diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7366f03..e73fa8f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -24,7 +24,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu-22.04", "macos-15-intel" ] # , windows-latest ]
-        ruby-version: [ "2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2" ]
+        ruby-version: [
+          "2.6",
+          "2.7",
+          "3.0",
+          "3.1",
+          "3.2",
+          "3.3",
+        ]
 
     name: Ruby ${{ matrix.ruby-version }} on OS ${{ matrix.os }}
     steps:
diff --git a/.gitignore b/.gitignore
index 34c3268..c89f452 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,5 +21,6 @@ log/crate.log
 crate_test_server.*
 crate-*.tar.gz
 parts/
+vendor/
 
 .byebug_history
diff --git a/.rubocop.yml b/.rubocop.yml
index 3240022..2fc2808 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,4 +4,4 @@ require: rubocop-rspec
 
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
diff --git a/DEVELOP.rst b/DEVELOP.rst
index 138e5dc..23e82eb 100644
--- a/DEVELOP.rst
+++ b/DEVELOP.rst
@@ -17,6 +17,9 @@ Then, run tests::
 
     $ bundle exec rspec
 
+Linter
+======
+
 Run linter::
 
     $ bundle exec rubocop
@@ -25,6 +28,13 @@ 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
index 7bbc7df..4f7a8a6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,62 +6,65 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.4.2)
-    diff-lcs (1.5.1)
+    ast (2.4.3)
+    base64 (0.3.0)
+    diff-lcs (1.6.2)
+    json (2.18.1)
     os (1.1.4)
-    parallel (1.22.1)
-    parser (3.1.3.0)
+    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)
-    rake (13.2.1)
-    regexp_parser (2.6.1)
-    rexml (3.2.5)
-    rspec (3.13.0)
+    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 (3.13.2)
+    rspec-core (3.13.6)
       rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.3)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.2)
+    rspec-mocks (3.13.7)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-support (3.13.2)
-    rubocop (1.12.1)
+    rspec-support (3.13.7)
+    rubocop (1.39.0)
+      json (~> 2.3)
       parallel (~> 1.10)
-      parser (>= 3.0.0.0)
+      parser (>= 3.1.2.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.2.0, < 2.0)
+      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 (1.23.0)
-      parser (>= 3.1.1.0)
-    rubocop-rake (0.5.1)
-      rubocop
-    rubocop-rspec (2.3.0)
-      rubocop (~> 1.0)
-      rubocop-ast (>= 1.1.0)
-    ruby-progressbar (1.11.0)
-    unicode-display_width (2.3.0)
+    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
-  rake
   rspec (~> 3.10)
-  rubocop (< 1.13)
-  rubocop-rake
+  rubocop (< 1.40)
   rubocop-rspec
 
 BUNDLED WITH
diff --git a/crate_ruby.gemspec b/crate_ruby.gemspec
index c872941..d8e44dc 100644
--- a/crate_ruby.gemspec
+++ b/crate_ruby.gemspec
@@ -33,11 +33,10 @@ Gem::Specification.new do |spec|
   spec.description   = 'A Ruby library for the CrateDB HTTP interface with query support, DDL command and schema introspection shortcuts, and support for BLOB tables.'
   spec.homepage      = 'https://crate.io'
   spec.license       = 'Apache-2.0'
-  spec.required_ruby_version = '>= 2.4'
+  spec.required_ruby_version = '>= 2.5'
 
   spec.files         = Dir['lib/**/*']
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
-  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = %w[lib]
   spec.extra_rdoc_files = Dir['README.rst', 'CHANGES.rst', 'LICENSE', 'NOTICE']
   spec.rdoc_options    += [
@@ -53,14 +52,14 @@ Gem::Specification.new do |spec|
     'changelog_uri' => 'https://github.com/crate/crate_ruby/blob/main/CHANGES.rst',
     'documentation_uri' => 'https://www.rubydoc.info/gems/crate_ruby',
     'homepage_uri' => spec.homepage,
-    'source_code_uri' => 'https://github.com/crate/crate_ruby'
+    'source_code_uri' => 'https://github.com/crate/crate_ruby',
+    'rubygems_mfa_required' => 'true'
   }
 
+  spec.add_development_dependency 'base64'
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'os'
-  spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec', '~> 3.10'
-  spec.add_development_dependency 'rubocop', '< 1.13'
-  spec.add_development_dependency 'rubocop-rake'
+  spec.add_development_dependency 'rubocop', '< 1.40'
   spec.add_development_dependency 'rubocop-rspec'
 end
diff --git a/spec/bootstrap.rb b/spec/bootstrap.rb
index e7eab94..ec00621 100755
--- a/spec/bootstrap.rb
+++ b/spec/bootstrap.rb
@@ -58,9 +58,7 @@ def download
     Net::HTTP.start(uri.host, uri.port, use_ssl: uri.scheme == 'https') do |http|
       request = Net::HTTP::Get.new uri
       resp = http.request request
-      File.open(@fname, 'wb') do |file|
-        file.write(resp.body)
-      end
+      File.binwrite(@fname, resp.body)
     end
   end
 
diff --git a/spec/crate_ruby/client_spec.rb b/spec/crate_ruby/client_spec.rb
index 1ea93d1..a2ab065 100644
--- a/spec/crate_ruby/client_spec.rb
+++ b/spec/crate_ruby/client_spec.rb
@@ -72,9 +72,7 @@
         it 'downloads a blob' do
           data = client.blob_get(blob_table, digest)
           expect(data).to be_truthy
-          File.open(store_location, 'wb') do |file|
-            file.write(data)
-          end
+          File.binwrite(store_location, data)
         end
       end
 
@@ -85,7 +83,8 @@
         end
 
         it 'deletes a blob' do
-          client.blob_delete(blob_table, digest)
+          response = client.blob_delete(blob_table, digest)
+          expect(response).to be_falsy
         end
       end
     end
@@ -95,7 +94,7 @@
 
       before do
         client.execute("create table #{table_name} " \
-           '(id integer primary key, name string, address object, tags array(string)) ')
+                       '(id integer primary key, name string, address object, tags array(string)) ')
       end
 
       after do