diff --git a/CHANGES.txt b/CHANGES.txt
index 770f859163..fdaa0651fd 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -81,6 +81,17 @@
   * Print full path name of source .proto file on error
   * Include proto message type in the annotation comments.
 
+2022-10-26 version 21.9 (C++/Java/Python/PHP/Objective-C/C#/Ruby)
+
+  C++
+  * Update zlib to 1.2.13 (#10819)
+
+  Python
+  * Target MacOS 10.9 to fix #10799 (#10807)
+
+  Ruby
+  * Replace libc strdup usage with internal impl to restore musl compat (#10818)
+
 2022-10-18 version 21.8 (C++/Java/Python/PHP/Objective-C/C#/Ruby)
 
   Other
diff --git a/Protobuf-C++.podspec b/Protobuf-C++.podspec
index 54a962d13e..22da2c1697 100644
--- a/Protobuf-C++.podspec
+++ b/Protobuf-C++.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name     = 'Protobuf-C++'
-  s.version  = '3.21.8'
+  s.version  = '3.21.9'
   s.summary  = 'Protocol Buffers v3 runtime library for C++.'
   s.homepage = 'https://github.com/google/protobuf'
   s.license  = 'BSD-3-Clause'
diff --git a/Protobuf.podspec b/Protobuf.podspec
index 48fceea36f..7f003c37e1 100644
--- a/Protobuf.podspec
+++ b/Protobuf.podspec
@@ -5,7 +5,7 @@
 # dependent projects use the :git notation to refer to the library.
 Pod::Spec.new do |s|
   s.name     = 'Protobuf'
-  s.version  = '3.21.8'
+  s.version  = '3.21.9'
   s.summary  = 'Protocol Buffers v.3 runtime library for Objective-C.'
   s.homepage = 'https://github.com/protocolbuffers/protobuf'
   s.license  = 'BSD-3-Clause'
diff --git a/csharp/Google.Protobuf.Tools.nuspec b/csharp/Google.Protobuf.Tools.nuspec
index 64f78d0b3e..c909720743 100644
--- a/csharp/Google.Protobuf.Tools.nuspec
+++ b/csharp/Google.Protobuf.Tools.nuspec
@@ -5,7 +5,7 @@
     <title>Google Protocol Buffers tools</title>
     <summary>Tools for Protocol Buffers - Google's data interchange format.</summary>
     <description>See project site for more info.</description>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
     <authors>Google Inc.</authors>
     <owners>protobuf-packages</owners>
     <licenseUrl>https://github.com/protocolbuffers/protobuf/blob/main/LICENSE</licenseUrl>
diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
index 9828fc5b5f..bed643fd49 100644
--- a/csharp/src/Google.Protobuf/Google.Protobuf.csproj
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -5,7 +5,7 @@
     <Description>C# runtime library for Protocol Buffers - Google's data interchange format.</Description>
     <Copyright>Copyright 2015, Google Inc.</Copyright>
     <AssemblyTitle>Google Protocol Buffers</AssemblyTitle>
-    <VersionPrefix>3.21.8</VersionPrefix>
+    <VersionPrefix>3.21.9</VersionPrefix>
     <LangVersion>10.0</LangVersion>
     <Authors>Google Inc.</Authors>
     <TargetFrameworks>netstandard1.1;netstandard2.0;net45;net50</TargetFrameworks>
diff --git a/java/README.md b/java/README.md
index 798ce212f6..c9fab2537f 100644
--- a/java/README.md
+++ b/java/README.md
@@ -23,7 +23,7 @@ If you are using Maven, use the following:
 <dependency>
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-java</artifactId>
-  <version>3.21.8</version>
+  <version>3.21.9</version>
 </dependency>
 ```
 
@@ -37,7 +37,7 @@ protobuf-java-util package:
 <dependency>
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-java-util</artifactId>
-  <version>3.21.8</version>
+  <version>3.21.9</version>
 </dependency>
 ```
 
@@ -45,7 +45,7 @@ protobuf-java-util package:
 
 If you are using Gradle, add the following to your `build.gradle` file's dependencies:
 ```
-    implementation 'com.google.protobuf:protobuf-java:3.21.8'
+    implementation 'com.google.protobuf:protobuf-java:3.21.9'
 ```
 Again, be sure to check that the version number matches (or is newer than) the version number of protoc that you are using.
 
diff --git a/java/bom/pom.xml b/java/bom/pom.xml
index ebbad006ea..19e23fb196 100644
--- a/java/bom/pom.xml
+++ b/java/bom/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-bom</artifactId>
-  <version>3.21.8</version>
+  <version>3.21.9</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [BOM]</name>
diff --git a/java/core/pom.xml b/java/core/pom.xml
index bedb61b915..c920d1fe91 100644
--- a/java/core/pom.xml
+++ b/java/core/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
   </parent>
 
   <artifactId>protobuf-java</artifactId>
diff --git a/java/kotlin-lite/pom.xml b/java/kotlin-lite/pom.xml
index ace12aa6fa..86da157fd0 100644
--- a/java/kotlin-lite/pom.xml
+++ b/java/kotlin-lite/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
   </parent>
 
   <artifactId>protobuf-kotlin-lite</artifactId>
diff --git a/java/kotlin/pom.xml b/java/kotlin/pom.xml
index 27be007720..6ba0f8b74f 100644
--- a/java/kotlin/pom.xml
+++ b/java/kotlin/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
   </parent>
 
   <artifactId>protobuf-kotlin</artifactId>
diff --git a/java/lite.md b/java/lite.md
index 87b917a7bd..eef237052a 100644
--- a/java/lite.md
+++ b/java/lite.md
@@ -29,7 +29,7 @@ protobuf Java Lite runtime. If you are using Maven, include the following:
 <dependency>
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-javalite</artifactId>
-  <version>3.21.8</version>
+  <version>3.21.9</version>
 </dependency>
 ```
 
diff --git a/java/lite/pom.xml b/java/lite/pom.xml
index 8075e75efd..6df3415d5b 100644
--- a/java/lite/pom.xml
+++ b/java/lite/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
   </parent>
 
   <artifactId>protobuf-javalite</artifactId>
diff --git a/java/pom.xml b/java/pom.xml
index ad8628219b..6cda0a3d99 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-parent</artifactId>
-  <version>3.21.8</version>
+  <version>3.21.9</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [Parent]</name>
diff --git a/java/util/pom.xml b/java/util/pom.xml
index 1c0ee7b687..14209ff01c 100644
--- a/java/util/pom.xml
+++ b/java/util/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
   </parent>
 
   <artifactId>protobuf-java-util</artifactId>
diff --git a/php/ext/google/protobuf/package.xml b/php/ext/google/protobuf/package.xml
index 462b405bd5..ecffa138f1 100644
--- a/php/ext/google/protobuf/package.xml
+++ b/php/ext/google/protobuf/package.xml
@@ -10,11 +10,11 @@
   <email>protobuf-packages@google.com</email>
   <active>yes</active>
  </lead>
- <date>2022-10-13</date>
- <time>11:40:58</time>
+ <date>2022-10-26</date>
+ <time>09:08:50</time>
  <version>
-  <release>3.21.8</release>
-  <api>3.21.8</api>
+  <release>3.21.9</release>
+  <api>3.21.9</api>
  </version>
  <stability>
   <release>stable</release>
@@ -1449,5 +1449,20 @@ G  A release.
    <notes>
    </notes>
   </release>
+  <release>
+   <version>
+    <release>3.21.9</release>
+    <api>3.21.9</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2022-10-26</date>
+   <time>09:08:50</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">BSD-3-Clause</license>
+   <notes>
+   </notes>
+  </release>
  </changelog>
 </package>
diff --git a/php/ext/google/protobuf/protobuf.h b/php/ext/google/protobuf/protobuf.h
index 14bd16c40d..25689498df 100644
--- a/php/ext/google/protobuf/protobuf.h
+++ b/php/ext/google/protobuf/protobuf.h
@@ -127,7 +127,7 @@ ZEND_BEGIN_ARG_INFO_EX(arginfo_setter, 0, 0, 1)
   ZEND_ARG_INFO(0, value)
 ZEND_END_ARG_INFO()
 
-#define PHP_PROTOBUF_VERSION "3.21.8"
+#define PHP_PROTOBUF_VERSION "3.21.9"
 
 // ptr -> PHP object cache. This is a weak map that caches lazily-created
 // wrapper objects around upb types:
diff --git a/protobuf_version.bzl b/protobuf_version.bzl
index cc6cf85c55..4c44f3da5d 100644
--- a/protobuf_version.bzl
+++ b/protobuf_version.bzl
@@ -1,3 +1,3 @@
-PROTOC_VERSION = "21.8"
-PROTOBUF_JAVA_VERSION = "3.21.8"
-PROTOBUF_PYTHON_VERSION = "4.21.8"
+PROTOC_VERSION = "21.9"
+PROTOBUF_JAVA_VERSION = "3.21.9"
+PROTOBUF_PYTHON_VERSION = "4.21.9"
diff --git a/python/google/protobuf/__init__.py b/python/google/protobuf/__init__.py
index 6b0df47af0..e7b197e5d1 100644
--- a/python/google/protobuf/__init__.py
+++ b/python/google/protobuf/__init__.py
@@ -30,4 +30,4 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '4.21.8'
+__version__ = '4.21.9'
diff --git a/ruby/google-protobuf.gemspec b/ruby/google-protobuf.gemspec
index 5f226b0fec..43933eb081 100644
--- a/ruby/google-protobuf.gemspec
+++ b/ruby/google-protobuf.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = "google-protobuf"
-  s.version     = "3.21.8"
+  s.version     = "3.21.9"
   git_tag       = "v#{s.version.to_s.sub('.rc.', '-rc')}" # Converts X.Y.Z.rc.N to vX.Y.Z-rcN, used for the git tag
   s.licenses    = ["BSD-3-Clause"]
   s.summary     = "Protocol Buffers"
diff --git a/ruby/pom.xml b/ruby/pom.xml
index c533dd7848..04ffaa823e 100644
--- a/ruby/pom.xml
+++ b/ruby/pom.xml
@@ -9,7 +9,7 @@
 
     <groupId>com.google.protobuf.jruby</groupId>
     <artifactId>protobuf-jruby</artifactId>
-    <version>3.21.8</version>
+    <version>3.21.9</version>
     <name>Protocol Buffer JRuby native extension</name>
     <description>
       Protocol Buffers are a way of encoding structured data in an efficient yet
@@ -76,7 +76,7 @@
         <dependency>
           <groupId>com.google.protobuf</groupId>
           <artifactId>protobuf-java-util</artifactId>
-          <version>3.21.8</version>
+          <version>3.21.9</version>
         </dependency>
         <dependency>
             <groupId>org.jruby</groupId>
diff --git a/src/google/protobuf/any.pb.h b/src/google/protobuf/any.pb.h
index 9921be577b..ef4109d0c3 100644
--- a/src/google/protobuf/any.pb.h
+++ b/src/google/protobuf/any.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/api.pb.h b/src/google/protobuf/api.pb.h
index cbfd5fce93..ea210ec6f4 100644
--- a/src/google/protobuf/api.pb.h
+++ b/src/google/protobuf/api.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/compiler/plugin.pb.h b/src/google/protobuf/compiler/plugin.pb.h
index 802de61516..a0b9161050 100644
--- a/src/google/protobuf/compiler/plugin.pb.h
+++ b/src/google/protobuf/compiler/plugin.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/descriptor.pb.h b/src/google/protobuf/descriptor.pb.h
index 39553f81ce..b297004a9e 100644
--- a/src/google/protobuf/descriptor.pb.h
+++ b/src/google/protobuf/descriptor.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/duration.pb.h b/src/google/protobuf/duration.pb.h
index a3f393a931..e347599a00 100644
--- a/src/google/protobuf/duration.pb.h
+++ b/src/google/protobuf/duration.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/empty.pb.h b/src/google/protobuf/empty.pb.h
index 807dc9cd19..9f118e5db3 100644
--- a/src/google/protobuf/empty.pb.h
+++ b/src/google/protobuf/empty.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/field_mask.pb.h b/src/google/protobuf/field_mask.pb.h
index 3a181fd5df..94e3d77e15 100644
--- a/src/google/protobuf/field_mask.pb.h
+++ b/src/google/protobuf/field_mask.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/port_def.inc b/src/google/protobuf/port_def.inc
index ddf769ec63..74a08c7fbd 100644
--- a/src/google/protobuf/port_def.inc
+++ b/src/google/protobuf/port_def.inc
@@ -217,7 +217,7 @@
 #ifdef PROTOBUF_VERSION
 #error PROTOBUF_VERSION was previously defined
 #endif
-#define PROTOBUF_VERSION 3021008
+#define PROTOBUF_VERSION 3021009
 
 #ifdef PROTOBUF_MIN_HEADER_VERSION_FOR_PROTOC
 #error PROTOBUF_MIN_HEADER_VERSION_FOR_PROTOC was previously defined
diff --git a/src/google/protobuf/source_context.pb.h b/src/google/protobuf/source_context.pb.h
index 5517333da8..6794cc54a2 100644
--- a/src/google/protobuf/source_context.pb.h
+++ b/src/google/protobuf/source_context.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/struct.pb.h b/src/google/protobuf/struct.pb.h
index 5b0fe1bb36..8eead0ab2c 100644
--- a/src/google/protobuf/struct.pb.h
+++ b/src/google/protobuf/struct.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/stubs/common.h b/src/google/protobuf/stubs/common.h
index 184100f8ae..29a0ffce6c 100644
--- a/src/google/protobuf/stubs/common.h
+++ b/src/google/protobuf/stubs/common.h
@@ -99,7 +99,7 @@ namespace internal {
 
 // The current version, represented as a single integer to make comparison
 // easier:  major * 10^6 + minor * 10^3 + micro
-#define GOOGLE_PROTOBUF_VERSION 3021008
+#define GOOGLE_PROTOBUF_VERSION 3021009
 
 // A suffix string for alpha, beta or rc releases. Empty for stable releases.
 #define GOOGLE_PROTOBUF_VERSION_SUFFIX ""
diff --git a/src/google/protobuf/timestamp.pb.h b/src/google/protobuf/timestamp.pb.h
index d752b99617..9b19abbeff 100644
--- a/src/google/protobuf/timestamp.pb.h
+++ b/src/google/protobuf/timestamp.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/type.pb.h b/src/google/protobuf/type.pb.h
index 423cede905..cd31a4bf94 100644
--- a/src/google/protobuf/type.pb.h
+++ b/src/google/protobuf/type.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."
diff --git a/src/google/protobuf/wrappers.pb.h b/src/google/protobuf/wrappers.pb.h
index 85837b8cb1..1f0ac0f74b 100644
--- a/src/google/protobuf/wrappers.pb.h
+++ b/src/google/protobuf/wrappers.pb.h
@@ -15,7 +15,7 @@
 #error "your headers."
 #endif  // PROTOBUF_VERSION
 
-#if 3021008 < PROTOBUF_MIN_PROTOC_VERSION
+#if 3021009 < PROTOBUF_MIN_PROTOC_VERSION
 #error "This file was generated by an older version of protoc which is"
 #error "incompatible with your Protocol Buffer headers. Please"
 #error "regenerate this file with a newer version of protoc."