diff --git a/knip.ts b/knip.ts
index 4ca163218..dc4c2efe8 100644
--- a/knip.ts
+++ b/knip.ts
@@ -48,6 +48,8 @@ const config: KnipConfig = {
         'bin/.*',
       ],
       ignoreDependencies: [
+        // Knip thinks it can be a devDependency, but it's supposed to be in dependencies.
+        '@babel/runtime',
         // There's no ReScript plugin for Knip
         '@rescript/react',
         // The Babel plugin fails to detect it
diff --git a/spec/dummy/package.json b/spec/dummy/package.json
index cb075e748..b7a3688a5 100644
--- a/spec/dummy/package.json
+++ b/spec/dummy/package.json
@@ -7,22 +7,10 @@
   },
   "private": true,
   "dependencies": {
-    "@babel/core": "7.17.9",
-    "@babel/plugin-transform-runtime": "7.17.0",
-    "@babel/preset-env": "7",
-    "@babel/preset-react": "^7.10.4",
     "@babel/runtime": "7.17.9",
     "@hotwired/turbo-rails": "^8.0.4",
-    "@rescript/react": "^0.13.0",
-    "babel-loader": "8.2.4",
-    "babel-plugin-transform-react-remove-prop-types": "^0.4.24",
-    "compression-webpack-plugin": "9",
     "core-js": "3",
     "create-react-class": "^15.6.3",
-    "css-loader": "^6.5.1",
-    "expose-loader": "^1.0.3",
-    "file-loader": "^6.2.0",
-    "imports-loader": "^1.2.0",
     "jquery": "^3.5.1",
     "jquery-ujs": "^1.2.2",
     "lodash": "^4.17.4",
@@ -38,7 +26,26 @@
     "react-router-dom": "^5.2.0",
     "redux": "^4.0.1",
     "redux-thunk": "^2.2.0",
-    "regenerator-runtime": "^0.13.4",
+    "regenerator-runtime": "^0.13.4"
+  },
+  "devDependencies": {
+    "@babel/core": "7.17.9",
+    "@babel/plugin-transform-runtime": "7.17.0",
+    "@babel/preset-env": "7",
+    "@babel/preset-react": "^7.10.4",
+    "@pmmmwh/react-refresh-webpack-plugin": "^0.5.1",
+    "@rescript/react": "^0.13.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "@types/react-helmet": "^6.1.5",
+    "babel-loader": "8.2.4",
+    "babel-plugin-transform-react-remove-prop-types": "^0.4.24",
+    "compression-webpack-plugin": "9",
+    "css-loader": "^6.5.1",
+    "expose-loader": "^1.0.3",
+    "file-loader": "^6.2.0",
+    "imports-loader": "^1.2.0",
+    "react-refresh": "^0.11.0",
     "rescript": "^11.1.4",
     "sass": "^1.43.4",
     "sass-loader": "^12.3.0",
@@ -50,16 +57,9 @@
     "webpack": "5.72.0",
     "webpack-assets-manifest": "5",
     "webpack-cli": "4",
+    "webpack-dev-server": "^4.9.0",
     "webpack-merge": "5"
   },
-  "devDependencies": {
-    "@pmmmwh/react-refresh-webpack-plugin": "^0.5.1",
-    "@types/react": "^19.0.0",
-    "@types/react-dom": "^19.0.0",
-    "@types/react-helmet": "^6.1.5",
-    "react-refresh": "^0.11.0",
-    "webpack-dev-server": "^4.9.0"
-  },
   "browser": {
     "fs": false
   },