diff --git a/doc/contributing/source/conf.py b/doc/contributing/source/conf.py
index 20ce22bac..c5be02179 100644
--- a/doc/contributing/source/conf.py
+++ b/doc/contributing/source/conf.py
@@ -48,9 +48,9 @@ copyright = u'2015, ns-3 project'
 # built documents.
 #
 # The short X.Y version.
-version = 'ns-3.39'
+version = 'ns-3-dev'
 # The full version, including alpha/beta/rc tags.
-release = 'ns-3.39'
+release = 'ns-3-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/installation/source/conf.py b/doc/installation/source/conf.py
index 9d56b8a40..9afab90d9 100644
--- a/doc/installation/source/conf.py
+++ b/doc/installation/source/conf.py
@@ -48,9 +48,9 @@ copyright = u'2018, ns-3 project'
 # built documents.
 #
 # The short X.Y version.
-version = 'ns-3.39'
+version = 'ns-3-dev'
 # The full version, including alpha/beta/rc tags.
-release = 'ns-3.39'
+release = 'ns-3-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/manual/source/conf.py b/doc/manual/source/conf.py
index b82319874..46a0f3ba6 100644
--- a/doc/manual/source/conf.py
+++ b/doc/manual/source/conf.py
@@ -73,9 +73,9 @@ copyright = u'2006-2019'
 # built documents.
 #
 # The short X.Y version.
-version = u'ns-3.39'
+version = u'ns-3-dev'
 # The full version, including alpha/beta/rc tags.
-release = u'ns-3.39'
+release = u'ns-3-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/models/source/conf.py b/doc/models/source/conf.py
index 76c3b5145..63294ce75 100644
--- a/doc/models/source/conf.py
+++ b/doc/models/source/conf.py
@@ -73,9 +73,9 @@ copyright = u'2006-2019'
 # built documents.
 #
 # The short X.Y version.
-version = u'ns-3.39'
+version = u'ns-3-dev'
 # The full version, including alpha/beta/rc tags.
-release = u'ns-3.39'
+release = u'ns-3-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/tutorial/source/conf.py b/doc/tutorial/source/conf.py
index 1ebe7befc..129370698 100644
--- a/doc/tutorial/source/conf.py
+++ b/doc/tutorial/source/conf.py
@@ -71,9 +71,9 @@ copyright = u'2006-2019'
 # built documents.
 #
 # The short X.Y version.
-version = u'ns-3.39'
+version = u'ns-3-dev'
 # The full version, including alpha/beta/rc tags.
-release = u'ns-3.39'
+release = u'ns-3-dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.