diff --git a/.github/workflows/devcontainer.yml b/.github/workflows/devcontainer.yml
index 0f3daeb..e110903 100644
--- a/.github/workflows/devcontainer.yml
+++ b/.github/workflows/devcontainer.yml
@@ -5,9 +5,6 @@ on:
     - cron: "0 6 1 * *"  # 1st of every month at 6:00 AM UTC
   workflow_dispatch:
 
-env:
-  RUBYOPT: "-w"
-
 jobs:
   test:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/jruby_head.yml b/.github/workflows/jruby_head.yml
index b25ec8d..d22f398 100644
--- a/.github/workflows/jruby_head.yml
+++ b/.github/workflows/jruby_head.yml
@@ -72,4 +72,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.github/workflows/ruby_head.yml b/.github/workflows/ruby_head.yml
index 77f4d0e..ca9b916 100644
--- a/.github/workflows/ruby_head.yml
+++ b/.github/workflows/ruby_head.yml
@@ -78,4 +78,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2fa9456..4dbfe81 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -90,4 +90,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.github/workflows/test_11g.yml b/.github/workflows/test_11g.yml
index 04e3347..88a2ddc 100644
--- a/.github/workflows/test_11g.yml
+++ b/.github/workflows/test_11g.yml
@@ -96,4 +96,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.github/workflows/test_11g_ojdbc11.yml b/.github/workflows/test_11g_ojdbc11.yml
index 02ee216..3078128 100644
--- a/.github/workflows/test_11g_ojdbc11.yml
+++ b/.github/workflows/test_11g_ojdbc11.yml
@@ -91,4 +91,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.github/workflows/test_gemfiles.yml b/.github/workflows/test_gemfiles.yml
index 83f3ead..bbca844 100644
--- a/.github/workflows/test_gemfiles.yml
+++ b/.github/workflows/test_gemfiles.yml
@@ -104,4 +104,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.github/workflows/truffleruby.yml b/.github/workflows/truffleruby.yml
index b4eeeda..1897b40 100644
--- a/.github/workflows/truffleruby.yml
+++ b/.github/workflows/truffleruby.yml
@@ -79,4 +79,4 @@ jobs:
         bundle install --jobs 4 --retry 3
     - name: Run RSpec
       run: |
-        RUBYOPT=-w bundle exec rspec
+        bundle exec rspec
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..ff607fd
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,4 @@
+--force-color
+--backtrace
+--require spec_helper
+--warnings