diff --git a/CHANGELOG.md b/CHANGELOG.md
index 046d3ea60ae..eee024f1dfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 2.51.2 / 2024-04-09
+
+Bugfix release.
+
+[BUGFIX] Notifier: could hang when using relabeling on alerts #13861
+
 ## 2.51.1 / 2024-03-27
 
 Bugfix release.
diff --git a/VERSION b/VERSION
index 8e00e241f3c..587b583f919 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.51.1
+2.51.2
diff --git a/web/ui/module/codemirror-promql/package.json b/web/ui/module/codemirror-promql/package.json
index c364e05584f..1e50b43b53c 100644
--- a/web/ui/module/codemirror-promql/package.json
+++ b/web/ui/module/codemirror-promql/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prometheus-io/codemirror-promql",
-  "version": "0.51.1",
+  "version": "0.51.2",
   "description": "a CodeMirror mode for the PromQL language",
   "types": "dist/esm/index.d.ts",
   "module": "dist/esm/index.js",
@@ -29,7 +29,7 @@
   },
   "homepage": "https://github.com/prometheus/prometheus/blob/main/web/ui/module/codemirror-promql/README.md",
   "dependencies": {
-    "@prometheus-io/lezer-promql": "0.51.1",
+    "@prometheus-io/lezer-promql": "0.51.2",
     "lru-cache": "^7.18.3"
   },
   "devDependencies": {
diff --git a/web/ui/module/lezer-promql/package.json b/web/ui/module/lezer-promql/package.json
index f5ea66602f8..494458a47a5 100644
--- a/web/ui/module/lezer-promql/package.json
+++ b/web/ui/module/lezer-promql/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prometheus-io/lezer-promql",
-  "version": "0.51.1",
+  "version": "0.51.2",
   "description": "lezer-based PromQL grammar",
   "main": "dist/index.cjs",
   "type": "module",
diff --git a/web/ui/package-lock.json b/web/ui/package-lock.json
index fdb348d669e..ecdbf18a11f 100644
--- a/web/ui/package-lock.json
+++ b/web/ui/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "prometheus-io",
-  "version": "0.51.1",
+  "version": "0.51.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "prometheus-io",
-      "version": "0.51.1",
+      "version": "0.51.2",
       "workspaces": [
         "react-app",
         "module/*"
@@ -30,10 +30,10 @@
     },
     "module/codemirror-promql": {
       "name": "@prometheus-io/codemirror-promql",
-      "version": "0.51.1",
+      "version": "0.51.2",
       "license": "Apache-2.0",
       "dependencies": {
-        "@prometheus-io/lezer-promql": "0.51.1",
+        "@prometheus-io/lezer-promql": "0.51.2",
         "lru-cache": "^7.18.3"
       },
       "devDependencies": {
@@ -69,7 +69,7 @@
     },
     "module/lezer-promql": {
       "name": "@prometheus-io/lezer-promql",
-      "version": "0.51.1",
+      "version": "0.51.2",
       "license": "Apache-2.0",
       "devDependencies": {
         "@lezer/generator": "^1.5.1",
@@ -19233,7 +19233,7 @@
     },
     "react-app": {
       "name": "@prometheus-io/app",
-      "version": "0.51.1",
+      "version": "0.51.2",
       "dependencies": {
         "@codemirror/autocomplete": "^6.11.1",
         "@codemirror/commands": "^6.3.2",
@@ -19251,7 +19251,7 @@
         "@lezer/lr": "^1.3.14",
         "@nexucis/fuzzy": "^0.4.1",
         "@nexucis/kvsearch": "^0.8.1",
-        "@prometheus-io/codemirror-promql": "0.51.1",
+        "@prometheus-io/codemirror-promql": "0.51.2",
         "bootstrap": "^4.6.2",
         "css.escape": "^1.5.1",
         "downshift": "^7.6.2",
diff --git a/web/ui/package.json b/web/ui/package.json
index 0772aad7de1..9c58f592c16 100644
--- a/web/ui/package.json
+++ b/web/ui/package.json
@@ -28,5 +28,5 @@
     "ts-jest": "^29.1.1",
     "typescript": "^4.9.5"
   },
-  "version": "0.51.1"
+  "version": "0.51.2"
 }
diff --git a/web/ui/react-app/package.json b/web/ui/react-app/package.json
index b47c9180a33..bd600720e20 100644
--- a/web/ui/react-app/package.json
+++ b/web/ui/react-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prometheus-io/app",
-  "version": "0.51.1",
+  "version": "0.51.2",
   "private": true,
   "dependencies": {
     "@codemirror/autocomplete": "^6.11.1",
@@ -19,7 +19,7 @@
     "@lezer/lr": "^1.3.14",
     "@nexucis/fuzzy": "^0.4.1",
     "@nexucis/kvsearch": "^0.8.1",
-    "@prometheus-io/codemirror-promql": "0.51.1",
+    "@prometheus-io/codemirror-promql": "0.51.2",
     "bootstrap": "^4.6.2",
     "css.escape": "^1.5.1",
     "downshift": "^7.6.2",