diff --git a/packages/blockstore-s3/package.json b/packages/blockstore-s3/package.json
index 134f3244..9b7ebceb 100644
--- a/packages/blockstore-s3/package.json
+++ b/packages/blockstore-s3/package.json
@@ -70,6 +70,6 @@
     "aegir": "^42.2.3",
     "interface-blockstore-tests": "^6.0.0",
     "p-defer": "^4.0.0",
-    "sinon": "^17.0.1"
+    "sinon": "^18.0.0"
   }
 }
diff --git a/packages/datastore-s3/package.json b/packages/datastore-s3/package.json
index b2e6f90f..746cdaaa 100644
--- a/packages/datastore-s3/package.json
+++ b/packages/datastore-s3/package.json
@@ -71,6 +71,6 @@
     "aegir": "^42.2.3",
     "interface-datastore-tests": "^5.0.0",
     "p-defer": "^4.0.0",
-    "sinon": "^17.0.1"
+    "sinon": "^18.0.0"
   }
 }