diff --git a/.travis.yml b/.travis.yml
index ae2b8c9..342d338 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,8 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode9.1
 branches:
   only:
     - master
-before_script:
-  - git submodule update --init --recursive
 script: script/cibuild "$TRAVIS_XCODE_WORKSPACE" "$TRAVIS_XCODE_SCHEME" "$XCODE_ACTION"
 xcode_workspace: Tentacle.xcworkspace
 matrix:
@@ -15,7 +13,8 @@ matrix:
       env: XCODE_ACTION="build-for-testing test-without-building"
     - xcode_scheme: update-test-fixtures
       env: XCODE_ACTION=build
-    - before_script: true
+    - git:
+        submodules: false
       script:
         - swift build
         - swift test