diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8cda30b2..7cb6d299 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,11 +23,11 @@ jobs:
       - name: Run rubocop
         run: bundle exec rubocop --parallel --format progress
 
-  grape-17:
+  grape-18:
     runs-on: ubuntu-latest
     needs: ['rubocop']
     env:
-      GRAPE_VERSION: '1.7.1'
+      GRAPE_VERSION: '1.8.0'
     strategy:
       matrix:
         ruby-version: ['3.1', '3.2', 'head']
@@ -55,37 +55,37 @@ jobs:
         bundle update
         bundle exec rspec
 
-  grape-18:
+  grape-20:
     runs-on: ubuntu-latest
     needs: ['rubocop']
     env:
-      GRAPE_VERSION: '1.8.0'
+      GRAPE_VERSION: '2.0.0'
     strategy:
       matrix:
         ruby-version: ['3.1', '3.2', 'head']
     steps:
-    - name: Check out branch
-      uses: actions/checkout@v4
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby-version }}
-    - name: Run rspec wo model parser
-      run: |
-        bundle update
-        bundle exec rspec
-    - name: Run rspec w entity parser
-      env:
-        MODEL_PARSER: grape-swagger-entity
-      run: |
-        bundle update
-        bundle exec rspec
-    - name: Run rspec w representable parser
-      env:
-        MODEL_PARSER: grape-swagger-representable
-      run: |
-        bundle update
-        bundle exec rspec
+      - name: Check out branch
+        uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+      - name: Run rspec wo model parser
+        run: |
+          bundle update
+          bundle exec rspec
+      - name: Run rspec w entity parser
+        env:
+          MODEL_PARSER: grape-swagger-entity
+        run: |
+          bundle update
+          bundle exec rspec
+      - name: Run rspec w representable parser
+        env:
+          MODEL_PARSER: grape-swagger-representable
+        run: |
+          bundle update
+          bundle exec rspec
 
   grape-HEAD:
     runs-on: ubuntu-latest
diff --git a/Gemfile b/Gemfile
index 9ea8fb76..51abac3d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
-source 'http://rubygems.org'
+source 'https://rubygems.org'
 
 gemspec
 
-gem 'grape', case version = ENV.fetch('GRAPE_VERSION', '~> 1.7')
+gem 'grape', case version = ENV.fetch('GRAPE_VERSION', '~> 1.8')
              when 'HEAD'
                { git: 'https://github.com/ruby-grape/grape' }
              else
@@ -34,7 +34,6 @@ end
 
 group :test do
   gem 'coveralls_reborn', require: false
-
   gem 'ruby-grape-danger', '~> 0.2.0', require: false
   gem 'simplecov', require: false
 end
diff --git a/grape-swagger.gemspec b/grape-swagger.gemspec
index 84cd12af..82aa325e 100644
--- a/grape-swagger.gemspec
+++ b/grape-swagger.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.metadata['rubygems_mfa_required'] = 'true'
 
   s.required_ruby_version = '>= 2.7'
-  s.add_runtime_dependency 'grape', '~> 1.3'
+  s.add_runtime_dependency 'grape', ['>= 1.3.0', '< 3.0.0']
   s.add_runtime_dependency 'rack-test', '~> 2'
 
   s.files = Dir['lib/**/*', '*.md', 'LICENSE.txt', 'grape-swagger.gemspec']