diff --git a/README.md b/README.md
index 8c04801..5653c61 100644
--- a/README.md
+++ b/README.md
@@ -199,8 +199,8 @@ Rust/Axum responder on port `2560`.
 
 - KCA publishes `ocsp:<KCA CA UUID>` whenever certificates are issued, renewed,
   revoked, deleted or imported. Revocation reasons are included; this is a full
-  status snapshot, not a revoked-only list. OCSP keys are separate from session
-  keys through their prefix.
+  CBOR-encoded status snapshot, not a revoked-only list. OCSP keys are separate
+  from session keys through their prefix.
 - The responder has no Postgres or KCA master-key access. It reads only OCSP
   snapshots from Redis and uses a delegated OCSP signing certificate/key per
   CA. Where Redis ACLs are available, restrict the responder to `ocsp:*` so it
diff --git a/ocsp-responder/Cargo.lock b/ocsp-responder/Cargo.lock
index ae0a3e0..3dba814 100644
--- a/ocsp-responder/Cargo.lock
+++ b/ocsp-responder/Cargo.lock
@@ -175,6 +175,15 @@ version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc652a48c352aef3ea3aed32080501cf3ef6ed5da78602a020c991775b0aff04"
 
+[[package]]
+name = "cbor2"
+version = "1.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddf90b4df9f396c3b5dad07dcdaf0627f2b8ae533ea9be9937f9d6b8713cb888"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "cc"
 version = "1.9.0"
@@ -752,6 +761,7 @@ dependencies = [
  "axum",
  "base64",
  "bytes",
+ "cbor2",
  "chrono",
  "const-oid",
  "der",
@@ -763,7 +773,6 @@ dependencies = [
  "rsa",
  "sec1",
  "serde",
- "serde_json",
  "serde_yaml",
  "sha1",
  "sha2",
diff --git a/ocsp-responder/Cargo.toml b/ocsp-responder/Cargo.toml
index a8eb0cc..bbfe401 100644
--- a/ocsp-responder/Cargo.toml
+++ b/ocsp-responder/Cargo.toml
@@ -11,7 +11,7 @@ tower-http = { version = "0.6", features = ["limit", "trace", "timeout"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
 serde = { version = "1", features = ["derive"] }
-serde_json = "1"
+cbor2 = "1"
 serde_yaml = "0.9"
 chrono = { version = "0.4", features = ["serde"] }
 thiserror = "2"
diff --git a/ocsp-responder/README.md b/ocsp-responder/README.md
index 722093b..49f1335 100644
--- a/ocsp-responder/README.md
+++ b/ocsp-responder/README.md
@@ -1,6 +1,6 @@
 # KCA OCSP responder
 
-Standalone Rust/Axum responder. It reads one full JSON status snapshot per CA
+Standalone Rust/Axum responder. It reads one full CBOR status snapshot per CA
 from Redis, caches it for one second with a single-flight refresh, and signs
 OCSP responses with a delegated responder certificate.
 
@@ -31,10 +31,11 @@ certificate exists in multiple vaults. The responder validates both this ID and
 the CA certificate fingerprint against every downloaded snapshot.
 
 KCA publishes these keys when `REDIS_URL` is configured. The
-`kca-ocsp-status/v2` JSON contains all certificates issued by that CA, both
-valid and revoked, without a generation timestamp. Freshness is carried by the
-Redis key TTL. The responder never infers status from a partial revoked-only
-list.
+`kca-ocsp-status/v2` payload is encoded with CBOR and contains all certificates
+issued by that CA, both valid and revoked, without a generation timestamp.
+Freshness is carried by the Redis key TTL. The responder never infers status
+from a partial revoked-only list. Publisher and responder upgrades must be
+coordinated because legacy JSON payloads are rejected until republished.
 
 ## Run locally
 
diff --git a/ocsp-responder/src/cache.rs b/ocsp-responder/src/cache.rs
index e45447e..a4871a3 100644
--- a/ocsp-responder/src/cache.rs
+++ b/ocsp-responder/src/cache.rs
@@ -135,11 +135,11 @@ mod tests {
     use bytes::Bytes;
 
     use super::*;
-    use crate::snapshot::sha256_hex;
+    use crate::snapshot::{sha256_hex, test_body as body};
     use crate::store::{ObjectStore, StoreError, StoredSnapshot};
 
     struct FakeStore {
-        body: String,
+        body: Vec<u8>,
         expires_at: SystemTime,
         calls: AtomicUsize,
         fail: AtomicBool,
@@ -147,7 +147,7 @@ mod tests {
     }
 
     impl FakeStore {
-        fn new(body: String, lifetime: Duration) -> Self {
+        fn new(body: Vec<u8>, lifetime: Duration) -> Self {
             Self {
                 body,
                 expires_at: SystemTime::now() + lifetime,
@@ -157,7 +157,7 @@ mod tests {
             }
         }
 
-        fn expired(body: String) -> Self {
+        fn expired(body: Vec<u8>) -> Self {
             Self {
                 body,
                 expires_at: SystemTime::now() - Duration::from_secs(1),
@@ -185,12 +185,6 @@ mod tests {
         }
     }
 
-    fn body(sha: &str) -> String {
-        format!(
-            r#"{{"schema":"kca-ocsp-status/v2","issuer":{{"id":"ca","sha256":"{sha}"}},"entries":[{{"serial_hex":"01","status":"valid"}}]}}"#
-        )
-    }
-
     #[tokio::test]
     async fn single_flight_refreshes_once() {
         let sha = sha256_hex(b"ca");
diff --git a/ocsp-responder/src/snapshot.rs b/ocsp-responder/src/snapshot.rs
index 44db107..1a95ee5 100644
--- a/ocsp-responder/src/snapshot.rs
+++ b/ocsp-responder/src/snapshot.rs
@@ -3,7 +3,7 @@
 use std::collections::HashMap;
 
 use chrono::{DateTime, Utc};
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 use sha1::{Digest as _, Sha1};
 use sha2::Sha256;
 use x509_cert::ext::pkix::CrlReason;
@@ -28,7 +28,7 @@ pub struct Snapshot {
     pub entries: HashMap<Vec<u8>, StatusEntry>,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Serialize)]
 struct RawSnapshot {
     schema: String,
     issuer: RawIssuer,
@@ -36,7 +36,7 @@ struct RawSnapshot {
     entries: Vec<RawEntry>,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Serialize)]
 struct RawIssuer {
     #[serde(default)]
     id: String,
@@ -44,7 +44,7 @@ struct RawIssuer {
     sha256: String,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Serialize)]
 struct RawEntry {
     serial_hex: String,
     status: String,
@@ -61,7 +61,9 @@ impl Snapshot {
         expected_sha256: &str,
         expected_ca_id: &str,
     ) -> Result<Self, SnapshotError> {
-        let raw: RawSnapshot = serde_json::from_slice(bytes)?;
+        cbor2::validate_slice(bytes).map_err(|error| SnapshotError::Cbor(error.to_string()))?;
+        let raw: RawSnapshot =
+            cbor2::from_slice(bytes).map_err(|error| SnapshotError::Cbor(error.to_string()))?;
         if raw.schema != SCHEMA {
             return Err(SnapshotError::Schema(raw.schema));
         }
@@ -166,8 +168,8 @@ pub fn hash_sha256(bytes: &[u8]) -> Vec<u8> {
 
 #[derive(Debug, thiserror::Error)]
 pub enum SnapshotError {
-    #[error("invalid JSON: {0}")]
-    Json(#[from] serde_json::Error),
+    #[error("invalid CBOR: {0}")]
+    Cbor(String),
     #[error("unsupported snapshot schema {0:?}")]
     Schema(String),
     #[error("snapshot issuer ID {actual} does not match configured CA ID {expected}")]
@@ -184,27 +186,64 @@ pub enum SnapshotError {
     DuplicateSerial(String),
 }
 
+#[cfg(test)]
+pub(crate) fn test_body(sha: &str) -> Vec<u8> {
+    let raw = RawSnapshot {
+        schema: SCHEMA.to_string(),
+        issuer: RawIssuer {
+            id: "ca".to_string(),
+            sha256: sha.to_string(),
+        },
+        entries: vec![RawEntry {
+            serial_hex: "01".to_string(),
+            status: "valid".to_string(),
+            revoked_at: None,
+            reason: None,
+        }],
+    };
+    cbor2::to_vec(&raw).unwrap()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
-    fn body(sha: &str) -> String {
-        format!(
-            r#"{{
-              "schema": "kca-ocsp-status/v2",
-              "issuer": {{"id": "ca", "sha256": "{sha}", "subject": "CN=CA"}},
-              "entries": [
-                {{"serial_hex": "01ab", "status": "valid", "not_after": "2027-01-01T00:00:00Z"}},
-                {{"serial_hex": "00ff", "status": "revoked", "revoked_at": "2026-02-03T04:05:06Z", "reason": "keyCompromise"}}
-              ]
-            }}"#
-        )
+    fn raw_body(sha: &str, schema: &str) -> RawSnapshot {
+        RawSnapshot {
+            schema: schema.to_string(),
+            issuer: RawIssuer {
+                id: "ca".to_string(),
+                sha256: sha.to_string(),
+            },
+            entries: vec![
+                RawEntry {
+                    serial_hex: "01ab".to_string(),
+                    status: "valid".to_string(),
+                    revoked_at: None,
+                    reason: None,
+                },
+                RawEntry {
+                    serial_hex: "00ff".to_string(),
+                    status: "revoked".to_string(),
+                    revoked_at: Some(
+                        DateTime::parse_from_rfc3339("2026-02-03T04:05:06Z")
+                            .unwrap()
+                            .with_timezone(&Utc),
+                    ),
+                    reason: Some("keyCompromise".to_string()),
+                },
+            ],
+        }
+    }
+
+    fn body(sha: &str) -> Vec<u8> {
+        cbor2::to_vec(&raw_body(sha, SCHEMA)).unwrap()
     }
 
     #[test]
     fn parses_statuses_and_reasons() {
         let sha = sha256_hex(b"ca");
-        let snapshot = Snapshot::parse(body(&sha).as_bytes(), &sha, "ca").unwrap();
+        let snapshot = Snapshot::parse(&body(&sha), &sha, "ca").unwrap();
         let good = snapshot.status_for_serial(&[0x01, 0xab]).unwrap();
         assert_eq!(good.status, Status::Good);
         let revoked = snapshot.status_for_serial(&[0xff]).unwrap();
@@ -216,15 +255,28 @@ mod tests {
     #[test]
     fn rejects_wrong_issuer_schema_and_duplicates() {
         let sha = sha256_hex(b"ca");
-        assert!(Snapshot::parse(body(&sha).as_bytes(), "wrong", "ca").is_err());
+        assert!(Snapshot::parse(&body(&sha), "wrong", "ca").is_err());
         assert!(matches!(
-            Snapshot::parse(body(&sha).as_bytes(), &sha, "other"),
+            Snapshot::parse(&body(&sha), &sha, "other"),
             Err(SnapshotError::IssuerIdMismatch { .. })
         ));
-        let wrong_schema = body(&sha).replace(SCHEMA, "other");
-        assert!(Snapshot::parse(wrong_schema.as_bytes(), &sha, "ca").is_err());
-        let duplicate = body(&sha).replace("\"00ff\"", "\"01ab\"");
-        assert!(Snapshot::parse(duplicate.as_bytes(), &sha, "ca").is_err());
+        let wrong_schema = cbor2::to_vec(&raw_body(&sha, "other")).unwrap();
+        assert!(Snapshot::parse(&wrong_schema, &sha, "ca").is_err());
+        let mut duplicate = raw_body(&sha, SCHEMA);
+        duplicate.entries[1].serial_hex = duplicate.entries[0].serial_hex.clone();
+        let duplicate = cbor2::to_vec(&duplicate).unwrap();
+        assert!(Snapshot::parse(&duplicate, &sha, "ca").is_err());
+    }
+
+    #[test]
+    fn rejects_legacy_json() {
+        let sha = sha256_hex(b"ca");
+        let legacy =
+            br#"{"schema":"kca-ocsp-status/v2","issuer":{"id":"ca","sha256":"sha"},"entries":[]}"#;
+        assert!(matches!(
+            Snapshot::parse(legacy, &sha, "ca"),
+            Err(SnapshotError::Cbor(_))
+        ));
     }
 
     #[test]
diff --git a/ocsp-responder/src/store.rs b/ocsp-responder/src/store.rs
index b957e2d..1ff34a5 100644
--- a/ocsp-responder/src/store.rs
+++ b/ocsp-responder/src/store.rs
@@ -133,13 +133,14 @@ mod tests {
             prefix: format!("ocsp:test:{}", std::process::id()),
             ..Default::default()
         };
-        let key = config.key("round-trip");
+        let key = config.key("ca");
+        let sha = crate::snapshot::sha256_hex(b"ca");
         let store = StatusStore::new(&config).await.unwrap();
         let client = redis::Client::open(config.url.as_str()).unwrap();
         let mut connection = client.get_connection_manager().await.unwrap();
         let _: () = redis::cmd("SET")
             .arg(&key)
-            .arg("snapshot")
+            .arg(crate::snapshot::test_body(&sha))
             .arg("EX")
             .arg(30)
             .query_async(&mut connection)
@@ -149,7 +150,8 @@ mod tests {
         let stored = store.get(&key).await.unwrap();
         match stored {
             StoredSnapshot::Present { body, expires_at } => {
-                assert_eq!(body, Bytes::from_static(b"snapshot"));
+                let snapshot = crate::snapshot::Snapshot::parse(&body, &sha, "ca").unwrap();
+                assert_eq!(snapshot.entries.len(), 1);
                 assert!(expires_at > SystemTime::now());
             }
             StoredSnapshot::Missing => panic!("snapshot should be present"),
diff --git a/server/.env.example b/server/.env.example
index 3239e4b..f90cef4 100644
--- a/server/.env.example
+++ b/server/.env.example
@@ -66,7 +66,7 @@ OTEL_EXCLUDED_PATHS=/api/health
 #OTEL_METRICS_POLL_INTERVAL_SECONDS=15
 
 # --- OCSP status publisher (optional) --------------------------------------
-# When REDIS_URL is configured, KCA publishes one full JSON status snapshot
+# When REDIS_URL is configured, KCA publishes one full CBOR status snapshot
 # per CA to the same Redis instance and logical database used for sessions.
 # Keys use a separate prefix and expire unless refreshed by the heartbeat.
 KCA_OCSP_REDIS_PREFIX=ocsp
diff --git a/server/packages/kca-app/pyproject.toml b/server/packages/kca-app/pyproject.toml
index 41b8535..ee2241f 100644
--- a/server/packages/kca-app/pyproject.toml
+++ b/server/packages/kca-app/pyproject.toml
@@ -26,6 +26,7 @@ dependencies = [
     "PyYAML",
     "redis",
     "cryptography>=44",
+    "cbor2",
     "pyOpenSSL>=25",
     "paramiko>=3.5",
 ]
diff --git a/server/packages/kca-app/src/kca/ocsp.py b/server/packages/kca-app/src/kca/ocsp.py
index e42a35a..ca76f45 100644
--- a/server/packages/kca-app/src/kca/ocsp.py
+++ b/server/packages/kca-app/src/kca/ocsp.py
@@ -1,19 +1,19 @@
 """Per-CA OCSP status snapshots and Redis publication.
 
 KCA is the source of truth for certificate status. This module builds a
-compact JSON document per CA and stores it in the same Redis instance used for
+compact CBOR document per CA and stores it in the same Redis instance used for
 sessions, so the standalone OCSP responder never needs database access or a CA
 private key.
 """
 from __future__ import annotations
 
 import asyncio
-import json
 import logging
 from datetime import datetime, timedelta, timezone
 from typing import Any, Awaitable, Callable, Dict, Optional
 from uuid import UUID
 
+import cbor2
 from kaya.core import KayaApp, KayaMixin
 from redis.asyncio import Redis
 from tortoise.expressions import Q
@@ -92,7 +92,7 @@ async def publish_snapshot(
     """Store one CA snapshot with an expiry and return its Redis key."""
     if snapshot is None:
         snapshot = await snapshot_for_ca(ca)
-    body = json.dumps(snapshot, indent=2, sort_keys=True).encode("utf-8")
+    body = cbor2.dumps(snapshot)
     key = redis_key(str(ca.id))
 
     owned_client = None
diff --git a/server/tests/test_routes_extra.py b/server/tests/test_routes_extra.py
index ab7e707..ec65615 100644
--- a/server/tests/test_routes_extra.py
+++ b/server/tests/test_routes_extra.py
@@ -1216,6 +1216,7 @@ class OcspSnapshotTests(unittest.TestCase):
 
     @async_test
     async def test_publisher_marks_dirty_and_uploads(self) -> None:
+        import cbor2
         from dataclasses import replace
         from unittest.mock import patch
 
@@ -1252,8 +1253,9 @@ class OcspSnapshotTests(unittest.TestCase):
                 assert len(fake.calls) == 1
                 call = fake.calls[0]
                 assert call["name"] == f"ocsp:{ca['id']}"
-                assert b"kca-ocsp-status/v2" in call["value"]
-                assert b"generated_at" not in call["value"]
+                published = cbor2.loads(call["value"])
+                assert published["schema"] == "kca-ocsp-status/v2"
+                assert "generated_at" not in published
                 assert call["ex"] == 60
                 row = await OcspSnapshot.get(ca_id=ca["id"])
                 assert row.dirty is False
@@ -1334,7 +1336,7 @@ class OcspSnapshotTests(unittest.TestCase):
 
     @async_test
     async def test_imported_ca_cannot_overwrite_other_vault_snapshot(self) -> None:
-        import json
+        import cbor2
         from dataclasses import replace
         from unittest.mock import patch
 
@@ -1414,9 +1416,9 @@ class OcspSnapshotTests(unittest.TestCase):
         assert imported_key != target_key
         assert set(fake.objects) == {target_key, imported_key}
         assert fake.expiries == {target_key: 60, imported_key: 60}
-        target_snapshot = json.loads(fake.objects[target_key])
+        target_snapshot = cbor2.loads(fake.objects[target_key])
         target_entries = {entry["serial_hex"]: entry for entry in target_snapshot["entries"]}
         assert target_entries[leaf["serial_hex"].lower()]["status"] == "revoked"
-        imported_snapshot = json.loads(fake.objects[imported_key])
+        imported_snapshot = cbor2.loads(fake.objects[imported_key])
         imported_serials = {entry["serial_hex"] for entry in imported_snapshot["entries"]}
         assert leaf["serial_hex"].lower() not in imported_serials
diff --git a/server/uv.lock b/server/uv.lock
index 8b0444f..49260be 100644
--- a/server/uv.lock
+++ b/server/uv.lock
@@ -309,6 +309,78 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/e4/f8/972c96f5a2b6c4b3deca57009d93e946bbdbe2241dca9806d502f29dd3ee/bcrypt-5.0.0-pp311-pypy311_pp73-manylinux_2_34_x86_64.whl", hash = "sha256:6b8f520b61e8781efee73cba14e3e8c9556ccfb375623f4f97429544734545b4", size = 273375, upload-time = "2025-09-25T19:50:45.43Z" },
 ]
 
+[[package]]
+name = "cbor2"
+version = "6.1.5"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/39/34/d443914ea562a985ccb357682e17b7190d5d58eff797c741379be47a8f31/cbor2-6.1.5.tar.gz", hash = "sha256:6eb06160c42315ac0c4ded461c7d84d92fa18c69d13d17fc1dfc1fae96580c95", size = 94232, upload-time = "2026-10-01T18:09:33.621Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/78/08/8bb3abca3820c20cd5efa51f0f37033f8bc514b4d6f38afb559257a4b17d/cbor2-6.1.5-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:519f3f0d0d9467091c678f4a19a31e1b8756c10bbd6294cb3f906092f3da1597", size = 416900, upload-time = "2026-10-01T18:07:47.646Z" },
+    { url = "https://files.pythonhosted.org/packages/89/7a/39d6a60076cd9ffda49cb6cfa87cb57fc8bb9fdc2bec1b7eb4e934bb2ab2/cbor2-6.1.5-cp310-cp310-manylinux_2_28_aarch64.whl", hash = "sha256:fe81e4ff1b6bab72856d020dab89d86d4dcfbe18af4ff3fe2f391e1b03d0793c", size = 460595, upload-time = "2026-10-01T18:07:50.116Z" },
+    { url = "https://files.pythonhosted.org/packages/a0/b5/40618405d7925149c59e4e2874c7247670ccb562ede141b4c3b46f826d02/cbor2-6.1.5-cp310-cp310-manylinux_2_28_x86_64.whl", hash = "sha256:1ebbc6e2d5ea8acf44cc2247d48ca4ccae724fcdb97eaa673903e2d87f0ffc5d", size = 468860, upload-time = "2026-10-01T18:07:51.915Z" },
+    { url = "https://files.pythonhosted.org/packages/3f/3d/e9dfa478e4964e741cf6a9c5a098644264d4e0f5bef18a51d3ec4e2610d3/cbor2-6.1.5-cp310-cp310-musllinux_1_2_aarch64.whl", hash = "sha256:4db32eefe9fc173939d114fb78e09f967e69627714ad2e3bca807d0ea9d386ad", size = 527958, upload-time = "2026-10-01T18:07:53.916Z" },
+    { url = "https://files.pythonhosted.org/packages/e0/39/13fa54e47a466414ea4a7b9d384b188539e869f6c2b57771b7e2f7429413/cbor2-6.1.5-cp310-cp310-musllinux_1_2_x86_64.whl", hash = "sha256:0fa113902a302c22429b32e2454251a8fd14b18204fdff647c869a54114c3ed1", size = 536415, upload-time = "2026-10-01T18:07:55.668Z" },
+    { url = "https://files.pythonhosted.org/packages/51/b7/f12c7b555ab56633c0285e10294d5ea8a1d6c3aba3699ca9a44b0d2d267b/cbor2-6.1.5-cp310-cp310-win32.whl", hash = "sha256:c87272763122be24213c7bb3d47750a3af034da8755fbd3fcb0694c1efb6c3e8", size = 285715, upload-time = "2026-10-01T18:07:57.406Z" },
+    { url = "https://files.pythonhosted.org/packages/72/2a/fcf9348216a376bd3607fdd15f46aec50e665deff677b936fccc77d931b7/cbor2-6.1.5-cp310-cp310-win_amd64.whl", hash = "sha256:994b09c578e9dd7c5687a9f151f545bde705d12e47427b5a78c9d6cc970187f5", size = 308357, upload-time = "2026-10-01T18:07:58.892Z" },
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+
 [[package]]
 name = "certifi"
 version = "2026.10.19"
@@ -989,6 +1061,7 @@ source = { editable = "packages/kca-app" }
 dependencies = [
     { name = "aerich" },
     { name = "asyncpg" },
+    { name = "cbor2" },
     { name = "cryptography" },
     { name = "granian" },
     { name = "httpx" },
@@ -1026,6 +1099,7 @@ dev = [
 requires-dist = [
     { name = "aerich" },
     { name = "asyncpg" },
+    { name = "cbor2" },
     { name = "cryptography", specifier = ">=44" },
     { name = "granian", specifier = ">=2.0" },
     { name = "httpx" },