diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9005e352..42d16ae0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ executors:
   # also be updated.
   golang:
     docker:
-      - image: quay.io/prometheus/golang-builder:1.21-base
+      - image: quay.io/prometheus/golang-builder:1.22-base
 jobs:
   test:
     executor: golang
diff --git a/.promu.yml b/.promu.yml
index a4acaa63..ad461ea5 100644
--- a/.promu.yml
+++ b/.promu.yml
@@ -1,7 +1,7 @@
 ---
 go:
     # This must match .circle/config.yml.
-    version: 1.21
+    version: 1.22
 repository:
     path: github.com/prometheus-community/prom-label-proxy
 build:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79f1ad4b..6b9077fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.9.0 / 2024-06-04
+
+* [ENHANCEMENT] Update /api/v1/{rules,alerts} responses. #214
+
 ## 0.8.1 / 2024-01-28
 
 Internal change for library compatibility. No user-visible changes.
diff --git a/VERSION b/VERSION
index 6f4eebdf..ac39a106 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.8.1
+0.9.0
diff --git a/go.mod b/go.mod
index 97ce1c22..502fccfb 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,6 @@
 module github.com/prometheus-community/prom-label-proxy
 
-go 1.21
-
-toolchain go1.21.9
+go 1.22
 
 require (
 	github.com/efficientgo/core v1.0.0-rc.2