diff --git a/History.markdown b/History.markdown
index 81707ad61..6f5f70e1e 100644
--- a/History.markdown
+++ b/History.markdown
@@ -1,4 +1,4 @@
-## HEAD
+## 4.2.0 / 2020-12-14
 
 ### Minor Enhancements
 
diff --git a/docs/_config.yml b/docs/_config.yml
index 260193a55..1c6c11519 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -1,5 +1,5 @@
 ---
-version: 4.1.1
+version: 4.2.0
 name: Jekyll • Simple, blog-aware, static sites
 description: Transform your plain text into static websites and blogs
 url: https://jekyllrb.com
diff --git a/docs/_docs/history.md b/docs/_docs/history.md
index 4a58710d8..a258a9a54 100644
--- a/docs/_docs/history.md
+++ b/docs/_docs/history.md
@@ -4,6 +4,117 @@ permalink: "/docs/history/"
 note: This file is autogenerated. Edit /History.markdown instead.
 ---
 
+## 4.2.0 / 2020-12-14
+{: #v4-2-0}
+
+### Minor Enhancements
+{: #minor-enhancements-v4-2-0}
+
+- Warn on command-line with permalink conflict ([#8342]({{ site.repository }}/issues/8342))
+- Supress warning issued for redirect pages ([#8347]({{ site.repository }}/issues/8347))
+- Enhance detection of conflicting destination URLs ([#8459]({{ site.repository }}/issues/8459))
+- Add `:post_convert` hook to modify HTML content before layout ([#8368]({{ site.repository }}/issues/8368))
+- Allow triggering `:post_convert` events atomically ([#8465]({{ site.repository }}/issues/8465))
+- Debug reading Page and Layout objects ([#8100]({{ site.repository }}/issues/8100))
+- Do not reset `site.url` to `http://localhost:4000` by default ([#7253]({{ site.repository }}/issues/7253))
+- Add custom debug strings for Jekyll objects ([#8473]({{ site.repository }}/issues/8473))
+- Debug reading data files in a site ([#8481]({{ site.repository }}/issues/8481))
+
+### Bug Fixes
+{: #bug-fixes-v4-2-0}
+
+- Replace nested conditional with guard clauses ([#8294]({{ site.repository }}/issues/8294))
+- Fix: security bump ([#8349]({{ site.repository }}/issues/8349))
+- Fix path matching regex in post_url Liquid tag ([#8375]({{ site.repository }}/issues/8375))
+- Enable `Performance/ChainArrayAllocation` cop ([#8404]({{ site.repository }}/issues/8404))
+- Enable Lint/NoReturnInBeginEndBlocks Cop ([#8457]({{ site.repository }}/issues/8457))
+- Generate items from `site.include` list only once ([#8463]({{ site.repository }}/issues/8463))
+- Explicitly return nil after site process phase ([#8472]({{ site.repository }}/issues/8472))
+
+### Optimization Fixes
+{: #optimization-fixes-v4-2-0}
+
+- Implement custom delegators for drop methods ([#8183]({{ site.repository }}/issues/8183))
+- Handle `nil` argument to `Jekyll.sanitized_path` ([#8415]({{ site.repository }}/issues/8415))
+- Cache `Jekyll.sanitized_path` ([#8424]({{ site.repository }}/issues/8424))
+- Memoize array of drop getter method names ([#8421]({{ site.repository }}/issues/8421))
+- Reduce string allocations from the `link` tag ([#8387]({{ site.repository }}/issues/8387))
+- Optimize parsing of parameters in `include` tag ([#8192]({{ site.repository }}/issues/8192))
+- Stash documents `write?` attribute in a variable ([#8389]({{ site.repository }}/issues/8389))
+- Reduce string allocations from generating doc URLs ([#8392]({{ site.repository }}/issues/8392))
+- Check if site is in incremental mode optimally ([#8401]({{ site.repository }}/issues/8401))
+- Utilize flexibility of `Site#in_dest_dir` ([#8403]({{ site.repository }}/issues/8403))
+- Reduce allocations from rendering item as liquid ([#8406]({{ site.repository }}/issues/8406))
+- Compute relative_path of pages using PathManager ([#8408]({{ site.repository }}/issues/8408))
+- Reduce allocation from `normalize_whitespace` filter ([#8400]({{ site.repository }}/issues/8400))
+- Use `Regexp#match?` when `MatchData` is not required ([#8427]({{ site.repository }}/issues/8427))
+- Check default front matter scope against symbols ([#8393]({{ site.repository }}/issues/8393))
+- Stash frequently used `Drop` setter keys for reuse ([#8394]({{ site.repository }}/issues/8394))
+- Memoize defaults computed for Convertibles ([#8451]({{ site.repository }}/issues/8451))
+- Reduce array allocations from merging categories ([#8453]({{ site.repository }}/issues/8453))
+- Memoize destination of pages, documents and staticfiles ([#8458]({{ site.repository }}/issues/8458))
+- Reduce allocations from computing item property ([#8485]({{ site.repository }}/issues/8485))
+- Optimize `Page#dir` with a private method ([#8489]({{ site.repository }}/issues/8489))
+- Stash attribute hash for Liquid computed for pages ([#8497]({{ site.repository }}/issues/8497))
+
+### Development Fixes
+{: #development-fixes-v4-2-0}
+
+- Update cucumber gem to version 4.1 ([#8278]({{ site.repository }}/issues/8278))
+- Move permalink styles data to constant ([#8282]({{ site.repository }}/issues/8282))
+- Update rubocop gem to 0.87.1 ([#8287]({{ site.repository }}/issues/8287))
+- Update RuboCop to-do file ([#8296]({{ site.repository }}/issues/8296))
+- Fix `rake console` generating LoadError ([#8312]({{ site.repository }}/issues/8312))
+- Configure Performance cops ([#8369]({{ site.repository }}/issues/8369))
+- Update rubocop gem to 0.90.0 ([#8313]({{ site.repository }}/issues/8313))
+- Refactor `Jekyll::Utils::Platforms` ([#7236]({{ site.repository }}/issues/7236))
+- Bump RuboCop to v0.91.x ([#8391]({{ site.repository }}/issues/8391))
+- Add workflow to build and profile third-party repo ([#8398]({{ site.repository }}/issues/8398))
+- Bump RuboCop to v0.92.x
+- Update cucumber gem version to 5.1.2 ([#8413]({{ site.repository }}/issues/8413))
+- Fix test suite compatibility with JRuby ([#8418]({{ site.repository }}/issues/8418))
+- chore(deps): bump Rubocop to 0.93.0 ([#8430]({{ site.repository }}/issues/8430))
+- Use Ruby 2.7.1 in GitHub Actions ([#8444]({{ site.repository }}/issues/8444))
+- Test that Liquid expressions are not deeply evaled ([#8292]({{ site.repository }}/issues/8292))
+- Test rendering arbitrary Liquid variables by default ([#7414]({{ site.repository }}/issues/7414))
+- Migrate TravisCI jobs to GitHub Actions ([#8492]({{ site.repository }}/issues/8492))
+
+### Documentation
+
+- Update pointer to special permalink variables for collections ([#8274]({{ site.repository }}/issues/8274))
+- Fix special treatment for 'page 1' in docs of pagination ([#8230]({{ site.repository }}/issues/8230))
+- Add Formcake to forms section ([#8283]({{ site.repository }}/issues/8283))
+- Add a note on the rendering process in the docs ([#8291]({{ site.repository }}/issues/8291))
+- Add refactoring type to PULL_REQUEST_TEMPLATE ([#8297]({{ site.repository }}/issues/8297))
+- Update resources.md ([#7864]({{ site.repository }}/issues/7864))
+- Extra apostrophes in an URL ([#8319]({{ site.repository }}/issues/8319))
+- Clarify target of subordinate clause ([#8320]({{ site.repository }}/issues/8320))
+- Cherry-pick commits from conflicting branch `docs-40`
+- Update documentation on third party site ([#8352]({{ site.repository }}/issues/8352))
+- Update default.md with info requested in [#8314]({{ site.repository }}/issues/8314) ([#8353]({{ site.repository }}/issues/8353))
+- Clarify description of `safe` option ([#8354]({{ site.repository }}/issues/8354))
+- Simplifying the Git post-receive hook-example ([#8358]({{ site.repository }}/issues/8358))
+- Add missing doc for build and serve commands ([#8365]({{ site.repository }}/issues/8365))
+- Docs Review: Getting Started ([#8372]({{ site.repository }}/issues/8372))
+- Add note about rebooting system after installation ([#8359]({{ site.repository }}/issues/8359))
+- Use data file to render table at `/docs/configuration/options/#global-configuration` ([#8377]({{ site.repository }}/issues/8377))
+- Use data file(s) to render table(s) at `/docs/configuration/options/` ([#8380]({{ site.repository }}/issues/8380))
+- Improve maintainability of config option data ([#8383]({{ site.repository }}/issues/8383))
+- Remove CircleCI v1 docs ([#8410]({{ site.repository }}/issues/8410))
+- Remove `NOKOGIRI_USE_SYSTEM_LIBRARIES` from Travis CI docs ([#8409]({{ site.repository }}/issues/8409))
+- Add links to all Jekyll themes on GitHub tagged with #jekyll-theme ([#8447]({{ site.repository }}/issues/8447))
+- Document initializing project Gemfile from scratch ([#8450]({{ site.repository }}/issues/8450))
+- Document installation of additional dependencies for installing Jekyll on Fedora ([#8456]({{ site.repository }}/issues/8456))
+- Improve documentation on Hooks in Jekyll ([#8467]({{ site.repository }}/issues/8467))
+- Build docs site with GitHub Actions ([#8201]({{ site.repository }}/issues/8201))
+- Add link to Assets page from `_sass` section in `_docs/structure.md` ([#8486]({{ site.repository }}/issues/8486))
+
+### Site Enhancements
+{: #site-enhancements-v4-2-0}
+
+- Fix rendering of *showcase* images ([#8504]({{ site.repository }}/issues/8504))
+
+
 ## 4.1.1 / 2020-06-24
 {: #v4-1-1}
 
diff --git a/docs/_posts/2020-12-14-jekyll-4-2-0-released.markdown b/docs/_posts/2020-12-14-jekyll-4-2-0-released.markdown
new file mode 100644
index 000000000..b77ccbf4f
--- /dev/null
+++ b/docs/_posts/2020-12-14-jekyll-4-2-0-released.markdown
@@ -0,0 +1,31 @@
+---
+title: "Jekyll 4.2.0 Released"
+date: 2020-12-14 14:12:20 +0530
+author: ashmaroli
+version: 4.2.0
+category: release
+---
+
+Greetings Jekyllers! Jekyll v4.2.0 is out!
+
+This release gives you a new hook named `:post_convert` that allows modifying rendered HTML contents before they are
+placed into the designated layout(s).
+
+Detecting files that get written into the same destination path has been a part of the diagnostics from `jekyll doctor`
+for quite some time now. However, v4.2 has integrated that feature into the build process itself.
+
+On the topic of log output, the `--verbose` output got a bit more verbose. Instead of just showing *documents* that are
+being read, the output will now also show *pages* and *layouts* that are being read into the site.
+
+Additionally, we have stopped overriding the `site.url` to `http://localhost:4000` in absolute URLs while developing
+via `jekyll serve`.
+
+As always, you can go through [the full list of changes](/docs/history/#v4-2-0) if you are interested in the various
+memory-allocation optimizations made to Jekyll.
+
+Special thanks to our community members who helped improving Jekyll codebase and documentation from v4.1.1:
+Adam Alton, Alex Malaszkiewicz, Alexey Pelykh, Brittany Joiner, bytecode1024, Christopher Brown, Chuck Houpt,
+Corey Megown, Dan Nemenyi, Enrico Tolotto, fauno, Felix Breidenstein, Francesco Bianco, Frank Taillandier,
+Gabriel Staples, iBug, Jacobo Vidal, jaybe@jekyll, jesuslerma, jnozsc, joelkennedy, Joe Marshall, Liam Cooke,
+Lou Rectoret, Malathi, m-naumann, Nicholas Paxford, Nikita Skalkin, Parker Moore, Pratyaksh Gautam, Rachel Cheyfitz,
+SaintMalik, Seeker, Shannon Kularathna, Steven Xu, Takuya N, Thelonius Kort and Toby Glei.
diff --git a/docs/latest_version.txt b/docs/latest_version.txt
index 627a3f43a..6aba2b245 100644
--- a/docs/latest_version.txt
+++ b/docs/latest_version.txt
@@ -1 +1 @@
-4.1.1
+4.2.0
diff --git a/lib/jekyll/version.rb b/lib/jekyll/version.rb
index 0f449d031..1b23b987f 100644
--- a/lib/jekyll/version.rb
+++ b/lib/jekyll/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Jekyll
-  VERSION = "4.1.1"
+  VERSION = "4.2.0"
 end