diff --git a/.travis.yml b/.travis.yml
index 8dfa76b..f1ae484 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -75,7 +75,7 @@ install:
   - git submodule init tools/boostdep
   - 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/iterator
   - python tools/boostdep/depinst/depinst.py iterator
   - ./bootstrap.sh
diff --git a/appveyor.yml b/appveyor.yml
index 43e906c..498099c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,7 +32,7 @@ install:
   - git submodule init tools/boostdep
   - 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\iterator
   - python tools/boostdep/depinst/depinst.py iterator
   - cmd /c bootstrap