diff --git a/.github/workflows/sentry_resque_test.yml b/.github/workflows/sentry_resque_test.yml
index fb5c9f12e..5ea3436be 100644
--- a/.github/workflows/sentry_resque_test.yml
+++ b/.github/workflows/sentry_resque_test.yml
@@ -57,6 +57,14 @@ jobs:
           bundle install --jobs 4 --retry 3
           bundle exec rake
 
+      - name: Run specs with Rails
+        env:
+          BUNDLE_GEMFILE: Gemfile_with_rails.rb
+          RUBYOPT: ${{ matrix.options.rubyopt }}
+        run: |
+          bundle install --jobs 4 --retry 3
+          bundle exec rake
+
       - name: Upload Coverage
         if: ${{ matrix.options.codecov }}
         uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5c16c37b..22ea6a035 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Bug Fixes
 
+- Fix undefined method 'constantize' issue in `sentry-resque` ([#2248](https://github.com/getsentry/sentry-ruby/pull/2248))
 - Only instantiate SessionFlusher when the SDK is enabled under the current env [#2245](https://github.com/getsentry/sentry-ruby/pull/2245)
   - Fixes [#2234](https://github.com/getsentry/sentry-ruby/issues/2234)
 
diff --git a/sentry-resque/.gitignore b/sentry-resque/.gitignore
index b04a8c840..63f237641 100644
--- a/sentry-resque/.gitignore
+++ b/sentry-resque/.gitignore
@@ -3,6 +3,7 @@
 /_yardoc/
 /coverage/
 /doc/
+Gemfile_with_rails.rb.lock
 /pkg/
 /spec/reports/
 /tmp/
diff --git a/sentry-resque/Gemfile b/sentry-resque/Gemfile
index c5c9a4e88..58c13cada 100644
--- a/sentry-resque/Gemfile
+++ b/sentry-resque/Gemfile
@@ -4,12 +4,6 @@ git_source(:github) { |name| "https://github.com/#{name}.git" }
 # Specify your gem's dependencies in sentry-ruby.gemspec
 gemspec
 gem "sentry-ruby", path: "../sentry-ruby"
-gem "sentry-rails", path: "../sentry-rails"
-
-gem "rails"
-
-# For https://github.com/ruby/psych/issues/655
-gem "psych", "5.1.0"
 
 gem "resque-retry", "~> 1.8"
 
diff --git a/sentry-resque/Gemfile_with_rails.rb b/sentry-resque/Gemfile_with_rails.rb
new file mode 100644
index 000000000..bceb75350
--- /dev/null
+++ b/sentry-resque/Gemfile_with_rails.rb
@@ -0,0 +1,4 @@
+eval_gemfile File.expand_path("Gemfile", __dir__)
+
+gem "sentry-rails", path: "../sentry-rails"
+gem "rails"
diff --git a/sentry-resque/lib/sentry/resque.rb b/sentry-resque/lib/sentry/resque.rb
index 767772d76..f204e5236 100644
--- a/sentry-resque/lib/sentry/resque.rb
+++ b/sentry-resque/lib/sentry/resque.rb
@@ -32,7 +32,11 @@ def record(queue, worker, payload, &block)
 
               finish_transaction(transaction, 200)
             rescue Exception => exception
-              klass = payload['class'].constantize
+              klass = if payload['class'].respond_to?(:constantize)
+                payload['class'].constantize
+              else
+                Object.const_get(payload['class'])
+              end
 
               raise if Sentry.configuration.resque.report_after_job_retries &&
                        defined?(::Resque::Plugins::Retry) == 'constant' &&
diff --git a/sentry-resque/spec/sentry/resque_spec.rb b/sentry-resque/spec/sentry/resque_spec.rb
index b74f0ae27..2a4739b6f 100644
--- a/sentry-resque/spec/sentry/resque_spec.rb
+++ b/sentry-resque/spec/sentry/resque_spec.rb
@@ -208,11 +208,16 @@ def self.perform(msg)
     end
   end
 
-  context "with ActiveJob" do
+  rails_gems = begin
     require "rails"
     require "active_job"
     require "sentry-rails"
+    true
+  rescue LoadError
+    false
+  end
 
+  context "with ActiveJob" do
     class AJMessageJob < ActiveJob::Base
       self.queue_adapter = :resque
 
@@ -290,7 +295,7 @@ def perform
         expect(event[:contexts][:"Active-Job"][:job_class]).to eq("AJFailedJob")
       end
     end
-  end
+  end if rails_gems
 end
 
 
diff --git a/sentry-resque/spec/spec_helper.rb b/sentry-resque/spec/spec_helper.rb
index af12e6103..db37bf360 100644
--- a/sentry-resque/spec/spec_helper.rb
+++ b/sentry-resque/spec/spec_helper.rb
@@ -4,6 +4,9 @@
 require "resque"
 require "resque-retry"
 
+# Allow customization of the Redis instance used for tests
+Resque.redis = ENV["REDIS_URL"] if ENV.key?("REDIS_URL")
+
 # To workaround https://github.com/steveklabnik/mono_logger/issues/13
 # Note: mono_logger is resque's default logger
 Resque.logger = ::Logger.new(nil)