diff --git a/.travis.yml b/.travis.yml
index e01af30..f3c7556 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -260,7 +260,7 @@ install:
   - git submodule init tools/build
   - git submodule init tools/boost_install
   - git submodule init libs/headers
-  - git submodule update
+  - git submodule update --jobs 4
   - cp -r $TRAVIS_BUILD_DIR/* libs/sync
   - python tools/boostdep/depinst/depinst.py sync
   - ./bootstrap.sh
diff --git a/appveyor.yml b/appveyor.yml
index 6ef2bae..9326338 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -90,7 +90,7 @@ install:
   - git submodule init tools/build
   - git submodule init tools/boost_install
   - git submodule init libs/headers
-  - git submodule update
+  - git submodule update --jobs 4
   - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\sync
   - python tools/boostdep/depinst/depinst.py sync
   - cmd /c bootstrap