diff --git a/.circleci/config.yml b/.circleci/config.yml
index bc6c34c..544ca59 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -18,7 +18,7 @@ parameters:
     default: main
   default-ruby:
     type: string
-    default: "3.3.7"
+    default: 3.3.8
 
 # Define common YAML anchors
 x-common-auth: &common-auth
@@ -299,7 +299,7 @@ workflows:
           matrix:
             parameters:
               os: ["docker", "macos"]
-              ruby-version: ["3.3.7", "3.2.3", "3.1.6"]
+              ruby-version: ["3.3.8", "3.2.3", "3.1.6"]
           filters:
             tags:
               only: /^\d+\.\d+\.\d+$/
diff --git a/.tool-versions b/.tool-versions
index 2ba566b..e12c94f 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1 +1 @@
-ruby 3.3.7 3.2.3 3.1.6
+ruby 3.3.8 3.2.3 3.1.6