diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5277f66..be848ff 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0.3
+          ruby-version: 3.0.6
           bundler-cache: true
 
       - name: Run brakeman
@@ -25,7 +25,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0.3
+          ruby-version: 3.0.6
           bundler-cache: true
 
       - name: Run rubocop
@@ -54,7 +54,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0.3
+          ruby-version: 3.0.6
           bundler-cache: true
 
       - name: Run RSpec
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..d6608a7
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.0.6
diff --git a/Gemfile b/Gemfile
index fca54dd..b87b3a3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-ruby '3.0.3'
+ruby '3.0.6'
 
 source 'https://rubygems.org'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 7fe48fc..99e2be6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -319,7 +319,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 3.0.3p157
+   ruby 3.0.6p216
 
 BUNDLED WITH
-   2.2.32
+   2.2.33