diff --git a/VERSION b/VERSION
index 1b8ef0972..a2b1f5109 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3-dev
+3.40
diff --git a/doc/contributing/source/conf.py b/doc/contributing/source/conf.py
index c5be02179..d468812fb 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-dev'
+version = 'ns-3.40'
 # The full version, including alpha/beta/rc tags.
-release = 'ns-3-dev'
+release = 'ns-3.40'
 
 # 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 9afab90d9..5627815cf 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-dev'
+version = 'ns-3.40'
 # The full version, including alpha/beta/rc tags.
-release = 'ns-3-dev'
+release = 'ns-3.40'
 
 # 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 46a0f3ba6..c3cfee573 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-dev'
+version = u'ns-3.40'
 # The full version, including alpha/beta/rc tags.
-release = u'ns-3-dev'
+release = u'ns-3.40'
 
 # 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 63294ce75..642cc2eeb 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-dev'
+version = u'ns-3.40'
 # The full version, including alpha/beta/rc tags.
-release = u'ns-3-dev'
+release = u'ns-3.40'
 
 # 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 129370698..a93ff993f 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-dev'
+version = u'ns-3.40'
 # The full version, including alpha/beta/rc tags.
-release = u'ns-3-dev'
+release = u'ns-3.40'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.