diff --git a/package.json b/package.json
index 2459dd1..1a64a60 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "monocle-ts": "^2.3.11",
     "oaf-side-effects": "^3.1.0",
     "total-functions": "^3.0.0",
-    "ts-essentials": "^8.1.0",
+    "ts-essentials": "^9.0.0",
     "type-zoo": "^3.4.1"
   },
   "prettier": {
diff --git a/yarn.lock b/yarn.lock
index ee0c5fc..faa3e66 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4147,10 +4147,10 @@ tree-kill@~1.2.2:
   resolved "https://registry.yarnpkg.com/tree-kill/-/tree-kill-1.2.2.tgz#4ca09a9092c88b73a7cdc5e8a01b507b0790a0cc"
   integrity sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==
 
-ts-essentials@^8.1.0:
-  version "8.1.0"
-  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-8.1.0.tgz#bc982b242db226b84c89477d3d42630ee2954513"
-  integrity sha512-34xALeQADWRYq9kbtprP4KdpTQ3v3BBIs/U4SpaP+C4++B8ijXY5NnILRJLchQVMzw7YBzKuGMUMrI9uT+ALVw==
+ts-essentials@^9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-9.0.0.tgz#6196b7f390926429256c70951c8edd260e8e5097"
+  integrity sha512-pow5YBSknf/PyoDhr8vsb93+hZah/jSzhdHA3GMjSzUuZIDZH+rV7tvN5DCbN4hi7QJXdteDv8D9HdDCSwXBUw==
 
 ts-jest@^27.0.5:
   version "27.0.5"