diff --git a/Dockerfile b/Dockerfile
index 8ee8a9a..4ce7a6f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -55,7 +55,8 @@ RUN useradd rails --create-home --shell /bin/bash && \
     chown -R rails:rails db log storage tmp
 USER rails:rails
 
-ENV LD_PRELOAD=libjemalloc.so.2
+ENV LD_PRELOAD=libjemalloc.so.2 \
+    RUBY_YJIT_ENABLE="1"
 
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]