diff --git a/README.md b/README.md
index 92ba6867..e2dc4e34 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 rCore-Tutorial version 3.5. See the [Documentation in Chinese](https://rcore-os.github.io/rCore-Tutorial-Book-v3/).
 
 ## news
-- 2021.07.29: Now we are updating our labs. Please checkout chX-dev Branches for our current new labs. (Notice: please see the [Dependency] section in the end of this doc)
+- 2021.11.20: Now we are updating our labs. Please checkout chX-dev Branches for our current new labs. (Notice: please see the [Dependency] section in the end of this doc)
 
 ## Overview
 
@@ -41,16 +41,17 @@ Overall progress: ch7
 * [x] expand the fs image size generated by `rcore-fs-fuse` to 128MiB
 * [x] add a new test named `huge_write` which evaluates the fs performance(qemu\~500KiB/s k210\~50KiB/s)
 * [x] flush all block cache to disk after a fs transaction which involves write operation
+* [x] replace `spin::Mutex` with `UPSafeCell` before SMP chapter
+* [x] add codes for a new chapter about synchronization & mutual exclusion(uniprocessor only)
 
 ### Todo(High priority)
 
+* [ ] support Allwinner's RISC-V D1 chip
 * [ ] bug fix: we should call `find_pte` rather than `find_pte_create` in `PageTable::unmap`
 * [ ] bug fix: check validity of level-3 pte in `find_pte` instead of checking it outside this function
 * [ ] use old fs image optionally, do not always rebuild the image
-* [ ] replace `spin::Mutex` with `UPSafeCell` before SMP chapter
 * [ ] add new system calls: getdents64/fstat
 * [ ] shell functionality improvement(to be continued...)
-* [ ] add a new chapter about synchronization & mutual exclusion(uniprocessor only)
 * [ ] give every non-zero process exit code an unique and clear error type
 * [ ] effective error handling of mm module
 
@@ -59,17 +60,7 @@ Overall progress: ch7
 * [ ] rewrite practice doc and remove some inproper questions
 * [ ] provide smooth debug experience at a Rust source code level
 * [ ] format the code using official tools
-* [ ] support Allwinner's RISC-V D1 chip
-
-## Dependency
-
-### Binaries
-
-* rustc 1.56.0-nightly (b03ccace5 2021-08-24)
-
-* qemu: 5.0.0
 
-* rustsbi: qemu[7d71bfb7] k210[563144b0]
 
 ### Crates
 
diff --git a/dev-env-info.md b/dev-env-info.md
index e97de711..f76470a5 100644
--- a/dev-env-info.md
+++ b/dev-env-info.md
@@ -5,7 +5,9 @@ rCore-Tutorial version 3.x
 
 ### Binaries
 
-* rustc 1.56.0-nightly (08095fc1f 2021-07-26)
+* rustc: 1.57.0-nightly (e1e9319d9 2021-10-14)
+
+* cargo-binutils: 0.3.3
 
 * qemu: 5.0.0