diff --git a/constants.js b/constants.js
index 341bb70456..c908fccc04 100644
--- a/constants.js
+++ b/constants.js
@@ -262,6 +262,14 @@ const constants = {
     crrCascadeBlockedLocationTypes: ['location-scality-ring-s3-v1', 'location-scality-artesca-s3-v1'],
     // Supported attributes for the GetObjectAttributes 'x-amz-optional-attributes' header.
     supportedGetObjectAttributes: new Set(['StorageClass', 'ObjectSize', 'ObjectParts', 'Checksum', 'ETag']),
+    // Error names returned in CRR conflict responses of backbeat routes. They must
+    // match the exception names of @scality/cloudserverclient, which is kept out of
+    // runtime dependencies.
+    crrConflictErrors: {
+        VersionIdCollision: 'VersionIdCollisionException',
+        StaleMicroVersionId: 'StaleMicroVersionIdException',
+        MicroVersionIdAlreadyStored: 'MicroVersionIdAlreadyStoredException',
+    },
 };
 
 module.exports = constants;
diff --git a/lib/routes/routeBackbeat.js b/lib/routes/routeBackbeat.js
index 3cbbca50c7..dda267747d 100644
--- a/lib/routes/routeBackbeat.js
+++ b/lib/routes/routeBackbeat.js
@@ -12,11 +12,6 @@ const backbeatProxy = httpProxy.createProxyServer({
 });
 const { auth, errors, errorInstances, s3middleware, s3routes, models, storage, versioning } = require('arsenal');
 const { decode, encode } = versioning.VersionID;
-const {
-    VersionIdCollisionException,
-    StaleMicroVersionIdException,
-    MicroVersionIdAlreadyStoredException,
-} = require('@scality/cloudserverclient');
 
 const { responseJSONBody } = s3routes.routesUtils;
 const { getSubPartIds } = s3middleware.azureHelper.mpuUtils;
@@ -53,6 +48,7 @@ metadata.getObjectMDPromised = promisify(metadata.getObjectMD);
 metadata.getBucketAndObjectMDPromised = promisify(metadata.getBucketAndObjectMD);
 
 const { CURRENT_TYPE, NON_CURRENT_TYPE, ORPHAN_DM_TYPE } = constants.lifecycleListing;
+const { crrConflictErrors } = constants;
 
 const lifecycleTypeCalls = {
     [CURRENT_TYPE]: listLifecycleCurrents,
@@ -448,7 +444,7 @@ function putData(request, response, bucketInfo, objMd, log, callback) {
             response,
             log,
             callback,
-            VersionIdCollisionException.name,
+            crrConflictErrors.VersionIdCollision,
             'version id already at destination',
             objMd.microVersionId,
         );
@@ -605,12 +601,12 @@ function putMetadata(request, response, bucketInfo, objMd, log, callback) {
         let conflictErr = null;
         if (incomingMicroVersionId === objectMicroVersionId) {
             conflictErr = {
-                err: MicroVersionIdAlreadyStoredException.name,
+                err: crrConflictErrors.MicroVersionIdAlreadyStored,
                 message: 'incoming microVersionId already at destination',
             };
         } else if (isIncomingOlderThanCurrent(incomingMicroVersionId, objectMicroVersionId)) {
             conflictErr = {
-                err: StaleMicroVersionIdException.name,
+                err: crrConflictErrors.StaleMicroVersionId,
                 message: 'incoming revision is older than destination',
                 mvId: objMd?.microVersionId,
             };
@@ -1051,7 +1047,7 @@ function putMetadata(request, response, bucketInfo, objMd, log, callback) {
                         response,
                         log,
                         callback,
-                        StaleMicroVersionIdException.name,
+                        crrConflictErrors.StaleMicroVersionId,
                         'incoming revision is not newer than stored',
                         objMd?.microVersionId,
                     );
diff --git a/package.json b/package.json
index d51f7651d5..477f45a2e4 100644
--- a/package.json
+++ b/package.json
@@ -64,11 +64,11 @@
         "vaultclient": "scality/vaultclient#8.5.8",
         "werelogs": "scality/werelogs#semver:^8.2.4",
         "ws": "^8.18.0",
-        "@scality/cloudserverclient": "1.0.12",
         "xml2js": "^0.6.2"
     },
     "devDependencies": {
         "@eslint/compat": "^1.2.2",
+        "@scality/cloudserverclient": "1.0.12",
         "@scality/eslint-config-scality": "scality/Guidelines#8.3.1",
         "eslint": "^9.14.0",
         "eslint-plugin-import": "^2.31.0",
diff --git a/tests/unit/routes/routeBackbeat.js b/tests/unit/routes/routeBackbeat.js
index 2ecb23337f..c82a52513e 100644
--- a/tests/unit/routes/routeBackbeat.js
+++ b/tests/unit/routes/routeBackbeat.js
@@ -20,6 +20,8 @@ const bucketPutVersioning = require('../../../lib/api/bucketPutVersioning');
 const objectPut = require('../../../lib/api/objectPut');
 const { objectDelete } = require('../../../lib/api/objectDelete');
 const bucketPutPolicy = require('../../../lib/api/bucketPutPolicy');
+const cloudserverClient = require('@scality/cloudserverclient');
+const { crrConflictErrors } = require('../../../constants');
 
 const log = new DummyRequestLogger();
 
@@ -1654,3 +1656,15 @@ describe('routeBackbeat index add payload validation', () => {
         assert.strictEqual(metadata.putBucketIndexes.called, false);
     });
 });
+
+describe('routeBackbeat CRR conflict error names', () => {
+    [
+        ['VersionIdCollision', 'VersionIdCollisionException'],
+        ['StaleMicroVersionId', 'StaleMicroVersionIdException'],
+        ['MicroVersionIdAlreadyStored', 'MicroVersionIdAlreadyStoredException'],
+    ].forEach(([key, exception]) => {
+        it(`should match cloudserverclient ${exception} name`, () => {
+            assert.strictEqual(crrConflictErrors[key], cloudserverClient[exception].name);
+        });
+    });
+});