles/Gemfile-rails-4-2
-            ruby: '2.7'
-          - gemfile: gemfiles/Gemfile-rails-4-2
-            ruby: '2.6'
           - gemfile: gemfiles/Gemfile-rails-4-1
             ruby: '3.2'
           - gemfile: gemfiles/Gemfile-rails-4-1
             ruby: '3.1'
           - gemfile: gemfiles/Gemfile-rails-4-1
             ruby: '3.0'
-          - gemfile: gemfiles/Gemfile-rails-4-1
-            ruby: '2.7'
-          - gemfile: gemfiles/Gemfile-rails-4-1
-            ruby: '2.6'
-          - gemfile: gemfiles/Gemfile-rails-4-1
-            ruby: '2.5'
-          - gemfile: gemfiles/Gemfile-rails-4-1
-            ruby: '2.4'
     runs-on: ubuntu-latest
     env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
@@ -152,12 +79,6 @@ jobs:
       - name: Setup Bundler 1.x for Rails 4.x
         if: ${{ matrix.gemfile == 'gemfiles/Gemfile-rails-4-1' || matrix.gemfile == 'gemfiles/Gemfile-rails-4-2' }}
         run: echo "BUNDLER_VERSION=1.17.3" >> $GITHUB_ENV
-      - name: Setup Rubygems version as default for Ruby < 2.5
-        if: ${{ matrix.ruby < '2.5' }}
-        run: echo "RUBYGEMS_VERSION=default" >> $GITHUB_ENV
-      - name: Setup Rubygems version as 3.2.3 for Ruby 2.5
-        if: ${{ matrix.ruby == '2.5' }}
-        run: echo "RUBYGEMS_VERSION=3.2.3" >> $GITHUB_ENV
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
diff --git a/README.md b/README.md
index 0f2a7d64fe..7ef60c130c 100644
--- a/README.md
+++ b/README.md
@@ -129,9 +129,9 @@ Please note that the command output will show the variable value being used.
 ### BUNDLE_GEMFILE
 We can use this variable to tell bundler what Gemfile it should use (instead of the one in the current directory).
 Inside the [gemfiles](https://github.com/heartcombo/devise/tree/main/gemfiles) directory, we have one for each version of Rails we support. When you send us a pull request, it may happen that the test suite breaks using some of them. If that's the case, you can simulate the same environment using the `BUNDLE_GEMFILE` variable.
-For example, if the tests broke using Ruby 2.4.2 and Rails 4.1, you can do the following:
+For example, if the tests broke using Ruby 3.0.0 and Rails 4.1, you can do the following:
 ```bash
-rbenv shell 2.4.2 # or rvm use 2.4.2
+rbenv shell 3.0.0 # or rvm use 3.0.0
 BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bundle install
 BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bin/test
 ```
diff --git a/devise.gemspec b/devise.gemspec
index 3efad0f4d6..bea117bb78 100644
--- a/devise.gemspec
+++ b/devise.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
 
   s.files         = Dir["{app,config,lib}/**/*", "CHANGELOG.md", "MIT-LICENSE", "README.md"]
   s.require_paths = ["lib"]
-  s.required_ruby_version = '>= 2.1.0'
+  s.required_ruby_version = '>= 3.0.0'
 
   s.add_dependency("warden", "~> 1.2.3")
   s.add_dependency("orm_adapter", "~> 0.1")
diff --git a/gemfiles/Gemfile-rails-4-1 b/gemfiles/Gemfile-rails-4-1
index 6f0b77e83d..7bbabf9db0 100644
--- a/gemfiles/Gemfile-rails-4-1
+++ b/gemfiles/Gemfile-rails-4-1
@@ -38,9 +38,3 @@ end
 group :mongoid do
   gem "mongoid", "~> 4.0"
 end
-
-if RUBY_VERSION < "2.3.0"
-  # We're getting version 2.2.0 which doesn't play nice with Ruby 2.2, using
-  # `Object.deprecate_constant` which isn't available.
-  gem "multipart-post", "2.1.1"
-end
diff --git a/gemfiles/Gemfile-rails-4-2 b/gemfiles/Gemfile-rails-4-2
index 43367157fd..6e106b5e92 100644
--- a/gemfiles/Gemfile-rails-4-2
+++ b/gemfiles/Gemfile-rails-4-2
@@ -37,9 +37,3 @@ end
 group :mongoid do
   gem "mongoid", "~> 4.0"
 end
-
-if RUBY_VERSION < "2.3.0"
-  # We're getting version 2.2.0 which doesn't play nice with Ruby 2.2, using
-  # `Object.deprecate_constant` which isn't available.
-  gem "multipart-post", "2.1.1"
-end
diff --git a/gemfiles/Gemfile-rails-5-0 b/gemfiles/Gemfile-rails-5-0
index 382cf3c5d3..2f60c3a2b3 100644
--- a/gemfiles/Gemfile-rails-5-0
+++ b/gemfiles/Gemfile-rails-5-0
@@ -29,9 +29,3 @@ end
 # group :mongoid do
 #   gem "mongoid", "~> 4.0.0"
 # end
-
-if RUBY_VERSION < "2.3.0"
-  # We're getting version 2.2.0 which doesn't play nice with Ruby 2.2, using
-  # `Object.deprecate_constant` which isn't available.
-  gem "multipart-post", "2.1.1"
-end
diff --git a/gemfiles/Gemfile-rails-5-1 b/gemfiles/Gemfile-rails-5-1
index 24fe1d5e98..c566e9c84f 100644
--- a/gemfiles/Gemfile-rails-5-1
+++ b/gemfiles/Gemfile-rails-5-1
@@ -22,9 +22,3 @@ end
 platforms :ruby do
   gem "sqlite3", "~> 1.3.6"
 end
-
-if RUBY_VERSION < "2.3.0"
-  # We're getting version 2.2.0 which doesn't play nice with Ruby 2.2, using
-  # `Object.deprecate_constant` which isn't available.
-  gem "multipart-post", "2.1.1"
-end