diff --git a/.travis.yml b/.travis.yml
index a24efe7..1e325f9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -297,7 +297,9 @@ install:
   - git submodule init libs/detail
   - git submodule init libs/integer
   - git submodule init tools/build
-  - git submodule update
+  - git submodule init libs/headers
+  - git submodule init tools/boost_install
+  - git submodule update --jobs 3
   - cp -r $TRAVIS_BUILD_DIR/* libs/smart_ptr
   - ./bootstrap.sh
   - ./b2 headers
diff --git a/appveyor.yml b/appveyor.yml
index 9face39..ed98ba8 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -60,8 +60,10 @@ install:
   - git submodule init libs/detail
   - git submodule init libs/integer
   - git submodule init tools/build
-  - git submodule update
-  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\smart_ptr
+  - git submodule init libs/headers
+  - git submodule init tools/boost_install
+  - git submodule update --jobs 3
+  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\smart_ptr\
   - cmd /c bootstrap
   - b2 -d0 headers