diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 19d03b571..423c8810b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-15, windows-latest]
+        os: [warp-ubuntu-latest-x64-16x, warp-macos-15-arm64-12x, warp-windows-latest-x64-32x]
     env:
       CMAKE_BUILD_TYPE: Release
       CCACHE_DIR: ${{ github.workspace }}/.ccache
diff --git a/engine/CMakeLists.txt b/engine/CMakeLists.txt
index 9ce6f3dfc..edc3a0409 100644
--- a/engine/CMakeLists.txt
+++ b/engine/CMakeLists.txt
@@ -170,7 +170,15 @@ if (OAK_ENABLE_DYNAMIC_RENDER_BACKEND)
             render/opengl/openglrenderer.cpp
             render/opengl/openglrenderer.h
     )
-    target_link_libraries(oakgl PRIVATE oakengine)
+    if (WIN32)
+        # Engine-internal C++ symbols (olive::Renderer, FileFunctions, ...) are
+        # not exported from liboakengine.dll; embed the object library like the
+        # engine tests do. MinGW compares type_info by name, so cross-DLL RTTI
+        # with the shared engine still works.
+        target_link_libraries(oakgl PRIVATE oakengine-obj)
+    else ()
+        target_link_libraries(oakgl PRIVATE oakengine)
+    endif ()
     if (COMMAND oak_copy_otio_runtime)
         oak_copy_otio_runtime(oakgl)
     endif()
@@ -197,7 +205,12 @@ if (OAK_ENABLE_DYNAMIC_RENDER_BACKEND)
                 render/vulkan/vulkanrenderer.cpp
                 render/vulkan/vulkanrenderer.h
         )
-        target_link_libraries(oakvulkan PRIVATE oakengine)
+        if (WIN32)
+            # Same as oakgl: embed the engine objects on Windows (see above).
+            target_link_libraries(oakvulkan PRIVATE oakengine-obj)
+        else ()
+            target_link_libraries(oakvulkan PRIVATE oakengine)
+        endif ()
         if (COMMAND oak_copy_otio_runtime)
             oak_copy_otio_runtime(oakvulkan)
         endif()