diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fdc5019..fcf0e97 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ["ruby-head", "4.0", "3.4", "3.3", "3.2"]
+        ruby: ["ruby-head", "4.0", "3.4", "3.3"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v7
diff --git a/Gemfile.lock b/Gemfile.lock
index 840d89e..c3244b7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,4 +96,4 @@ DEPENDENCIES
   yard-doctest
 
 BUNDLED WITH
-   2.6.9
+  4.0.23
diff --git a/tiktoken_ruby.gemspec b/tiktoken_ruby.gemspec
index e0013f4..8e17cfa 100644
--- a/tiktoken_ruby.gemspec
+++ b/tiktoken_ruby.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
     "count the number of tokens in text before sending it to OpenAI APIs."
   spec.homepage = "https://github.com/IAPark/tiktoken_ruby"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.2.0"
+  spec.required_ruby_version = ">= 3.3.0"
   spec.required_rubygems_version = ">= 3.4.0"
   spec.platform = Gem::Platform::RUBY