diff --git a/.travis.yml b/.travis.yml
index e5bb3089b..6d0cef9fb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -146,7 +146,7 @@ jobs:
           - /opt/build-windows/x86_64
     - stage: "macOS, AppImage and Flatpak"
       os: osx
-      osx_image: xcode9.2
+      osx_image: xcode9.3
       env: JOB=build-osx
       cache:
         timeout: 300 # seconds
diff --git a/INSTALL.md b/INSTALL.md
index 706177b59..9b4ef8c1b 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -597,7 +597,7 @@ See [AppArmor] to enable confinement for increased security.
 
 ## OS X
 
-Supported OS X versions: >=10.8. (NOTE: only 10.12 is tested during CI)
+Supported OS X versions: >=10.8. (NOTE: only 10.13 is tested during CI)
 
 Compiling qTox on OS X for development requires 2 tools:
 [Xcode](https://developer.apple.com/xcode/) and [homebrew](https://brew.sh).