diff --git a/package.json b/package.json
index d1a43125..dec99cfa 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "ajv": "^6.12.3",
     "axios": "^0.19.2",
     "body-parser": "^1.19.0",
-    "cnc-tskit": "^0.20.0",
+    "cnc-tskit": "^0.26.0",
     "cookie-parser": "^1.4.5",
     "d3": "^5.16.0",
     "express": "^4.17.1",