diff --git a/acme/setup.py b/acme/setup.py
index c3117c612..f4e143421 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'cryptography>=43.0.0',
diff --git a/certbot-apache/setup.py b/certbot-apache/setup.py
index 6ffce4f3f..41a34e919 100644
--- a/certbot-apache/setup.py
+++ b/certbot-apache/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     # We specify the minimum acme and certbot version as the current plugin
diff --git a/certbot-compatibility-test/setup.py b/certbot-compatibility-test/setup.py
index 81f600353..a20fb114b 100644
--- a/certbot-compatibility-test/setup.py
+++ b/certbot-compatibility-test/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'certbot',
diff --git a/certbot-dns-cloudflare/setup.py b/certbot-dns-cloudflare/setup.py
index 69b06554b..212c51b80 100644
--- a/certbot-dns-cloudflare/setup.py
+++ b/certbot-dns-cloudflare/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     # for now, do not upgrade to cloudflare>=2.20 to avoid deprecation warnings and the breaking
diff --git a/certbot-dns-digitalocean/setup.py b/certbot-dns-digitalocean/setup.py
index a1ede89ff..72f0d0ce1 100644
--- a/certbot-dns-digitalocean/setup.py
+++ b/certbot-dns-digitalocean/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'python-digitalocean>=1.11', # 1.15.0 or newer is recommended for TTL support
diff --git a/certbot-dns-dnsimple/setup.py b/certbot-dns-dnsimple/setup.py
index 2c12a6a65..3d3ffa6c2 100644
--- a/certbot-dns-dnsimple/setup.py
+++ b/certbot-dns-dnsimple/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     # This version of lexicon is required to address the problem described in
diff --git a/certbot-dns-dnsmadeeasy/setup.py b/certbot-dns-dnsmadeeasy/setup.py
index ebc27a5ef..729363dab 100644
--- a/certbot-dns-dnsmadeeasy/setup.py
+++ b/certbot-dns-dnsmadeeasy/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-gehirn/setup.py b/certbot-dns-gehirn/setup.py
index 0a699f91e..282930095 100644
--- a/certbot-dns-gehirn/setup.py
+++ b/certbot-dns-gehirn/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-google/setup.py b/certbot-dns-google/setup.py
index f98cc0328..5bd42285f 100644
--- a/certbot-dns-google/setup.py
+++ b/certbot-dns-google/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'google-api-python-client>=1.6.5',
diff --git a/certbot-dns-linode/setup.py b/certbot-dns-linode/setup.py
index 9ab0b5098..44f839fdc 100644
--- a/certbot-dns-linode/setup.py
+++ b/certbot-dns-linode/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-luadns/setup.py b/certbot-dns-luadns/setup.py
index b2acf6128..a22cef376 100644
--- a/certbot-dns-luadns/setup.py
+++ b/certbot-dns-luadns/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-nsone/setup.py b/certbot-dns-nsone/setup.py
index 73d9f2f82..3d19c3d32 100644
--- a/certbot-dns-nsone/setup.py
+++ b/certbot-dns-nsone/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-ovh/setup.py b/certbot-dns-ovh/setup.py
index fab380bb1..4218a4d53 100644
--- a/certbot-dns-ovh/setup.py
+++ b/certbot-dns-ovh/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.15.1',
diff --git a/certbot-dns-rfc2136/setup.py b/certbot-dns-rfc2136/setup.py
index 465a06725..33266ff0f 100644
--- a/certbot-dns-rfc2136/setup.py
+++ b/certbot-dns-rfc2136/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     # This version was chosen because it is the version packaged in RHEL 9 and Debian unstable. It
diff --git a/certbot-dns-route53/setup.py b/certbot-dns-route53/setup.py
index 2f0d8b46d..ca2990659 100644
--- a/certbot-dns-route53/setup.py
+++ b/certbot-dns-route53/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'boto3>=1.15.15',
diff --git a/certbot-dns-sakuracloud/setup.py b/certbot-dns-sakuracloud/setup.py
index 042b80c44..9eeccf5bc 100644
--- a/certbot-dns-sakuracloud/setup.py
+++ b/certbot-dns-sakuracloud/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-nginx/setup.py b/certbot-nginx/setup.py
index baaaf7164..91de73b9a 100644
--- a/certbot-nginx/setup.py
+++ b/certbot-nginx/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '5.0.0.dev0'
+version = '4.2.0.dev0'
 
 install_requires = [
     # We specify the minimum acme and certbot version as the current plugin
diff --git a/certbot/CHANGELOG.md b/certbot/CHANGELOG.md
index 37b357d24..fdfabf1c2 100644
--- a/certbot/CHANGELOG.md
+++ b/certbot/CHANGELOG.md
@@ -2,11 +2,11 @@
 
 Certbot adheres to [Semantic Versioning](https://semver.org/).
 
-## 5.0.0 - main
+## 4.2.0 - main
 
 ### Added
 
-*
+* Added `--eab-hmac-alg` parameter to support custom HMAC algorithm for External Account Binding.
 
 ### Changed
 
@@ -25,12 +25,6 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 
 More details about these changes can be found on our GitHub repo.
 
-## 4.2.0
-
-### Added
-
-* Added `--eab-hmac-alg` parameter to support custom HMAC algorithm for External Account Binding.
-
 ## 4.1.1 - 2025-06-12
 
 ### Fixed
diff --git a/certbot/src/certbot/__init__.py b/certbot/src/certbot/__init__.py
index 1247fcd3d..19465f97c 100644
--- a/certbot/src/certbot/__init__.py
+++ b/certbot/src/certbot/__init__.py
@@ -1,4 +1,4 @@
 """Certbot client."""
 
 # version number like 1.2.3a0, must have at least 2 parts, like 1.2
-__version__ = '5.0.0.dev0'
+__version__ = '4.2.0.dev0'