diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d8b464ecb..eb05bff45 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -179,8 +179,9 @@ jobs:
       CMAKE_CXX_STANDARD: 17
       PYTHON_VERSION: 3.9
       USE_SIMD: avx2,f16c
+      OPENCOLORIO_VERSION: v2.1.0
       OPENEXR_VERSION: v3.1.1
-      OPENIMAGEIO_VERSION: dev-2.3
+      OPENIMAGEIO_VERSION: release
       PYBIND11_VERSION: v2.7.1
     steps:
       - uses: actions/checkout@v2
@@ -471,7 +472,7 @@ jobs:
   linux-latest-release:
     # Test against development master for relevant dependencies, latest
     # supported releases of everything else.
-    name: "Linux latest releases: gcc10/C++17, llvm12, oiio-master, py3.8, boost1.71, exr3.1, ocio2.0, avx2"
+    name: "Linux latest releases: gcc10/C++17, llvm12, oiio-2.3, py3.8, boost1.71, exr3.1, ocio2.1, avx2"
     runs-on: ubuntu-20.04
     env:
       CXX: g++-10
@@ -481,9 +482,9 @@ jobs:
       LLVM_DISTRO_NAME: ubuntu-20.04
       USE_SIMD: avx2,f16c
       OPENEXR_VERSION: v3.1.0
-      OPENIMAGEIO_VERSION: master
+      OPENIMAGEIO_VERSION: release
       OPENIMAGEIO_CMAKE_FLAGS: -DBUILD_FMT_VERSION=8.0.0
-      OPENCOLORIO_VERSION: v2.0.1
+      OPENCOLORIO_VERSION: v2.1.0
       PUGIXML_VERSION: v1.11.4
       PYBIND11_VERSION: v2.7.1
       PYTHON_VERSION: 3.8
diff --git a/CHANGES.md b/CHANGES.md
index 24978b357..44b11919d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,12 @@
 <!-- SPDX-License-Identifier: CC-BY-4.0 -->
 <!-- Copyright Contributors to the Open Shading Language Project. -->
 
+Release 1.11.15.0 -- 1 Sep 2021 (compared to 1.11.14.2)
+-------------------------------------------------------
+* Changes for compatibility with OpenImageIO 2.3. #1393 #1388
+* Fix potential crashes (or at least undefined behavior) due to missing
+  virtual destructor of internal Symbol type. #1397
+
 Release 1.11.14.2 -- 1 Jul 2021 (compared to 1.11.14.1)
 -------------------------------------------------------
 * Fix warnings that occur when compiling with clang and C++17 mode. #1379
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 103190314..c3607fd23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@
 # https://github.com/AcademySoftwareFoundation/OpenShadingLanguage
 
 cmake_minimum_required (VERSION 3.12)
-project (OSL VERSION 1.11.14.2
+project (OSL VERSION 1.11.15.0
          LANGUAGES CXX C
          HOMEPAGE_URL "https://github.com/AcademySoftwareFoundation/OpenShadingLanguage")
 set (PROJ_NAME ${PROJECT_NAME})    # short name