diff --git a/5.1/alpine3.21/Dockerfile b/5.1/alpine3.23/Dockerfile
similarity index 99%
rename from 5.1/alpine3.21/Dockerfile
rename to 5.1/alpine3.23/Dockerfile
index 2704f30..5531d8e 100644
--- a/5.1/alpine3.21/Dockerfile
+++ b/5.1/alpine3.23/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM ruby:3.2-alpine3.21
+FROM ruby:3.2-alpine3.23
 
 # explicitly set uid/gid to guarantee that it won't change in the future
 # the values 999:999 are identical to the current user/group id assigned
diff --git a/5.1/alpine3.21/docker-entrypoint.sh b/5.1/alpine3.23/docker-entrypoint.sh
similarity index 100%
rename from 5.1/alpine3.21/docker-entrypoint.sh
rename to 5.1/alpine3.23/docker-entrypoint.sh
diff --git a/6.0/alpine3.21/Dockerfile b/6.0/alpine3.23/Dockerfile
similarity index 99%
rename from 6.0/alpine3.21/Dockerfile
rename to 6.0/alpine3.23/Dockerfile
index ef3bf5f..2cb52e9 100644
--- a/6.0/alpine3.21/Dockerfile
+++ b/6.0/alpine3.23/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM ruby:3.3-alpine3.21
+FROM ruby:3.3-alpine3.23
 
 # explicitly set uid/gid to guarantee that it won't change in the future
 # the values 999:999 are identical to the current user/group id assigned
diff --git a/6.0/alpine3.21/docker-entrypoint.sh b/6.0/alpine3.23/docker-entrypoint.sh
similarity index 100%
rename from 6.0/alpine3.21/docker-entrypoint.sh
rename to 6.0/alpine3.23/docker-entrypoint.sh
diff --git a/6.1/alpine3.21/Dockerfile b/6.1/alpine3.23/Dockerfile
similarity index 99%
rename from 6.1/alpine3.21/Dockerfile
rename to 6.1/alpine3.23/Dockerfile
index 3a49468..413d6ce 100644
--- a/6.1/alpine3.21/Dockerfile
+++ b/6.1/alpine3.23/Dockerfile
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM ruby:3.4-alpine3.21
+FROM ruby:3.4-alpine3.23
 
 # explicitly set uid/gid to guarantee that it won't change in the future
 # the values 999:999 are identical to the current user/group id assigned
diff --git a/6.1/alpine3.21/docker-entrypoint.sh b/6.1/alpine3.23/docker-entrypoint.sh
similarity index 100%
rename from 6.1/alpine3.21/docker-entrypoint.sh
rename to 6.1/alpine3.23/docker-entrypoint.sh
diff --git a/versions.json b/versions.json
index 1c89e2d..2212638 100644
--- a/versions.json
+++ b/versions.json
@@ -1,6 +1,6 @@
 {
   "5.1": {
-    "alpine": "3.22",
+    "alpine": "3.23",
     "debian": "trixie",
     "downloadUrl": "https://www.redmine.org/releases/redmine-5.1.10.tar.gz",
     "ruby": {
@@ -10,13 +10,13 @@
     "variants": [
       "trixie",
       "bookworm",
-      "alpine3.22",
-      "alpine3.21"
+      "alpine3.23",
+      "alpine3.22"
     ],
     "version": "5.1.10"
   },
   "6.0": {
-    "alpine": "3.22",
+    "alpine": "3.23",
     "debian": "trixie",
     "downloadUrl": "https://www.redmine.org/releases/redmine-6.0.7.tar.gz",
     "ruby": {
@@ -26,13 +26,13 @@
     "variants": [
       "trixie",
       "bookworm",
-      "alpine3.22",
-      "alpine3.21"
+      "alpine3.23",
+      "alpine3.22"
     ],
     "version": "6.0.7"
   },
   "6.1": {
-    "alpine": "3.22",
+    "alpine": "3.23",
     "debian": "trixie",
     "downloadUrl": "https://www.redmine.org/releases/redmine-6.1.0.tar.gz",
     "ruby": {
@@ -42,8 +42,8 @@
     "variants": [
       "trixie",
       "bookworm",
-      "alpine3.22",
-      "alpine3.21"
+      "alpine3.23",
+      "alpine3.22"
     ],
     "version": "6.1.0"
   }
diff --git a/versions.sh b/versions.sh
index d2f3285..19b4fff 100755
--- a/versions.sh
+++ b/versions.sh
@@ -6,8 +6,8 @@ supportedDebianSuites=(
 	bookworm
 )
 supportedAlpineVersions=(
+	3.23
 	3.22
-	3.21
 )
 
 defaultDebianSuite="${supportedDebianSuites[0]}"