diff --git a/CHANGELOG b/CHANGELOG
index e94eafc..f9d592a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,14 @@
+Version 1.5.3:
+  * Fix compile bug preventing compilation on Ubuntu Focal and later
+  * Fix valgrind and address santizer errors that caused runtime crashes and CI failures
+  * Transition unit tests to use CMake's ctest
+  * Refactor exr_write() function in ctlrender 
+  * Add support for OpenEXR 3 while retaining support for OpenEXR 2
+  * Add unit tests for ctlrender, exr_ctl_exr and exrdpx executables
+  * Modernize the CMake build process to support more platforms (Mac, Linux and Windows) 
+  * Add CI to build and test on many platforms
+  * Add docker containers
+
 Version 1.5:
   * added OpenEXR_CTL, ctlrender
   * changed build system to Cmake
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7636841..28fae87 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.12)
-project(CTL VERSION 1.5.2)
+project(CTL VERSION 1.5.3)
 include(GNUInstallDirs)
 
 set(CMAKE_CXX_STANDARD 11)
diff --git a/README.md b/README.md
index 9635786..b320515 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,6 @@ downloaded from http://www.openexr.com or use one of the commands below.
     
             $ brew install ilmBase
 
-
 ### Suggested ###
 
 __OpenEXR__
@@ -152,7 +151,7 @@ If you want to use CTL together with the TIFF image file format, you should down
 
 __ACES Container__
 
-ctlrender is able to write files compliant with SMPTE S2065-4. This
+ctlrender is able to write files compliant with SMPTE ST2065-4. This
 functionality requires the aces_container library, the latest version of which 
 can be downloaded from https://github.com/ampas/aces_container
 
@@ -180,7 +179,6 @@ can be downloaded from https://github.com/ampas/aces_container
     
             $ brew install --head ctl
 
-
 * Redhat, Ubuntu
 
     from the root source directory:
@@ -192,7 +190,7 @@ can be downloaded from https://github.com/ampas/aces_container
 
     to run the optional unit tests:
 
-        $ sudo make check
+        $ ctest
 
 * Docker
 
diff --git a/vcpkg.json b/vcpkg.json
index 30e9cb4..7b1adbc 100644
--- a/vcpkg.json
+++ b/vcpkg.json
@@ -1,6 +1,6 @@
 {
     "name": "ctl", 
-    "version": "1.5.2",
+    "version": "1.5.3",
     "dependencies": [
         "imath",
         "openexr",