diff --git a/node_modules/mem/package.json b/node_modules/mem/package.json
index dba9edb686..fb51546095 100644
--- a/node_modules/mem/package.json
+++ b/node_modules/mem/package.json
@@ -37,10 +37,10 @@
     "mimic-fn": "^3.0.0"
   },
   "devDependencies": {
-    "ava": "^2.4.0",
+    "ava": "^4.0.0",
     "delay": "^4.1.0",
-    "serialize-javascript": "^2.1.0",
-    "tsd": "^0.11.0",
-    "xo": "^0.25.3"
+    "serialize-javascript": "^3.1.0",
+    "tsd": "^0.17.0",
+    "xo": "^0.42.0"
   }
 }
\ No newline at end of file