diff --git a/README.md b/README.md
index 0ea5d97..bc09a1c 100644
--- a/README.md
+++ b/README.md
@@ -48,54 +48,6 @@ And we have a compaction simulator to experiment with your compaction algorithm
 cargo run --bin compaction-simulator-ref
 ```
 
-## Progress
-
-We are working on a new version of the mini-lsm tutorial that is split into 3 weeks.
-
-* Week 1: Storage Format + Engine Skeleton
-* Week 2: Compaction and Persistence
-* Week 3: Multi-Version Concurrency Control
-* The Extra Week / Rest of Your Life: Optimizations  (unlikely to be available in 2024...)
-
-✅: finished \
-🚧: WIP and will likely be available soon
-
-| Week + Chapter | Topic                                           | Solution | Starter Code | Writeup |
-| -------------- | ----------------------------------------------- | -------- | ------------ | ------- |
-| 1.1            | Memtables                                       | ✅        | ✅            | ✅       |
-| 1.2            | Merge Iterators                                 | ✅        | ✅            | ✅       |
-| 1.3            | Block Format                                    | ✅        | ✅            | ✅       |
-| 1.4            | Table Format                                    | ✅        | ✅            | ✅       |
-| 1.5            | Storage Engine - Read Path                      | ✅        | ✅            | ✅       |
-| 1.6            | Storage Engine - Write Path                     | ✅        | ✅            | ✅       |
-| 1.7            | Bloom Filter and Key Compression                | ✅        | ✅            | ✅       |
-| 2.1            | Compaction Implementation                       | ✅        | ✅            | ✅       |
-| 2.2            | Compaction Strategy - Simple                    | ✅        | ✅            | ✅       |
-| 2.3            | Compaction Strategy - Tiered                    | ✅        | ✅            | ✅       |
-| 2.4            | Compaction Strategy - Leveled                   | ✅        | ✅            | ✅       |
-| 2.5            | Manifest                                        | ✅        | ✅            | ✅       |
-| 2.6            | Write-Ahead Log                                 | ✅        | ✅            | ✅       |
-| 2.7            | Batch Write + Checksum                          |          |              |         |
-| 3.1            | Timestamp Key Encoding + New Block Format       |          |              |         |
-| 3.2            | Prefix Bloom Filter                             |          |              |         |
-| 3.3            | Snapshot Read                                   |          |              |         |
-| 3.4            | Watermark and Garbage Collection                |          |              |         |
-| 3.5            | Transactions and Optimistic Concurrency Control |          |              |         |
-| 3.6            | Serializable Snapshot Isolation                 |          |              |         |
-| 3.7            | TTL (Time-to-Live) Entries                      |          |              |         |
-| 4.1            | Benchmarking                                    |          |              |         |
-| 4.2            | Block Compression                               |          |              |         |
-| 4.3            | Trivial Move and Parallel Compaction            |          |              |         |
-| 4.4            | Alternative Block Encodings                     |          |              |         |
-| 4.5            | Rate Limiter and I/O Optimizations              |          |              |         |
-| 4.6            | Build Your Own Block Cache                      |          |              |         |
-| 4.7            | Build Your Own SkipList                         |          |              |         |
-| 4.8            | Async Engine                                    |          |              |         |
-| 4.9            | Key-Value Separation                            |          |              |         |
-| 4.10           | Column Families                                 |          |              |         |
-| 4.11           | Sharding                                        |          |              |         |
-| 4.12           | SQL over Mini-LSM                               |          |              |         |
-
 ## License
 
 The Mini-LSM starter code and solution are under Apache 2.0 license. The author reserves the full copyright of the tutorial materials (markdown files and figures).
diff --git a/mini-lsm-book/src/week4-overview.md b/mini-lsm-book/src/week4-overview.md
index b230401..e4e4eaf 100644
--- a/mini-lsm-book/src/week4-overview.md
+++ b/mini-lsm-book/src/week4-overview.md
@@ -12,7 +12,8 @@ This is an advanced part that deep dives into optimizations and applications of
 | 4.6            | Build Your Own Block Cache           |          |              |         |
 | 4.7            | Build Your Own SkipList              |          |              |         |
 | 4.8            | Async Engine                         |          |              |         |
-| 4.9            | Key-Value Separation                 |          |              |         |
-| 4.10           | Column Families                      |          |              |         |
-| 4.11           | Sharding                             |          |              |         |
-| 4.12           | SQL over Mini-LSM                    |          |              |         |
+| 4.9            | IO-uring-based I/O engine            |          |              |         |
+| 4.10           | Key-Value Separation                 |          |              |         |
+| 4.11           | Column Families                      |          |              |         |
+| 4.12           | Sharding                             |          |              |         |
+| 4.13           | SQL over Mini-LSM                    |          |              |         |