diff --git a/perceval/backends/core/askbot.py b/perceval/backends/core/askbot.py
index dc2d5706c..e62a37f21 100644
--- a/perceval/backends/core/askbot.py
+++ b/perceval/backends/core/askbot.py
@@ -58,7 +58,7 @@ class Askbot(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.8.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_QUESTION]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/bugzilla.py b/perceval/backends/core/bugzilla.py
index 30bdd645c..66fec1393 100644
--- a/perceval/backends/core/bugzilla.py
+++ b/perceval/backends/core/bugzilla.py
@@ -64,7 +64,7 @@ class Bugzilla(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.12.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_BUG]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/bugzillarest.py b/perceval/backends/core/bugzillarest.py
index 69b726fd0..18e9da0c5 100644
--- a/perceval/backends/core/bugzillarest.py
+++ b/perceval/backends/core/bugzillarest.py
@@ -65,7 +65,7 @@ class BugzillaREST(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.12.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_BUG]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/confluence.py b/perceval/backends/core/confluence.py
index 0ef15402e..6e7c45bf6 100644
--- a/perceval/backends/core/confluence.py
+++ b/perceval/backends/core/confluence.py
@@ -68,7 +68,7 @@ class Confluence(Backend):
                  optional for Confluence Data Center and server editions 7.9 and later
     :param api_token: Confluence user's personal access token or api token
     """
-    version = '0.15.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_HISTORICAL_CONTENT]
 
diff --git a/perceval/backends/core/discourse.py b/perceval/backends/core/discourse.py
index 95fcf7fe1..c27677130 100644
--- a/perceval/backends/core/discourse.py
+++ b/perceval/backends/core/discourse.py
@@ -65,7 +65,7 @@ class Discourse(Backend):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.13.1'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_TOPIC]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/dockerhub.py b/perceval/backends/core/dockerhub.py
index 48afd823b..e444959ac 100644
--- a/perceval/backends/core/dockerhub.py
+++ b/perceval/backends/core/dockerhub.py
@@ -61,7 +61,7 @@ class DockerHub(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.6.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_DOCKERHUB_DATA]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/gerrit.py b/perceval/backends/core/gerrit.py
index 400ebdd3a..9d90ad82a 100644
--- a/perceval/backends/core/gerrit.py
+++ b/perceval/backends/core/gerrit.py
@@ -64,7 +64,7 @@ class Gerrit(Backend):
     :param blacklist_ids: exclude the reviews while fetching
     :param id_filepath: path to SSH private key
     """
-    version = '0.13.1'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_REVIEW]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/git.py b/perceval/backends/core/git.py
index 624a38240..71b379328 100644
--- a/perceval/backends/core/git.py
+++ b/perceval/backends/core/git.py
@@ -71,7 +71,7 @@ class Git(Backend):
     :raises RepositoryError: raised when there was an error cloning or
         updating the repository.
     """
-    version = '0.13.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_COMMIT]
 
diff --git a/perceval/backends/core/github.py b/perceval/backends/core/github.py
index 81dfb4bc8..ab7ede54b 100644
--- a/perceval/backends/core/github.py
+++ b/perceval/backends/core/github.py
@@ -111,7 +111,7 @@ class GitHub(Backend):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.27.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ISSUE, CATEGORY_PULL_REQUEST, CATEGORY_REPO]
 
diff --git a/perceval/backends/core/githubql.py b/perceval/backends/core/githubql.py
index 79d71588c..eaf768fa1 100644
--- a/perceval/backends/core/githubql.py
+++ b/perceval/backends/core/githubql.py
@@ -307,7 +307,7 @@ class GitHubQL(GitHub):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.4.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_EVENT]
 
diff --git a/perceval/backends/core/gitlab.py b/perceval/backends/core/gitlab.py
index f6b673c18..9abe88c7e 100644
--- a/perceval/backends/core/gitlab.py
+++ b/perceval/backends/core/gitlab.py
@@ -91,7 +91,7 @@ class GitLab(Backend):
         the ones (413, 429, 503) defined in the HttpClient class
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.12.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ISSUE, CATEGORY_MERGE_REQUEST]
     ORIGIN_UNIQUE_FIELD = OriginUniqueField(name='iid', type=int)
diff --git a/perceval/backends/core/gitter.py b/perceval/backends/core/gitter.py
index 642801b6a..279a5ba1f 100644
--- a/perceval/backends/core/gitter.py
+++ b/perceval/backends/core/gitter.py
@@ -62,7 +62,7 @@ class Gitter(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.1.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
 
diff --git a/perceval/backends/core/googlehits.py b/perceval/backends/core/googlehits.py
index c212314ce..878b2180c 100644
--- a/perceval/backends/core/googlehits.py
+++ b/perceval/backends/core/googlehits.py
@@ -60,7 +60,7 @@ class GoogleHits(Backend):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.4.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_HITS]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/groupsio.py b/perceval/backends/core/groupsio.py
index ff370926a..7c5141dec 100644
--- a/perceval/backends/core/groupsio.py
+++ b/perceval/backends/core/groupsio.py
@@ -68,7 +68,7 @@ class Groupsio(MBox):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.4.2'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
 
diff --git a/perceval/backends/core/hyperkitty.py b/perceval/backends/core/hyperkitty.py
index 723ebf66b..1f3292db0 100644
--- a/perceval/backends/core/hyperkitty.py
+++ b/perceval/backends/core/hyperkitty.py
@@ -58,7 +58,7 @@ class HyperKitty(MBox):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.7.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
 
diff --git a/perceval/backends/core/jenkins.py b/perceval/backends/core/jenkins.py
index 415c123c2..d51920127 100644
--- a/perceval/backends/core/jenkins.py
+++ b/perceval/backends/core/jenkins.py
@@ -64,7 +64,7 @@ class Jenkins(Backend):
     :param blacklist_ids: exclude the jobs ID of this list while fetching
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.16.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_BUILD]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/jira.py b/perceval/backends/core/jira.py
index 105a06d31..4c40b4bb3 100644
--- a/perceval/backends/core/jira.py
+++ b/perceval/backends/core/jira.py
@@ -106,7 +106,7 @@ class Jira(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.15.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ISSUE]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/launchpad.py b/perceval/backends/core/launchpad.py
index 9e008b55a..87bb40b76 100644
--- a/perceval/backends/core/launchpad.py
+++ b/perceval/backends/core/launchpad.py
@@ -63,7 +63,7 @@ class Launchpad(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.8.1'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ISSUE]
 
diff --git a/perceval/backends/core/mattermost.py b/perceval/backends/core/mattermost.py
index f2fae9b69..8d0d82c2b 100644
--- a/perceval/backends/core/mattermost.py
+++ b/perceval/backends/core/mattermost.py
@@ -79,7 +79,7 @@ class Mattermost(Backend):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.5.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_POST]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/mbox.py b/perceval/backends/core/mbox.py
index 6607e6f96..679fddf56 100644
--- a/perceval/backends/core/mbox.py
+++ b/perceval/backends/core/mbox.py
@@ -67,7 +67,7 @@ class MBox(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.13.2'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
 
diff --git a/perceval/backends/core/mediawiki.py b/perceval/backends/core/mediawiki.py
index 99f100618..f7a227ebc 100644
--- a/perceval/backends/core/mediawiki.py
+++ b/perceval/backends/core/mediawiki.py
@@ -76,7 +76,7 @@ class MediaWiki(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.11.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_PAGE]
 
diff --git a/perceval/backends/core/meetup.py b/perceval/backends/core/meetup.py
index 3b75cb84f..74a399a1c 100644
--- a/perceval/backends/core/meetup.py
+++ b/perceval/backends/core/meetup.py
@@ -72,7 +72,7 @@ class Meetup(Backend):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.17.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_EVENT]
     CLASSIFIED_FIELDS = [
diff --git a/perceval/backends/core/nntp.py b/perceval/backends/core/nntp.py
index 16d6f3132..c0832b26a 100644
--- a/perceval/backends/core/nntp.py
+++ b/perceval/backends/core/nntp.py
@@ -57,7 +57,7 @@ class NNTP(Backend):
     :param tag: label used to mark the data
     :param archive: archive to store/retrieve items
     """
-    version = '0.6.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ARTICLE]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/pagure.py b/perceval/backends/core/pagure.py
index 83ca1f251..c5cb51e0e 100644
--- a/perceval/backends/core/pagure.py
+++ b/perceval/backends/core/pagure.py
@@ -67,7 +67,7 @@ class Pagure(Backend):
         of connection problems
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.1.2'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ISSUE]
 
diff --git a/perceval/backends/core/phabricator.py b/perceval/backends/core/phabricator.py
index c5971ae3c..c5ebf3b3a 100644
--- a/perceval/backends/core/phabricator.py
+++ b/perceval/backends/core/phabricator.py
@@ -62,7 +62,7 @@ class Phabricator(Backend):
     :param ssl_verify: enable/disable SSL verification
     :param blacklist_ids: exclude the ids while fetching
     """
-    version = '0.14.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_TASK]
     ORIGIN_UNIQUE_FIELD = OriginUniqueField(name='id', type=int)
diff --git a/perceval/backends/core/pipermail.py b/perceval/backends/core/pipermail.py
index f82b038aa..d3e6bacbd 100644
--- a/perceval/backends/core/pipermail.py
+++ b/perceval/backends/core/pipermail.py
@@ -67,7 +67,7 @@ class Pipermail(MBox):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.11.1'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
 
diff --git a/perceval/backends/core/redmine.py b/perceval/backends/core/redmine.py
index 6c1bf6e3c..efef97418 100644
--- a/perceval/backends/core/redmine.py
+++ b/perceval/backends/core/redmine.py
@@ -61,7 +61,7 @@ class Redmine(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.11.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ISSUE]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/rocketchat.py b/perceval/backends/core/rocketchat.py
index f1c890e3c..ab99a7127 100644
--- a/perceval/backends/core/rocketchat.py
+++ b/perceval/backends/core/rocketchat.py
@@ -62,7 +62,7 @@ class RocketChat(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.1.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/rss.py b/perceval/backends/core/rss.py
index 234c097d8..aa26a8c67 100644
--- a/perceval/backends/core/rss.py
+++ b/perceval/backends/core/rss.py
@@ -52,7 +52,7 @@ class RSS(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.7.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_ENTRY]
 
diff --git a/perceval/backends/core/slack.py b/perceval/backends/core/slack.py
index c8ca82132..fbd15bd3f 100644
--- a/perceval/backends/core/slack.py
+++ b/perceval/backends/core/slack.py
@@ -61,7 +61,7 @@ class Slack(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.10.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/stackexchange.py b/perceval/backends/core/stackexchange.py
index a3d3efbad..e57e5fe29 100644
--- a/perceval/backends/core/stackexchange.py
+++ b/perceval/backends/core/stackexchange.py
@@ -61,7 +61,7 @@ class StackExchange(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.12.1'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_QUESTION]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/supybot.py b/perceval/backends/core/supybot.py
index 5f5317df0..a9ef05396 100644
--- a/perceval/backends/core/supybot.py
+++ b/perceval/backends/core/supybot.py
@@ -64,7 +64,7 @@ class Supybot(Backend):
     :param tag: label used to mark the data
     :param archive: archive to store/retrieve items
     """
-    version = '0.10.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
 
diff --git a/perceval/backends/core/telegram.py b/perceval/backends/core/telegram.py
index 46b89b846..8f75fac46 100644
--- a/perceval/backends/core/telegram.py
+++ b/perceval/backends/core/telegram.py
@@ -66,7 +66,7 @@ class Telegram(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.11.1'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_MESSAGE]
     EXTRA_SEARCH_FIELDS = {
diff --git a/perceval/backends/core/twitter.py b/perceval/backends/core/twitter.py
index ac8bf53db..ba516d8bb 100644
--- a/perceval/backends/core/twitter.py
+++ b/perceval/backends/core/twitter.py
@@ -75,7 +75,7 @@ class Twitter(Backend):
     :param archive: archive to store/retrieve items
     :param ssl_verify: enable/disable SSL verification
     """
-    version = '0.4.0'
+    version = '1.0.0'
 
     CATEGORIES = [CATEGORY_TWEET]
 
diff --git a/pyproject.toml b/pyproject.toml
index 4097193ef..461e0a782 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ include = [
 ]
 
 classifiers = [
-   "Development Status :: 4 - Beta",
+   "Development Status :: 5 - Production/Stable",
    "Intended Audience :: Developers",
    "Intended Audience :: Science/Research",
    "Topic :: Software Development",
diff --git a/releases/unreleased/first-major-release.yml b/releases/unreleased/first-major-release.yml
new file mode 100644
index 000000000..c66e0b1ec
--- /dev/null
+++ b/releases/unreleased/first-major-release.yml
@@ -0,0 +1,9 @@
+---
+title: First major release
+category: added
+author: Santiago Dueñas <sduenas@bitergia.com>
+issue: null
+notes: >
+  GrimoireLab reached a stable status. This is our
+  first major release.
+