diff --git a/Cargo.lock b/Cargo.lock
index 001e664..e7c402e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -277,18 +277,18 @@ dependencies = [
 
 [[package]]
 name = "rb-sys"
-version = "0.9.87"
+version = "0.9.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "225103e3d69bbfe8831f9fd0d2461335f3a9dd06aa6e88bcb6d6970383494d06"
+checksum = "eb81203e271055178603e243fee397f5f4aac125bcd20036279683fb1445a899"
 dependencies = [
  "rb-sys-build",
 ]
 
 [[package]]
 name = "rb-sys-build"
-version = "0.9.87"
+version = "0.9.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bacce8095a5167d5ede618bbd9353e9d9e2f32ddaf54be911106f0ee6baacf09"
+checksum = "9de9403a6aac834e7c9534575cb14188b6b5b99bafe475d18d838d44fbc27d31"
 dependencies = [
  "bindgen",
  "lazy_static",
diff --git a/Gemfile.lock b/Gemfile.lock
index e436b4f..5213882 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     tiktoken_ruby (0.0.8)
-      rb_sys (= 0.9.87)
+      rb_sys (= 0.9.91)
 
 GEM
   remote: https://rubygems.org/
@@ -22,7 +22,7 @@ GEM
     rake (13.1.0)
     rake-compiler (1.2.5)
       rake
-    rb_sys (0.9.87)
+    rb_sys (0.9.91)
     regexp_parser (2.9.0)
     rexml (3.2.6)
     rspec (3.12.0)
diff --git a/ext/tiktoken_ruby/Cargo.toml b/ext/tiktoken_ruby/Cargo.toml
index 2d1df26..c27b663 100644
--- a/ext/tiktoken_ruby/Cargo.toml
+++ b/ext/tiktoken_ruby/Cargo.toml
@@ -11,5 +11,5 @@ crate-type = ["cdylib"]
 
 [dependencies]
 magnus = { version = "0.6.1" }
-rb-sys = { version = "0.9.87", features = ["stable-api-compiled-fallback"] }
+rb-sys = { version = "0.9.91", features = ["stable-api-compiled-fallback"] }
 tiktoken-rs = { git = "https://github.com/IAPark/tiktoken-rs.git" }
diff --git a/tiktoken_ruby.gemspec b/tiktoken_ruby.gemspec
index 981a4ee..780515a 100644
--- a/tiktoken_ruby.gemspec
+++ b/tiktoken_ruby.gemspec
@@ -29,5 +29,5 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
   spec.extensions = ["ext/tiktoken_ruby/extconf.rb"]
-  spec.add_dependency "rb_sys", "= 0.9.87"
+  spec.add_dependency "rb_sys", "= 0.9.91"
 end