diff --git a/BRANCHES.md b/BRANCHES.md
index 6d2e5c0..f912e95 100644
--- a/BRANCHES.md
+++ b/BRANCHES.md
@@ -76,6 +76,6 @@
 - [`development`](https://github.com/Mbed-TLS/mbedtls/)
 - [`mbedtls-2.28`](https://github.com/Mbed-TLS/mbedtls/tree/mbedtls-2.28)
  maintained until at least the end of 2024, see
-  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.3>.
+  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.4>.
 
 Users are urged to always use the latest version of a maintained branch.
diff --git a/ChangeLog b/ChangeLog
index 4033839..67b72fc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,31 @@
 Mbed TLS ChangeLog (Sorted per branch, date)
 
+= Mbed TLS 2.28.4 branch released 2023-08-04
+
+Features
+   * Allow MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE to be set by
+     setting the CMake variable of the same name at configuration time.
+
+Bugfix
+   * Fix crypt_and_hash decryption fail when used with a stream cipher
+     mode of operation, due to the input not being a multiple of the block
+     size. Resolves #7417.
+   * Fix a bug where mbedtls_x509_string_to_names() would return success
+     when given a invalid name string, if it did not contain '=' or ','.
+   * Fix missing PSA initialization in sample programs when
+     MBEDTLS_USE_PSA_CRYPTO is enabled.
+   * Fix clang and armclang compilation error when targeting certain Arm
+     M-class CPUs (Cortex-M0, Cortex-M0+, Cortex-M1, Cortex-M23,
+     SecurCore SC000). Fixes #1077.
+   * Fixed an issue that caused compile errors when using CMake and the IAR
+     toolchain.
+   * Fix the build with MBEDTLS_PSA_INJECT_ENTROPY. Fixes #7516.
+   * Fix builds on Windows with clang.
+   * Fix compilation warnings in aes.c for certain combinations
+     of configuration options.
+   * Fix a compilation error on some platforms when including mbedtls/ssl.h
+     with all TLS support disabled. Fixes #6628.
+
 = Mbed TLS 2.28.3 branch released 2023-03-28
 
 Features
diff --git a/ChangeLog.d/armclang-compile-fix.txt b/ChangeLog.d/armclang-compile-fix.txt
deleted file mode 100644
index 93ad6af..0000000
--- a/ChangeLog.d/armclang-compile-fix.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-Bugfix
-   * Fix clang and armclang compilation error when targeting certain Arm
-     M-class CPUs (Cortex-M0, Cortex-M0+, Cortex-M1, Cortex-M23,
-     SecurCore SC000). Fixes #1077.
-
diff --git a/ChangeLog.d/bugfix_iar_typo.txt b/ChangeLog.d/bugfix_iar_typo.txt
deleted file mode 100644
index 95f97b1..0000000
--- a/ChangeLog.d/bugfix_iar_typo.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fixed an issue that caused compile errors when using CMake and the IAR
-     toolchain.
diff --git a/ChangeLog.d/cmake-pass-through-config-defines.txt b/ChangeLog.d/cmake-pass-through-config-defines.txt
deleted file mode 100644
index 6122f37..0000000
--- a/ChangeLog.d/cmake-pass-through-config-defines.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Features
-   * Allow MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE to be set by
-     setting the CMake variable of the same name at configuration time.
diff --git a/ChangeLog.d/fix-crypt_and_hash-decrypt-issue.txt b/ChangeLog.d/fix-crypt_and_hash-decrypt-issue.txt
deleted file mode 100644
index ded9b2d..0000000
--- a/ChangeLog.d/fix-crypt_and_hash-decrypt-issue.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-Bugfix
-   * Fix crypt_and_hash decryption fail when used with a stream cipher
-     mode of operation due to the input not being multiple of block size.
-     Resolves #7417.
diff --git a/ChangeLog.d/fix-string-to-names-retcode.txt b/ChangeLog.d/fix-string-to-names-retcode.txt
deleted file mode 100644
index ac4b3d1..0000000
--- a/ChangeLog.d/fix-string-to-names-retcode.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix a bug in which mbedtls_x509_string_to_names() would return success
-     when given a invalid name string if it did not contain '=' or ','.
diff --git a/ChangeLog.d/fix-tfm-build.txt b/ChangeLog.d/fix-tfm-build.txt
deleted file mode 100644
index a63bc2f..0000000
--- a/ChangeLog.d/fix-tfm-build.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix compilation warnings in aes.c for certain combinations
-     of configuration options.
diff --git a/ChangeLog.d/fix-win32-llvm-build.txt b/ChangeLog.d/fix-win32-llvm-build.txt
deleted file mode 100644
index 826551c..0000000
--- a/ChangeLog.d/fix-win32-llvm-build.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-Bugfix
-   * Fix builds on Windows with clang
diff --git a/ChangeLog.d/inject-entropy.txt b/ChangeLog.d/inject-entropy.txt
deleted file mode 100644
index 7626629..0000000
--- a/ChangeLog.d/inject-entropy.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-Bugfix
-   * Fix the build with MBEDTLS_PSA_INJECT_ENTROPY. Fixes #7516.
diff --git a/ChangeLog.d/programs_psa_fix.txt b/ChangeLog.d/programs_psa_fix.txt
deleted file mode 100644
index fe2099e..0000000
--- a/ChangeLog.d/programs_psa_fix.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix missing PSA initialization in sample programs when
-     MBEDTLS_USE_PSA_CRYPTO is enabled.
diff --git a/ChangeLog.d/ssl_premaster_secret-empty.txt b/ChangeLog.d/ssl_premaster_secret-empty.txt
deleted file mode 100644
index 0ce5f36..0000000
--- a/ChangeLog.d/ssl_premaster_secret-empty.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix a compilation error on some platforms when including mbedtls/ssl.h
-     with all TLS support disabled. Fixes #6628.
diff --git a/doxygen/input/doc_mainpage.h b/doxygen/input/doc_mainpage.h
index bbf4ea2..d19f93e 100644
--- a/doxygen/input/doc_mainpage.h
+++ b/doxygen/input/doc_mainpage.h
@@ -22,7 +22,7 @@
  */
 
 /**
- * @mainpage Mbed TLS v2.28.3 API Documentation
+ * @mainpage Mbed TLS v2.28.4 API Documentation
  *
  * This documentation describes the internal structure of Mbed TLS.  It was
  * automatically generated from specially formatted comment blocks in
diff --git a/doxygen/mbedtls.doxyfile b/doxygen/mbedtls.doxyfile
index 78299ed..2f22e3f 100644
--- a/doxygen/mbedtls.doxyfile
+++ b/doxygen/mbedtls.doxyfile
@@ -1,4 +1,4 @@
-PROJECT_NAME           = "mbed TLS v2.28.3"
+PROJECT_NAME           = "mbed TLS v2.28.4"
 OUTPUT_DIRECTORY       = ../apidoc/
 FULL_PATH_NAMES        = NO
 OPTIMIZE_OUTPUT_FOR_C  = YES
diff --git a/include/mbedtls/version.h b/include/mbedtls/version.h
index 0ef5213..1ae06e6 100644
--- a/include/mbedtls/version.h
+++ b/include/mbedtls/version.h
@@ -38,16 +38,16 @@
  */
 #define MBEDTLS_VERSION_MAJOR  2
 #define MBEDTLS_VERSION_MINOR  28
-#define MBEDTLS_VERSION_PATCH  3
+#define MBEDTLS_VERSION_PATCH  4
 
 /**
  * The single version number has the following structure:
  *    MMNNPP00
  *    Major version | Minor version | Patch version
  */
-#define MBEDTLS_VERSION_NUMBER         0x021C0300
-#define MBEDTLS_VERSION_STRING         "2.28.3"
-#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.28.3"
+#define MBEDTLS_VERSION_NUMBER         0x021C0400
+#define MBEDTLS_VERSION_STRING         "2.28.4"
+#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.28.4"
 
 #if defined(MBEDTLS_VERSION_C)
 
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index a159251..147caaf 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -204,15 +204,15 @@
 if(USE_SHARED_MBEDTLS_LIBRARY)
     set(CMAKE_LIBRARY_PATH ${CMAKE_CURRENT_BINARY_DIR})
     add_library(${mbedcrypto_target} SHARED ${src_crypto})
-    set_target_properties(${mbedcrypto_target} PROPERTIES VERSION 2.28.3 SOVERSION 7)
+    set_target_properties(${mbedcrypto_target} PROPERTIES VERSION 2.28.4 SOVERSION 7)
     target_link_libraries(${mbedcrypto_target} PUBLIC ${libs})
 
     add_library(${mbedx509_target} SHARED ${src_x509})
-    set_target_properties(${mbedx509_target} PROPERTIES VERSION 2.28.3 SOVERSION 1)
+    set_target_properties(${mbedx509_target} PROPERTIES VERSION 2.28.4 SOVERSION 1)
     target_link_libraries(${mbedx509_target} PUBLIC ${libs} ${mbedcrypto_target})
 
     add_library(${mbedtls_target} SHARED ${src_tls})
-    set_target_properties(${mbedtls_target} PROPERTIES VERSION 2.28.3 SOVERSION 14)
+    set_target_properties(${mbedtls_target} PROPERTIES VERSION 2.28.4 SOVERSION 14)
     target_link_libraries(${mbedtls_target} PUBLIC ${libs} ${mbedx509_target})
 endif(USE_SHARED_MBEDTLS_LIBRARY)
 
diff --git a/tests/suites/test_suite_version.data b/tests/suites/test_suite_version.data
index 4b57192..8226a68 100644
--- a/tests/suites/test_suite_version.data
+++ b/tests/suites/test_suite_version.data
@@ -1,8 +1,8 @@
 Check compile time library version
-check_compiletime_version:"2.28.3"
+check_compiletime_version:"2.28.4"
 
 Check runtime library version
-check_runtime_version:"2.28.3"
+check_runtime_version:"2.28.4"
 
 Check for MBEDTLS_VERSION_C
 check_feature:"MBEDTLS_VERSION_C":0