diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a08010..6182cdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.4.3] — 2026-07-11
+
+### Bug fixes
+
+- NodeInfo 2.0 response now includes the required `$schema` field (`http://nodeinfo.diaspora.software/ns/schema/2.0#`). Validators like browser.pub rejected the previous response for missing it.
+
+---
+
 ## [0.4.2] — 2026-07-10
 
 ### New features
diff --git a/Cargo.lock b/Cargo.lock
index 17e990d..b9580be 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1368,7 +1368,7 @@ dependencies = [
 
 [[package]]
 name = "k-ap"
-version = "0.4.2"
+version = "0.4.3"
 dependencies = [
  "activitypub_federation",
  "anyhow",
diff --git a/Cargo.toml b/Cargo.toml
index d6441de..d94d4e3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "k-ap"
-version = "0.4.2"
+version = "0.4.3"
 edition = "2024"
 description = "Generic ActivityPub protocol layer"
 license = "MIT"
diff --git a/src/nodeinfo.rs b/src/nodeinfo.rs
index db0d538..d8dc6c2 100644
--- a/src/nodeinfo.rs
+++ b/src/nodeinfo.rs
@@ -6,6 +6,7 @@ use crate::data::FederationData;
 use crate::error::Error;
 
 const NODEINFO_2_0_REL: &str = "http://nodeinfo.diaspora.software/ns/schema/2.0";
+const NODEINFO_2_0_SCHEMA: &str = "http://nodeinfo.diaspora.software/ns/schema/2.0#";
 
 #[derive(Serialize)]
 pub struct NodeInfoWellKnown {
@@ -39,6 +40,8 @@ pub struct NodeInfoUsers {
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct NodeInfo {
+    #[serde(rename = "$schema")]
+    pub schema: String,
     pub version: String,
     pub software: NodeInfoSoftware,
     pub protocols: Vec<String>,
@@ -63,6 +66,7 @@ pub async fn nodeinfo_handler(data: Data<FederationData>) -> Result<Json<NodeInf
     let local_posts = data.content_reader.count_local_posts().await.unwrap_or(0);
 
     Ok(Json(NodeInfo {
+        schema: NODEINFO_2_0_SCHEMA.to_string(),
         version: "2.0".to_string(),
         software: NodeInfoSoftware {
             name: data.software_name.clone(),
diff --git a/src/tests/nodeinfo.rs b/src/tests/nodeinfo.rs
index 898e1bf..9917112 100644
--- a/src/tests/nodeinfo.rs
+++ b/src/tests/nodeinfo.rs
@@ -19,6 +19,7 @@ fn nodeinfo_well_known_serializes_correctly() {
 #[test]
 fn nodeinfo_serializes_camel_case() {
     let doc = NodeInfo {
+        schema: "http://nodeinfo.diaspora.software/ns/schema/2.0#".to_string(),
         version: "2.0".to_string(),
         software: NodeInfoSoftware {
             name: "my-app".to_string(),
@@ -32,6 +33,10 @@ fn nodeinfo_serializes_camel_case() {
         open_registrations: false,
     };
     let json = serde_json::to_value(&doc).unwrap();
+    assert_eq!(
+        json["$schema"],
+        "http://nodeinfo.diaspora.software/ns/schema/2.0#"
+    );
     assert_eq!(json["version"], "2.0");
     assert_eq!(json["software"]["name"], "my-app");
     assert_eq!(json["usage"]["users"]["total"], 3);