diff --git a/.github/workflows/build_packages_cron.yaml b/.github/workflows/build_packages_cron.yaml
index 784454c86..56d5c37f2 100644
--- a/.github/workflows/build_packages_cron.yaml
+++ b/.github/workflows/build_packages_cron.yaml
@@ -24,7 +24,7 @@ jobs:
       matrix:
         profile:
           - ['emqx', 'master', '5.3-2:1.15.7-26.2.1-2']
-          - ['emqx-enterprise', 'release-54', '5.3-2:1.15.7-25.3.2-2']
+          - ['emqx-enterprise', 'release-55', '5.3-2:1.15.7-25.3.2-2']
         os:
           - debian10
           - ubuntu22.04
diff --git a/.github/workflows/codeql.yaml b/.github/workflows/codeql.yaml
index fd982d506..a51ef0d58 100644
--- a/.github/workflows/codeql.yaml
+++ b/.github/workflows/codeql.yaml
@@ -24,7 +24,7 @@ jobs:
       matrix:
         branch:
           - master
-          - release-54
+          - release-55
         language:
           - cpp
           - python
diff --git a/apps/emqx/include/emqx_release.hrl b/apps/emqx/include/emqx_release.hrl
index 0115edc91..6d9a1c22b 100644
--- a/apps/emqx/include/emqx_release.hrl
+++ b/apps/emqx/include/emqx_release.hrl
@@ -32,10 +32,10 @@
 %% `apps/emqx/src/bpapi/README.md'
 
 %% Opensource edition
--define(EMQX_RELEASE_CE, "5.4.1").
+-define(EMQX_RELEASE_CE, "5.5.0").
 
 %% Enterprise edition
--define(EMQX_RELEASE_EE, "5.4.1").
+-define(EMQX_RELEASE_EE, "5.5.0-alpha.1").
 
 %% The HTTP API version
 -define(EMQX_API_VERSION, "5.0").
diff --git a/deploy/charts/emqx-enterprise/Chart.yaml b/deploy/charts/emqx-enterprise/Chart.yaml
index 5f4dc4cdc..59d92aa02 100644
--- a/deploy/charts/emqx-enterprise/Chart.yaml
+++ b/deploy/charts/emqx-enterprise/Chart.yaml
@@ -14,8 +14,8 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 5.4.1
+version: 5.5.0-alpha.1
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
-appVersion: 5.4.1
+appVersion: 5.5.0-alpha.1
diff --git a/deploy/charts/emqx/Chart.yaml b/deploy/charts/emqx/Chart.yaml
index c95573c0a..41f0b37b6 100644
--- a/deploy/charts/emqx/Chart.yaml
+++ b/deploy/charts/emqx/Chart.yaml
@@ -14,8 +14,8 @@ type: application
 
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 5.4.1
+version: 5.5.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
-appVersion: 5.4.1
+appVersion: 5.5.0
diff --git a/scripts/rel/cut.sh b/scripts/rel/cut.sh
index e218f8d0b..136f8c466 100755
--- a/scripts/rel/cut.sh
+++ b/scripts/rel/cut.sh
@@ -20,10 +20,7 @@ options:
   -h|--help:         Print this usage.
 
   -b|--base:         Specify the current release base branch, can be one of
-                     release-51
-                     release-52
-                     release-53
-                     release-54
+                     release-55
                      NOTE: this option should be used when --dryrun.
 
   --dryrun:          Do not actually create the git tag.
@@ -38,7 +35,7 @@ options:
 For 5.X series the current working branch must be 'release-5X'
       --.--[  master  ]---------------------------.-----------.---
          \\                                      /
-          \`---[release-54]----(v5.4.0 | e5.4.0)
+          \`---[release-5X]----(v5.4.0 | e5.4.0)
 EOF
 }
 
@@ -119,29 +116,11 @@ done
 rel_branch() {
     local tag="$1"
     case "$tag" in
-        v5.1.*)
-            echo 'release-51'
+        v5.5.*)
+            echo 'release-55'
             ;;
-        e5.1.*)
-            echo 'release-51'
-            ;;
-        v5.2.*)
-            echo 'release-52'
-            ;;
-        e5.2.*)
-            echo 'release-52'
-            ;;
-        v5.3.*)
-            echo 'release-53'
-            ;;
-        e5.3.*)
-            echo 'release-53'
-            ;;
-        v5.4.*)
-            echo 'release-54'
-            ;;
-        e5.4.*)
-            echo 'release-54'
+        e5.5.*)
+            echo 'release-55'
             ;;
         *)
             logerr "Unsupported version tag $TAG"
diff --git a/scripts/rel/sync-remotes.sh b/scripts/rel/sync-remotes.sh
index 6b41415f0..eb17995c2 100755
--- a/scripts/rel/sync-remotes.sh
+++ b/scripts/rel/sync-remotes.sh
@@ -5,7 +5,7 @@ set -euo pipefail
 # ensure dir
 cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")/../.."
 
-BASE_BRANCHES=( 'release-54' 'release-53' 'release-52' 'release-51' 'master' )
+BASE_BRANCHES=( 'release-55' 'master' )
 
 usage() {
     cat <<EOF
@@ -18,11 +18,8 @@ options:
     It tries to merge (by default with --ff-only option)
     upstreams branches for the current working branch.
     The uppstream branch of the current branch are as below:
-    * release-54: []        # no upstream for 5.4 opensource edition
-    * release-53: []        # no upstream for 5.3 opensource edition
-    * release-52: []        # no upstream for 5.2 opensource edition
-    * release-51: []        # no upstream for 5.1 opensource edition
-    * master: [release-54]  # sync release-54 to master
+    * release-55: []        # no upstream for 5.5 opensource edition
+    * master: [release-55]  # sync release-55 to master
 
   -b|--base:
     The base branch of current working branch if currently is not
@@ -154,20 +151,11 @@ remote_refs() {
 upstream_branches() {
     local base="$1"
     case "$base" in
-        release-54)
-            remote_ref "$base"
-            ;;
-        release-53)
-            remote_ref "$base"
-            ;;
-        release-52)
-            remote_ref "$base"
-            ;;
-        release-51)
+        release-55)
             remote_ref "$base"
             ;;
         master)
-            remote_refs "$base" 'release-54'
+            remote_refs "$base" 'release-55'
             ;;
     esac
 }