diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2a1b273..6aa2b7f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,7 +4,7 @@ executors:
     parameters:
       version:
         description: "Ruby version number"
-        default: "3.2.0"
+        default: "3.2.1"
         type: string
     docker:
       - image: cimg/ruby:<< parameters.version >>
@@ -15,7 +15,7 @@ commands:
     parameters:
       version:
         description: "Ruby version number"
-        default: "3.2.0"
+        default: "3.2.1"
         type: string
     steps:
       - restore_cache:
@@ -44,7 +44,7 @@ jobs:
     parameters:
       version:
         description: "Ruby version number"
-        default: "3.2.0"
+        default: "3.2.1"
         type: string
     executor:
       name: ruby
@@ -65,14 +65,14 @@ workflows:
       - test:
           matrix:
             parameters:
-              version: ["2.7.5", "3.0.3", "3.1.3", "3.2.0"]
+              version: ["2.7.5", "3.0.3", "3.1.3", "3.2.1"]
   cron-workflow:
     jobs:
       - rubocop
       - test:
           matrix:
             parameters:
-              version: ["2.7.5", "3.0.3", "3.1.3", "3.2.0"]
+              version: ["2.7.5", "3.0.3", "3.1.3", "3.2.1"]
     triggers:
       - schedule:
           cron: "0 13 * * 6"
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..e4604e3
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.2.1
diff --git a/Gemfile.lock b/Gemfile.lock
index 3048b3b..b1f3d3a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,6 +53,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-21
+  arm64-darwin-22
   x86_64-linux
 
 DEPENDENCIES
@@ -69,4 +70,4 @@ DEPENDENCIES
   wordexp!
 
 BUNDLED WITH
-   2.4.3
+   2.4.6