diff --git a/.travis.yml b/.travis.yml
index 3b499e8..97b425b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ version: ~> 1.0
 
 # https://docs.travis-ci.com/user/reference/osx/#macos-version
 os: osx
-osx_image: xcode11.3        # macOS 10.14
+osx_image: xcode11.5        # macOS 10.15.4
 
 env:
   global:
diff --git a/Jenkinsfile b/Jenkinsfile
index 4ac8be5..2e747d3 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -30,7 +30,7 @@ pipeline {
         LANG        = 'en_US.UTF-8'
         LANGUAGE    = 'en_US.UTF-8'
         LC_ALL      = 'en_US.UTF-8'
-        DEVELOPER_DIR = '/Applications/Xcode-11.4.1.app'
+        DEVELOPER_DIR = '/Applications/Xcode-11.5.app'
     }
 
     stages {