diff --git a/changelog.md b/changelog.md
index 2a5db55..b65db92 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 2025-11-25 - 2.1.1 - fix(oci)
+Preserve raw manifest bytes for digest calculation and handle string/JSON manifest bodies in OCI registry
+
+- Preserve the exact bytes of the manifest payload when computing the sha256 digest to comply with the OCI spec and avoid mismatches caused by re-serialization.
+- Accept string request bodies (converted using UTF-8) and treat already-parsed JSON objects by re-serializing as a fallback.
+- Keep existing content-type fallback logic while ensuring accurate digest calculation prior to storing manifests.
+
 ## 2025-11-25 - 2.1.0 - feat(oci)
 Support configurable OCI token realm/service and centralize unauthorized responses
 
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 1095f69..8eaeef5 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartregistry',
-  version: '2.1.0',
+  version: '2.1.1',
   description: 'A composable TypeScript library implementing OCI, NPM, Maven, Cargo, Composer, PyPI, and RubyGems registries for building unified container and package registries'
 }
diff --git a/ts/oci/classes.ociregistry.ts b/ts/oci/classes.ociregistry.ts
index e7d7e49..07241f4 100644
--- a/ts/oci/classes.ociregistry.ts
+++ b/ts/oci/classes.ociregistry.ts
@@ -379,7 +379,18 @@ export class OciRegistry extends BaseRegistry {
       };
     }
 
-    const manifestData = Buffer.isBuffer(body) ? body : Buffer.from(JSON.stringify(body));
+    // Preserve raw bytes for accurate digest calculation
+    // Per OCI spec, digest must match the exact bytes sent by client
+    let manifestData: Buffer;
+    if (Buffer.isBuffer(body)) {
+      manifestData = body;
+    } else if (typeof body === 'string') {
+      // String body - convert directly without JSON transformation
+      manifestData = Buffer.from(body, 'utf-8');
+    } else {
+      // Body was already parsed as JSON object - re-serialize as fallback
+      manifestData = Buffer.from(JSON.stringify(body));
+    }
     const contentType = headers?.['content-type'] || headers?.['Content-Type'] || 'application/vnd.oci.image.manifest.v1+json';
 
     // Calculate manifest digest