diff --git a/acme/setup.py b/acme/setup.py
index b45f7e8cf..053b082ff 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 setup(
     version=version,
diff --git a/certbot-apache/setup.py b/certbot-apache/setup.py
index c1d3feebd..b33218bc9 100644
--- a/certbot-apache/setup.py
+++ b/certbot-apache/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     # We specify the minimum certbot version as the current plugin
diff --git a/certbot-ci/setup.py b/certbot-ci/setup.py
index b45f7e8cf..053b082ff 100644
--- a/certbot-ci/setup.py
+++ b/certbot-ci/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 setup(
     version=version,
diff --git a/certbot-compatibility-test/setup.py b/certbot-compatibility-test/setup.py
index b45f7e8cf..053b082ff 100644
--- a/certbot-compatibility-test/setup.py
+++ b/certbot-compatibility-test/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 setup(
     version=version,
diff --git a/certbot-dns-cloudflare/setup.py b/certbot-dns-cloudflare/setup.py
index d206cb33e..2f3516357 100644
--- a/certbot-dns-cloudflare/setup.py
+++ b/certbot-dns-cloudflare/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.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 54fd61e4d..12ba99ade 100644
--- a/certbot-dns-digitalocean/setup.py
+++ b/certbot-dns-digitalocean/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'python-digitalocean>=1.15.0', # 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 d01be8e43..470013340 100644
--- a/certbot-dns-dnsimple/setup.py
+++ b/certbot-dns-dnsimple/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.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 afcb147d9..091901356 100644
--- a/certbot-dns-dnsmadeeasy/setup.py
+++ b/certbot-dns-dnsmadeeasy/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-gehirn/setup.py b/certbot-dns-gehirn/setup.py
index afcb147d9..091901356 100644
--- a/certbot-dns-gehirn/setup.py
+++ b/certbot-dns-gehirn/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-google/setup.py b/certbot-dns-google/setup.py
index d39de1951..a789269e7 100644
--- a/certbot-dns-google/setup.py
+++ b/certbot-dns-google/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.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 afcb147d9..091901356 100644
--- a/certbot-dns-linode/setup.py
+++ b/certbot-dns-linode/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-luadns/setup.py b/certbot-dns-luadns/setup.py
index afcb147d9..091901356 100644
--- a/certbot-dns-luadns/setup.py
+++ b/certbot-dns-luadns/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-nsone/setup.py b/certbot-dns-nsone/setup.py
index afcb147d9..091901356 100644
--- a/certbot-dns-nsone/setup.py
+++ b/certbot-dns-nsone/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-dns-ovh/setup.py b/certbot-dns-ovh/setup.py
index a6234f114..f5f5cf3dc 100644
--- a/certbot-dns-ovh/setup.py
+++ b/certbot-dns-ovh/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.15.1',
diff --git a/certbot-dns-rfc2136/setup.py b/certbot-dns-rfc2136/setup.py
index 0d6ad179b..bbc417b7a 100644
--- a/certbot-dns-rfc2136/setup.py
+++ b/certbot-dns-rfc2136/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.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 8e8e4d7b2..1fec3716d 100644
--- a/certbot-dns-route53/setup.py
+++ b/certbot-dns-route53/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'boto3>=1.20.34',
diff --git a/certbot-dns-sakuracloud/setup.py b/certbot-dns-sakuracloud/setup.py
index afcb147d9..091901356 100644
--- a/certbot-dns-sakuracloud/setup.py
+++ b/certbot-dns-sakuracloud/setup.py
@@ -2,7 +2,7 @@ import os
 
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.14.1',
diff --git a/certbot-nginx/setup.py b/certbot-nginx/setup.py
index 256078684..bf96e9944 100644
--- a/certbot-nginx/setup.py
+++ b/certbot-nginx/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 install_requires = [
     # We specify the minimum certbot version as the current plugin
diff --git a/certbot/src/certbot/__init__.py b/certbot/src/certbot/__init__.py
index b0dc112ae..eb168026c 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__ = '5.5.0'
+__version__ = '5.6.0.dev0'
diff --git a/letstest/setup.py b/letstest/setup.py
index b45f7e8cf..053b082ff 100644
--- a/letstest/setup.py
+++ b/letstest/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '5.5.0'
+version = '5.6.0.dev0'
 
 setup(
     version=version,