diff --git a/.github/workflows/sentry_rails_test.yml b/.github/workflows/sentry_rails_test.yml
index 306cef080..3084ff8e4 100644
--- a/.github/workflows/sentry_rails_test.yml
+++ b/.github/workflows/sentry_rails_test.yml
@@ -81,8 +81,6 @@ jobs:
             rails_version: "8.0.0"
           - ruby_version: "3.4"
             rails_version: "8.0.0"
-          - ruby_version: "jruby"
-            rails_version: 6.1.0
           - ruby_version: "3.2"
             rails_version: 7.1.0
             options:
diff --git a/sentry-ruby/spec/sentry/client_spec.rb b/sentry-ruby/spec/sentry/client_spec.rb
index a87e81fea..f455f6ca6 100644
--- a/sentry-ruby/spec/sentry/client_spec.rb
+++ b/sentry-ruby/spec/sentry/client_spec.rb
@@ -201,10 +201,10 @@ def sentry_context
       event = nil
 
       t = Thread.new do
+        Thread.current.name = "Thread 1"
         event = subject.event_from_message(message)
       end
 
-      t.name = "Thread 1"
       t.join
       hash = event.to_hash
 
@@ -321,15 +321,15 @@ def sentry_context
         version = Gem::Version.new(RUBY_VERSION)
 
         case
-        when version >= Gem::Version.new("3.4.0-dev")
+        when version >= Gem::Version.new("3.4.0-dev") && RUBY_ENGINE == "ruby"
           expect(hash[:exception][:values][0][:value]).to eq(
             "undefined method '[]' for nil (NoMethodError)\n\n          {}[:foo][:bar]\n                  ^^^^^^"
           )
-        when version >= Gem::Version.new("3.3.0-dev")
+        when version >= Gem::Version.new("3.3.0-dev") && RUBY_ENGINE == "ruby"
           expect(hash[:exception][:values][0][:value]).to eq(
             "undefined method `[]' for nil (NoMethodError)\n\n          {}[:foo][:bar]\n                  ^^^^^^"
           )
-        when version >= Gem::Version.new("3.2")
+        when version >= Gem::Version.new("3.2") && RUBY_ENGINE == "ruby"
           expect(hash[:exception][:values][0][:value]).to eq(
             "undefined method `[]' for nil:NilClass (NoMethodError)\n\n          {}[:foo][:bar]\n                  ^^^^^^"
           )
@@ -365,10 +365,10 @@ def detailed_message(*)
       event = nil
 
       t = Thread.new do
+        Thread.current.name = "Thread 1"
         event = subject.event_from_exception(exception)
       end
 
-      t.name = "Thread 1"
       t.join
 
       event_hash = event.to_hash
diff --git a/sentry-ruby/spec/sentry/vernier/profiler_spec.rb b/sentry-ruby/spec/sentry/vernier/profiler_spec.rb
index 7b0398a66..b8ef3a105 100644
--- a/sentry-ruby/spec/sentry/vernier/profiler_spec.rb
+++ b/sentry-ruby/spec/sentry/vernier/profiler_spec.rb
@@ -2,7 +2,7 @@
 
 require "sentry/vernier/profiler"
 
-RSpec.describe Sentry::Vernier::Profiler, when: { ruby_version?: [:>=, "3.3"] } do
+RSpec.describe Sentry::Vernier::Profiler, when: { ruby_version?: [:>=, "3.3"], ruby_engine?: "ruby" } do
   subject(:profiler) { described_class.new(Sentry.configuration) }
 
   before do
@@ -264,7 +264,7 @@
           expect(thread2[:name]).to eq("thread-bar-1")
         end
 
-        it 'has correct frames', when: { ruby_version?: [:>=, "3.3"] } do
+        it 'has correct frames', when: { ruby_version?: [:>=, "3.3"], ruby_engine?: "ruby" } do
           frames = profiler.to_hash[:profile][:frames]
 
           foo_frame = frames.find { |f| f[:function] =~ /foo/ }
@@ -277,7 +277,7 @@
           expect(foo_frame[:abs_path]).to include('sentry-ruby/spec/support/profiler.rb')
         end
 
-        it 'has correct stacks', when: { ruby_version?: [:>=, "3.3"] } do
+        it 'has correct stacks', when: { ruby_version?: [:>=, "3.3"], ruby_engine?: "ruby" } do
           profile = profiler.to_hash[:profile]
           frames = profile[:frames]
           stacks = profile[:stacks]