diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7b79c33..38e596b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -33,6 +33,7 @@ jobs:
           "3.1",
           "3.2",
           "3.3",
+          "3.4",
         ]
 
     name: Ruby ${{ matrix.ruby-version }} on OS ${{ matrix.os }}
@@ -45,7 +46,6 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
-          architecture: x64
 
       - name: Caching of CrateDB
         uses: actions/cache@v5
@@ -59,11 +59,10 @@ jobs:
         id: cache-gems
         with:
           path: vendor/bundle
-          key: gems-os=${{ matrix.os }}-ruby=${{ matrix.ruby-version }}-${{ hashFiles('**/Gemfile.lock') }}
+          key: gems-os=${{ matrix.os }}-ruby=${{ matrix.ruby-version }}-${{ hashFiles('**/*.gemspec') }}
 
       - name: Bundle install
         run: |
-          gem install bundler --version '< 2.4'
           bundle config path vendor/bundle
           bundle install
 
diff --git a/.gitignore b/.gitignore
index c89f452..dbae69c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.gem
+*.lock
 *.rbc
 .bundle
 .config
diff --git a/DEVELOP.rst b/DEVELOP.rst
index 23e82eb..80d06cb 100644
--- a/DEVELOP.rst
+++ b/DEVELOP.rst
@@ -28,14 +28,6 @@ Update linter violations file::
 
     $ bundle exec rubocop --auto-gen-config
 
-Dependencies
-============
-
-Update lock file ``Gemfile.lock``::
-
-    $ bundle update
-
-
 Preparing a Release
 ===================
 
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 4f7a8a6..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,71 +0,0 @@
-PATH
-  remote: .
-  specs:
-    crate_ruby (0.2.1)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    ast (2.4.3)
-    base64 (0.3.0)
-    diff-lcs (1.6.2)
-    json (2.18.1)
-    os (1.1.4)
-    parallel (1.27.0)
-    parser (3.3.10.1)
-      ast (~> 2.4.1)
-      racc
-    prism (1.9.0)
-    racc (1.8.1)
-    rainbow (3.1.1)
-    regexp_parser (2.11.3)
-    rexml (3.4.4)
-    rspec (3.13.2)
-      rspec-core (~> 3.13.0)
-      rspec-expectations (~> 3.13.0)
-      rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.6)
-      rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.5)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.7)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.13.0)
-    rspec-support (3.13.7)
-    rubocop (1.39.0)
-      json (~> 2.3)
-      parallel (~> 1.10)
-      parser (>= 3.1.2.1)
-      rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8, < 3.0)
-      rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.23.0, < 2.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.49.0)
-      parser (>= 3.3.7.2)
-      prism (~> 1.7)
-    rubocop-rspec (2.17.1)
-      rubocop (~> 1.33)
-    ruby-progressbar (1.13.0)
-    unicode-display_width (2.6.0)
-
-PLATFORMS
-  x86_64-darwin-17
-  x86_64-darwin-19
-  x86_64-darwin-20
-  x86_64-darwin-23
-  x86_64-linux
-
-DEPENDENCIES
-  base64
-  bundler
-  crate_ruby!
-  os
-  rspec (~> 3.10)
-  rubocop (< 1.40)
-  rubocop-rspec
-
-BUNDLED WITH
-   2.2.16
diff --git a/crate_ruby.gemspec b/crate_ruby.gemspec
index 4c1add3..7fbdcb5 100644
--- a/crate_ruby.gemspec
+++ b/crate_ruby.gemspec
@@ -55,10 +55,14 @@ Gem::Specification.new do |spec|
     'rubygems_mfa_required' => 'true'
   }
 
-  spec.add_development_dependency 'base64'
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'os'
   spec.add_development_dependency 'rspec', '~> 3.10'
   spec.add_development_dependency 'rubocop', '< 1.40'
   spec.add_development_dependency 'rubocop-rspec'
+
+  # Needed by rubocop.
+  spec.add_development_dependency 'base64'
+  spec.add_development_dependency 'benchmark'
+  spec.add_development_dependency 'ostruct'
 end