diff --git a/.travis.yml b/.travis.yml
index 71c8ceff43..10713bf2e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,6 @@ mono: none
 os:
   - linux
   - osx
-osx_image: xcode7.3
 branches:
   only:
     - master
diff --git a/appveyor.yml b/appveyor.yml
index 4af9de6b8a..1041615c68 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -11,4 +11,4 @@ build_script:
 clone_depth: 1
 test: off
 deploy: off
-os: Visual Studio 2015
+os: Visual Studio 2017