version: Update version after 9.0 release.

.github/ISSUE_TEMPLATE/2_bug_report.md

@@ -11,8 +11,8 @@ labels: ["bug"]
 **Zulip Server and web app version:**
 
 - [ ] Zulip Cloud (`*.zulipchat.com`)
-- [ ] Zulip Server 8.0+
-- [ ] Zulip Server 7.0+
-- [ ] Zulip Server 6.0+
-- [ ] Zulip Server 5.0 or older
+- [ ] Zulip Server 9.x
+- [ ] Zulip Server 8.x
+- [ ] Zulip Server 7.x
+- [ ] Zulip Server 6.x or older
 - [ ] Other or not sure

api_docs/changelog.md

@@ -18,6 +18,11 @@ clients should check the `zulip_feature_level` field, present in the
 /register`](/api/register-queue) responses, to determine the API
 format used by the Zulip server that they are interacting with.
 
+## Changes in Zulip 10.0
+
+Feature levels 278-279 are reserved for future use in 9.x maintenance
+releases.
+
 ## Changes in Zulip 9.0
 
 **Feature level 277**

docs/overview/changelog.md

@@ -1,9 +1,21 @@
 # Version history
 
-This page contains the release history for the Zulip Server 9.x stable
-release series. See the [current Zulip changelog][latest-changelog]
-for newer release series, or the [commit log][commit-log] for an
-up-to-date list of all changes.
+This page contains the release history for the Zulip server. See also the
+[Zulip release lifecycle](../overview/release-lifecycle.md).
+
+## Zulip Server 10.x series (development)
+
+This section is an incomplete draft of the release notes for the next
+major release, and is only updated occasionally. See the [commit
+log][commit-log] for an up-to-date list of all changes.
+
+### Zulip Server 10.0
+
+_Unreleased_
+
+#### Upgrade notes for 10.0
+
+- None yet.
 
 ## Zulip Server 9.x series
 
@@ -4110,6 +4122,7 @@ _Released 2015-10-19_
 This section links to the upgrade notes from past releases, so you can
 easily read them all when upgrading across multiple releases.
 
+- [Draft upgrade notes for 10.0](#upgrade-notes-for-100)
 - [Upgrade notes for 9.0](#upgrade-notes-for-90)
 - [Upgrade notes for 8.0](#upgrade-notes-for-80)
 - [Upgrade notes for 7.0](#upgrade-notes-for-70)

docs/subsystems/release-checklist.md

@@ -103,8 +103,8 @@ preparing a new release.
     to both zulip.git and zulip-internal.git to get a correct version
     number for future Cloud deployments.
   - Add the new release to `.github/ISSUE_TEMPLATE/2_bug_report.md`.
-  - Consider removing a few old releases from ReadTheDocs; we keep about
-    two years of back-versions.
+  - Consider removing a few old releases from the issue template and
+    ReadTheDocs; we keep about two years of back-versions.
   - Update Transifex to add the new `4.x` style release branch
     resources and archive the previous release branch's resources with
     the "Translations can't translate this resource" setting.

version.py

@@ -1,6 +1,6 @@
 import os
 
-ZULIP_VERSION = "9.0"
+ZULIP_VERSION = "10.0-dev+git"
 
 # Add information on number of commits and commit hash to version, if available
 zulip_git_version_file = os.path.join(