diff --git a/config/deploy.yml b/config/deploy.yml
index eec39c97..8d0396e2 100644
--- a/config/deploy.yml
+++ b/config/deploy.yml
@@ -20,6 +20,8 @@ registry:
 
 # Inject ENV variables into containers (secrets come from .env).
 env:
+  clear:
+    RUBY_YJIT_ENABLE: 1
   secret:
     - RAILS_MASTER_KEY
     - APPSIGNAL_PUSH_API_KEY