diff --git a/spec/integration/site/Gemfile b/spec/integration/site/Gemfile
index ee29f33..11a10e5 100644
--- a/spec/integration/site/Gemfile
+++ b/spec/integration/site/Gemfile
@@ -4,6 +4,11 @@ source 'https://rubygems.org'
 
 gem 'jekyll', '~> 3.7.3'
 
+# Note: jekyll-remote-theme download themes on each run, which makes tests
+# really slow. To workaround the issue, I submitted a PR to add a cache duration
+# to the download. It hasn't been merged yet, so we're using the PR fork for now
+# Once https://github.com/benbalter/jekyll-remote-theme/pull/36 is merged, we'll
+# be able to use the official gem
 gem 'jekyll-remote-theme',
     git: 'https://github.com/pixelastic/jekyll-remote-theme',
     branch: 'cache'
diff --git a/spec/integration/site/_config.yml b/spec/integration/site/_config.yml
index 65a71e4..9765e8b 100644
--- a/spec/integration/site/_config.yml
+++ b/spec/integration/site/_config.yml
@@ -2,7 +2,7 @@ collections:
   my-collection:
     output: true
 timezone: Europe/Paris
-remote_theme: "mmistakes/minimal-mistakes"
+remote_theme: "mmistakes/minimal-mistakes@4.13.0"
 remote_theme_cache: 3600
 
 algolia: