diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f178d4821..0a2b7bf9f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,10 @@
 
 ## unreleased
 
+## 2.55.0-rc.1 / 2024-10-16
+
 * [FEATURE] PromQL: Add experimental `info` function. #14495
+* [BUGFIX] PromQL: make sort_by_label stable. #14985
 
 ## 2.55.0-rc.0 / 2024-09-20
 
@@ -14,6 +17,7 @@
 * [FEATURE] Remote-Write: Support Google Cloud Monitoring authorization. #14346
 * [FEATURE] Promtool: `tsdb create-blocks` new option to add labels. #14403
 * [FEATURE] Promtool: `promtool test` adds `--junit` flag to format results. #14506
+* [FEATURE] TSDB: Add `delayed-compaction` feature flag, for people running many Prometheus to randomize timing. #12532
 * [ENHANCEMENT] OTLP receiver: Warn on exponential histograms with zero count and non-zero sum. #14706
 * [ENHANCEMENT] OTLP receiver: Interrupt translation on context cancellation/timeout. #14612
 * [ENHANCEMENT] Remote Read client: Enable streaming remote read if the server supports it. #11379
@@ -25,7 +29,7 @@
 * [ENHANCEMENT] Tracing: Improve PromQL tracing, including showing the operation performed for aggregates, operators, and calls. #14816
 * [ENHANCEMENT] API: Support multiple listening addresses. #14665
 * [ENHANCEMENT] TSDB: Backward compatibility with upcoming index v3. #14934
-* [PERF] TSDB: Query in-order and out-of-order series together. #14354, #14693, #14714, #14831, #14874, #14948
+* [PERF] TSDB: Query in-order and out-of-order series together. #14354, #14693, #14714, #14831, #14874, #14948, #15120
 * [PERF] TSDB: Streamline reading of overlapping out-of-order head chunks. #14729
 * [BUGFIX] SD: Fix dropping targets (with feature flag `new-service-discovery-manager`). #13147
 * [BUGFIX] SD: Stop storing stale targets (with feature flag `new-service-discovery-manager`). #13622
diff --git a/VERSION b/VERSION
index 95a9e5028a..2e8119e64e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.55.0-rc.0
+2.55.0-rc.1
diff --git a/web/ui/module/codemirror-promql/package.json b/web/ui/module/codemirror-promql/package.json
index 1589781dcb..c3ec6a343d 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": "0.55.0-rc.0",
+  "version": "0.55.0-rc.1",
   "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": "0.55.0-rc.0",
+    "@prometheus-io/lezer-promql": "0.55.0-rc.1",
     "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 ba68d5622d..f9306adcb9 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": "0.55.0-rc.0",
+  "version": "0.55.0-rc.1",
   "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 99a6516bfd..381458f1ba 100644
--- a/web/ui/package-lock.json
+++ b/web/ui/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "prometheus-io",
-  "version": "0.55.0-rc.0",
+  "version": "0.55.0-rc.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "prometheus-io",
-      "version": "0.55.0-rc.0",
+      "version": "0.55.0-rc.1",
       "workspaces": [
         "react-app",
         "module/*"
@@ -30,10 +30,10 @@
     },
     "module/codemirror-promql": {
       "name": "@prometheus-io/codemirror-promql",
-      "version": "0.55.0-rc.0",
+      "version": "0.55.0-rc.1",
       "license": "Apache-2.0",
       "dependencies": {
-        "@prometheus-io/lezer-promql": "0.55.0-rc.0",
+        "@prometheus-io/lezer-promql": "0.55.0-rc.1",
         "lru-cache": "^7.18.3"
       },
       "devDependencies": {
@@ -69,7 +69,7 @@
     },
     "module/lezer-promql": {
       "name": "@prometheus-io/lezer-promql",
-      "version": "0.55.0-rc.0",
+      "version": "0.55.0-rc.1",
       "license": "Apache-2.0",
       "devDependencies": {
         "@lezer/generator": "^1.7.1",
@@ -19352,7 +19352,7 @@
     },
     "react-app": {
       "name": "@prometheus-io/app",
-      "version": "0.55.0-rc.0",
+      "version": "0.55.0-rc.1",
       "dependencies": {
         "@codemirror/autocomplete": "^6.17.0",
         "@codemirror/commands": "^6.6.0",
@@ -19370,7 +19370,7 @@
         "@lezer/lr": "^1.4.2",
         "@nexucis/fuzzy": "^0.4.1",
         "@nexucis/kvsearch": "^0.8.1",
-        "@prometheus-io/codemirror-promql": "0.55.0-rc.0",
+        "@prometheus-io/codemirror-promql": "0.55.0-rc.1",
         "bootstrap": "^4.6.2",
         "css.escape": "^1.5.1",
         "downshift": "^9.0.6",
diff --git a/web/ui/package.json b/web/ui/package.json
index 2525d295c3..9371d795e0 100644
--- a/web/ui/package.json
+++ b/web/ui/package.json
@@ -28,5 +28,5 @@
     "ts-jest": "^29.2.2",
     "typescript": "^4.9.5"
   },
-  "version": "0.55.0-rc.0"
+  "version": "0.55.0-rc.1"
 }
diff --git a/web/ui/react-app/package.json b/web/ui/react-app/package.json
index 5cf490496c..d91adb7edc 100644
--- a/web/ui/react-app/package.json
+++ b/web/ui/react-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prometheus-io/app",
-  "version": "0.55.0-rc.0",
+  "version": "0.55.0-rc.1",
   "private": true,
   "dependencies": {
     "@codemirror/autocomplete": "^6.17.0",
@@ -19,7 +19,7 @@
     "@lezer/lr": "^1.4.2",
     "@nexucis/fuzzy": "^0.4.1",
     "@nexucis/kvsearch": "^0.8.1",
-    "@prometheus-io/codemirror-promql": "0.55.0-rc.0",
+    "@prometheus-io/codemirror-promql": "0.55.0-rc.1",
     "bootstrap": "^4.6.2",
     "css.escape": "^1.5.1",
     "downshift": "^9.0.6",