diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 56c23893..fa87c7ea 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.50"
+  ".": "0.1.0-alpha.51"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6c99d38b..4aee27f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.1.0-alpha.51 (2025-10-14)
+
+Full Changelog: [v0.1.0-alpha.50...v0.1.0-alpha.51](https://github.com/lithic-com/lithic-ruby/compare/v0.1.0-alpha.50...v0.1.0-alpha.51)
+
+### Bug Fixes
+
+* should not reuse buffers for `IO.copy_stream` interop ([f6e4858](https://github.com/lithic-com/lithic-ruby/commit/f6e485884b92ac962d4cd4c61e913aac40fbc175))
+
 ## 0.1.0-alpha.50 (2025-10-08)
 
 Full Changelog: [v0.1.0-alpha.49...v0.1.0-alpha.50](https://github.com/lithic-com/lithic-ruby/compare/v0.1.0-alpha.49...v0.1.0-alpha.50)
diff --git a/Gemfile.lock b/Gemfile.lock
index 22b8e1ef..8fa02d31 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    lithic (0.1.0.pre.alpha.50)
+    lithic (0.1.0.pre.alpha.51)
       connection_pool
 
 GEM
diff --git a/README.md b/README.md
index 681db60f..58e03c0b 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "lithic", "~> 0.1.0.pre.alpha.50"
+gem "lithic", "~> 0.1.0.pre.alpha.51"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/lithic/internal/util.rb b/lib/lithic/internal/util.rb
index 1df75d90..d93a1d58 100644
--- a/lib/lithic/internal/util.rb
+++ b/lib/lithic/internal/util.rb
@@ -473,10 +473,9 @@ class << self
         # @return [Enumerable<String>]
         def writable_enum(&blk)
           Enumerator.new do |y|
-            buf = String.new
             y.define_singleton_method(:write) do
-              self << buf.replace(_1)
-              buf.bytesize
+              self << _1.dup
+              _1.bytesize
             end
 
             blk.call(y)
diff --git a/lib/lithic/version.rb b/lib/lithic/version.rb
index 67b696a7..e46f3895 100644
--- a/lib/lithic/version.rb
+++ b/lib/lithic/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Lithic
-  VERSION = "0.1.0.pre.alpha.50"
+  VERSION = "0.1.0.pre.alpha.51"
 end