diff --git a/package.json b/package.json
index 646ca19..916830e 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "rollup": "^1.0.0",
     "sanctuary-scripts": "^2.0.0",
     "sanctuary-show": "^1.0.0",
-    "sanctuary-type-classes": "^9.0.0",
+    "sanctuary-type-classes": "^10.0.0",
     "sinon": "^7.1.0"
   }
 }