diff --git a/lib/tasks/docker.rake b/lib/tasks/docker.rake
index 0038bfe62a1..22a80e833cc 100644
--- a/lib/tasks/docker.rake
+++ b/lib/tasks/docker.rake
@@ -201,6 +201,7 @@ task 'docker:test' do
 
       unless ENV["RUBY_ONLY"]
         js_timeout = ENV["JS_TIMEOUT"].presence || 900_000 # 15 minutes
+        @good &&= run_or_fail 'yarn install'
 
         unless ENV["SKIP_CORE"]
           @good &&= run_or_fail("cd app/assets/javascripts/discourse && CI=1 yarn ember exam --random")