Maybe this will fix builds

- also increment Bootstrap version
- require latest bower

.gitlab-ci.yml

@@ -4,8 +4,6 @@ build_css:
     before_script:
         - npm install
         - npm install -g grunt-cli
-        - npm install -g bower
-        - bower install -allow-root
         - apt install ruby
         - gem install sass
     script:

Gruntfile.js

@@ -17,7 +17,7 @@ module.exports = function (grunt) {
             ' * Homepage: <%= pkg.homepage %>\n' +
             ' * Copyright <%= grunt.template.today("yyyy") %> <%= pkg.author %>\n' +
             ' * Licensed under <%= pkg.license %>\n' +
-            ' * Based on Bootstrap\n' +
+            ' * Based on Bootstrap 4\n' +
             '*/\n',
     swatch: { masonstrap:{} },
     clean: {

package.json

@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "autoprefixer": "^6.5.0",
-    "bower": "~1.2.8",
+    "bower": "^1.2.8",
     "grunt": "^1.0.1",
     "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-concat": "^1.0.1",