The Apollo Client team has released version 3.9, which includes several memory-related improvements and changes. The update addresses various memory leaks and adds granular control over internal cache sizes to improve performance and reduce memory usage. A new Weak LRU Cache implementation replaces weak maps for memoized results, and the canonizeResults option is deprecated due to a conceptual memory leak issue. Users can now configure individual cache sizes for better trade-offs in their applications. The team also fixed several other potential memory leaks and improved the behavior of various Apollo Client components. To help refine the default cache sizes, users are encouraged to run the beta version of Apollo Client 3.9 in their applications and submit feedback on the results.