diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 254eb0544..645351eec 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -185,7 +185,7 @@ jobs:
           CIBW_ARCHS_LINUX: native
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
           CIBW_MANYLINUX_AARCH64_IMAGE: manylinux2014
-          MACOSX_DEPLOYMENT_TARGET: 10.14
+          MACOSX_DEPLOYMENT_TARGET: 10.15
 
       - uses: actions/upload-artifact@v4
         with:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b754c82de..e53f335c7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ set(OTIO_AUTHOR_EMAIL "otio-discussion@lists.aswf.io")
 set(OTIO_LICENSE      "Modified Apache 2.0 License")
 
 set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64" CACHE STRING "")
-set(CMAKE_OSX_DEPLOYMENT_TARGET "10.14" CACHE STRING "Minimum OS X deployment version")
+set(CMAKE_OSX_DEPLOYMENT_TARGET "10.15" CACHE STRING "Minimum OS X deployment version")
 
 project(OpenTimelineIO VERSION ${OTIO_VERSION} LANGUAGES C CXX)