diff --git a/CHANGELOG.md b/CHANGELOG.md
index db9850c44..68efc2036 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Unreleased changes
 
-[Full changelog](https://github.com/mozilla/glean.js/compare/v5.0.8...main)
+[Full changelog](https://github.com/mozilla/glean.js/compare/v5.1.0...main)
+
+# v5.1.0 (2026-10-21)
+
+[Full changelog](https://github.com/mozilla/glean.js/compare/v5.0.8...v5.1.0)
 
 * [#2096](https://github.com/mozilla/glean.js/pull/2096): Bumped `glean_parser` version to `22.0`.
   * `CommonMetricData` now accepts the optional `inSession` property emitted by `glean_parser` 20.0.1+. Session sampling is not yet supported by Glean.js, so it is currently ignored.
diff --git a/automation/package-lock.json b/automation/package-lock.json
index fd11facd0..42741d404 100644
--- a/automation/package-lock.json
+++ b/automation/package-lock.json
@@ -638,7 +638,6 @@
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.11.3.tgz",
       "integrity": "sha512-Y9rRfJG5jcKOE0CLisYbojUjIrIEE7AGMzA/Sm4BslANhbS+cDMpgBdcPT91oJ7OuJ9hYJBx59RjbhxVnrF8Xg==",
       "dev": true,
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -672,7 +671,6 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
       "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -977,7 +975,6 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
-      "peer": true,
       "dependencies": {
         "caniuse-lite": "^1.0.30001580",
         "electron-to-chromium": "^1.4.648",
@@ -4630,7 +4627,6 @@
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.92.1.tgz",
       "integrity": "sha512-JECQ7IwJb+7fgUFBlrJzbyu3GEuNBcdqr1LD7IbSzwkSmIevTm8PF+wej3Oxuz/JFBUZ6O1o43zsPkwm1C4TmA==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@types/eslint-scope": "^3.7.3",
         "@types/estree": "^1.0.5",
@@ -4678,7 +4674,6 @@
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-5.1.4.tgz",
       "integrity": "sha512-pIDJHIEI9LR0yxHXQ+Qh95k2EvXpWzZ5l+d+jIo+RdSm9MiHfzazIxwwni/p7+x4eJZuvG1AJwgC4TNQ7NRgsg==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@discoveryjs/json-ext": "^0.5.0",
         "@webpack-cli/configtest": "^2.1.1",
@@ -4762,7 +4757,6 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
       "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
         "json-schema-traverse": "^1.0.0",
@@ -4875,7 +4869,6 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
       "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
         "json-schema-traverse": "^1.0.0",
@@ -5744,8 +5737,7 @@
       "version": "8.11.3",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.11.3.tgz",
       "integrity": "sha512-Y9rRfJG5jcKOE0CLisYbojUjIrIEE7AGMzA/Sm4BslANhbS+cDMpgBdcPT91oJ7OuJ9hYJBx59RjbhxVnrF8Xg==",
-      "dev": true,
-      "peer": true
+      "dev": true
     },
     "acorn-import-attributes": {
       "version": "1.9.5",
@@ -5768,7 +5760,6 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
       "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "dev": true,
-      "peer": true,
       "requires": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -6002,7 +5993,6 @@
       "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.22.3.tgz",
       "integrity": "sha512-UAp55yfwNv0klWNapjs/ktHoguxuQNGnOzxYmfnXIS+8AsRDZkSDxg7R1AX3GKzn078SBI5dzwzj/Yx0Or0e3A==",
       "dev": true,
-      "peer": true,
       "requires": {
         "caniuse-lite": "^1.0.30001580",
         "electron-to-chromium": "^1.4.648",
@@ -8704,7 +8694,6 @@
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.92.1.tgz",
       "integrity": "sha512-JECQ7IwJb+7fgUFBlrJzbyu3GEuNBcdqr1LD7IbSzwkSmIevTm8PF+wej3Oxuz/JFBUZ6O1o43zsPkwm1C4TmA==",
       "dev": true,
-      "peer": true,
       "requires": {
         "@types/eslint-scope": "^3.7.3",
         "@types/estree": "^1.0.5",
@@ -8737,7 +8726,6 @@
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-5.1.4.tgz",
       "integrity": "sha512-pIDJHIEI9LR0yxHXQ+Qh95k2EvXpWzZ5l+d+jIo+RdSm9MiHfzazIxwwni/p7+x4eJZuvG1AJwgC4TNQ7NRgsg==",
       "dev": true,
-      "peer": true,
       "requires": {
         "@discoveryjs/json-ext": "^0.5.0",
         "@webpack-cli/configtest": "^2.1.1",
@@ -8781,7 +8769,6 @@
           "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
           "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
           "dev": true,
-          "peer": true,
           "requires": {
             "fast-deep-equal": "^3.1.1",
             "json-schema-traverse": "^1.0.0",
@@ -8861,7 +8848,6 @@
           "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
           "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
           "dev": true,
-          "peer": true,
           "requires": {
             "fast-deep-equal": "^3.1.1",
             "json-schema-traverse": "^1.0.0",
diff --git a/glean/package-lock.json b/glean/package-lock.json
index 169a66672..8e1b6d186 100644
--- a/glean/package-lock.json
+++ b/glean/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@mozilla/glean",
-  "version": "5.0.8",
+  "version": "5.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@mozilla/glean",
-      "version": "5.0.8",
+      "version": "5.1.0",
       "license": "MPL-2.0",
       "dependencies": {
         "fflate": "^0.8.2",
diff --git a/glean/package.json b/glean/package.json
index bb4ebfd3d..9a09a0d4c 100644
--- a/glean/package.json
+++ b/glean/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mozilla/glean",
-  "version": "5.0.8",
+  "version": "5.1.0",
   "description": "An implementation of the Glean SDK, a modern cross-platform telemetry client, for JavaScript environments.",
   "type": "module",
   "sideEffects": false,
diff --git a/glean/src/core/constants.ts b/glean/src/core/constants.ts
index a534f4cdc..6dd506eb7 100644
--- a/glean/src/core/constants.ts
+++ b/glean/src/core/constants.ts
@@ -8,7 +8,7 @@ export const GLEAN_SCHEMA_VERSION = 1;
 //
 // PACKAGE_VERSION is defined as a global by webpack,
 // we need a default here for testing when the app is not build with webpack.
-export const GLEAN_VERSION = "5.0.8";
+export const GLEAN_VERSION = "5.1.0";
 
 // The name of a "ping" that will include Glean ping_info metrics,
 // such as ping sequence numbers.