diff --git a/acme/setup.py b/acme/setup.py
index b92a83eca..839c3f284 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -3,7 +3,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'cryptography>=2.1.4',
diff --git a/certbot-apache/setup.py b/certbot-apache/setup.py
index 5e1969a0f..918b2281c 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 = '1.20.0'
+version = '1.21.0.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 e29adc0c5..ac1aa659e 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'certbot',
diff --git a/certbot-dns-cloudflare/setup.py b/certbot-dns-cloudflare/setup.py
index c26b4eb2c..1f3a13e73 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'cloudflare>=1.5.1',
diff --git a/certbot-dns-cloudxns/setup.py b/certbot-dns-cloudxns/setup.py
index ccc8ac374..426fb9d92 100644
--- a/certbot-dns-cloudxns/setup.py
+++ b/certbot-dns-cloudxns/setup.py
@@ -4,7 +4,7 @@ import sys
 from setuptools import find_packages
 from setuptools import setup
 
-version = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-digitalocean/setup.py b/certbot-dns-digitalocean/setup.py
index 2f280df13..36b129732 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 = '1.20.0'
+version = '1.21.0.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 2de2733c4..382e5537b 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 = '1.20.0'
+version = '1.21.0.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 7d6c0ee03..1d5acff5f 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-gehirn/setup.py b/certbot-dns-gehirn/setup.py
index 6c3836522..b4a72359a 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-google/setup.py b/certbot-dns-google/setup.py
index 03f14f91c..04c2913ef 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'google-api-python-client>=1.5.5',
diff --git a/certbot-dns-linode/setup.py b/certbot-dns-linode/setup.py
index 05bc8ebf7..12c708afd 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-luadns/setup.py b/certbot-dns-luadns/setup.py
index aa63a78b2..276bb0d9e 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-nsone/setup.py b/certbot-dns-nsone/setup.py
index 3aaef08a1..04c05ecd2 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-ovh/setup.py b/certbot-dns-ovh/setup.py
index 3aaa4f1b0..9a80b31c4 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-dns-rfc2136/setup.py b/certbot-dns-rfc2136/setup.py
index a6a6e1fef..ef7b134a3 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dnspython>=1.15.0',
diff --git a/certbot-dns-route53/setup.py b/certbot-dns-route53/setup.py
index e5ec4271a..36c954d26 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'boto3',
diff --git a/certbot-dns-sakuracloud/setup.py b/certbot-dns-sakuracloud/setup.py
index df61cecbd..12825ee4c 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     'dns-lexicon>=3.2.1',
diff --git a/certbot-nginx/setup.py b/certbot-nginx/setup.py
index 73c478b61..f56955044 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 = '1.20.0'
+version = '1.21.0.dev0'
 
 install_requires = [
     # We specify the minimum acme and certbot version as the current plugin
diff --git a/certbot/certbot/__init__.py b/certbot/certbot/__init__.py
index 80f1b22df..229bbd314 100644
--- a/certbot/certbot/__init__.py
+++ b/certbot/certbot/__init__.py
@@ -1,3 +1,3 @@
 """Certbot client."""
 # version number like 1.2.3a0, must have at least 2 parts, like 1.2
-__version__ = '1.20.0'
+__version__ = '1.21.0.dev0'