diff --git a/crabfit-backend/package.json b/crabfit-backend/package.json
index caf6b3e..cb16624 100644
--- a/crabfit-backend/package.json
+++ b/crabfit-backend/package.json
@@ -4,7 +4,7 @@
   "description": "API for Crabfit",
   "main": "index.js",
   "author": "Ben Grant",
-  "license": "MIT",
+  "license": "GPL-3.0-only",
   "private": true,
   "engines": {
     "node": ">=10.0.0"
diff --git a/crabfit-frontend/package.json b/crabfit-frontend/package.json
index 13c1904..597ca0c 100644
--- a/crabfit-frontend/package.json
+++ b/crabfit-frontend/package.json
@@ -2,6 +2,7 @@
   "name": "crabfit-frontend",
   "version": "1.0.0",
   "private": true,
+  "license": "GPL-3.0-only",
   "dependencies": {
     "@azure/msal-browser": "^2.14.2",
     "@emotion/react": "^11.1.5",