Release 5.0.0-pre.20210907.1 (2021-09-14)

Baseline: 9cb59369a84d9328c2929eefcb58c1b972ab15f2

Important changes:

  - The `--toolchain_resolution_debug` flag now accepts regexes
    matching targets, as well as toolchain types, when choosing what
    debug messages to print.

This release contains contributions from many people at Google, as well as Benjamin Peterson, frazze-jobb, Tetsuo Kiso.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18f8703..80d88f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,35 @@
+## Release 5.0.0-pre.20210907.1 (2021-09-14)
+
+```
+Baseline: 9cb59369a84d9328c2929eefcb58c1b972ab15f2
+```
+
+Important changes:
+
+  - The `--toolchain_resolution_debug` flag now accepts regexes
+    matching targets, as well as toolchain types, when choosing what
+    debug messages to print.
+
+This release contains contributions from many people at Google, as well as Benjamin Peterson, frazze-jobb, Tetsuo Kiso.
+
+## Release 5.0.0-pre.20210831.2 (2021-09-10)
+
+```
+Baseline: 14fe5dff967cf91f130746f646d1bb1cfc1053f2
+
+Cherry picks:
+
+   + 6f5c4bb4d17abd6b9654f255c12775eb35638000:
+     Automated rollback of commit
+     8181f0abe6591bc14957e6a941a6556fb040ca9f.
+```
+
+Important changes:
+
+  - The --all_incompatible_changes flag is now a no-op
+
+This release contains contributions from many people at Google, as well as Keith Smiley, kekxv, ron-stripe, Sergey Tyurin.
+
 ## Release 5.0.0-pre.20210826.1 (2021-09-03)
 
 ```