diff --git a/History.md b/History.md
index 103d68b230..888b9adfb5 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,8 @@
+## 5.2.1 / 2021-01-
+
+* Bugfixes
+  * MiniSSL::Socket#write - use data.byteslice(wrote..-1) ([#2543])
+
 ## 5.2.0 / 2021-01-27
 
 * Features
diff --git a/lib/puma/minissl.rb b/lib/puma/minissl.rb
index ff1e4bfe42..64534872fb 100644
--- a/lib/puma/minissl.rb
+++ b/lib/puma/minissl.rb
@@ -133,7 +133,7 @@ def write(data)
 
           return data_size if need == 0
 
-          data = data[wrote..-1]
+          data = data.byteslice(wrote..-1)
         end
       end