diff --git a/CMakeModules/Version.cmake b/CMakeModules/Version.cmake
index 6b5d59d..4810494 100644
--- a/CMakeModules/Version.cmake
+++ b/CMakeModules/Version.cmake
@@ -20,4 +20,4 @@ set(LIBWEBRTC_API_VERSION
 set(LIBWEBRTC_VERSION
     ${LIBWEBRTC_API_VERSION}${LIBWEBRTC_BUILD_VERSION})
 
-set(LIBWEBRTC_WEBRTC_HEAD refs/branch-heads/58)
+set(LIBWEBRTC_WEBRTC_HEAD refs/branch-heads/66)
diff --git a/appveyor.yml b/appveyor.yml
index d490d29..7d27088 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -8,6 +8,7 @@ platform:
 
 configuration:
   - Release
+  - Debug
 
 clone_folder: c:\projects\libwebrtc
 
@@ -15,7 +16,7 @@ before_build:
   - cd c:\projects\libwebrtc
   - if "%platform%"=="x86" set CMAKE_GENERATOR_NAME=Visual Studio 14 2015
   - if "%platform%"=="x64" set CMAKE_GENERATOR_NAME=Visual Studio 14 2015 Win64
-  - cmake -G "%CMAKE_GENERATOR_NAME%" -DCMAKE_BUILD_TYPE=%configuration% -DWEBRTC_BRANCH_HEAD=refs/branch-heads/63 -DBUILD_TESTS=ON -DCMAKE_INSTALL_PREFIX=c:\projects\libwebrtc .
+  - cmake -G "%CMAKE_GENERATOR_NAME%" -DCMAKE_BUILD_TYPE=%configuration% -DWEBRTC_BRANCH_HEAD=refs/branch-heads/66 -DBUILD_TESTS=ON -DCMAKE_INSTALL_PREFIX=c:\projects\libwebrtc .
 
 build:
   project: PACKAGE.vcxproj