diff --git a/package-lock.json b/package-lock.json
index 8af4cda..35540f2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,6 +16,7 @@
         "@11ty/eleventy-plugin-inclusive-language": "^1.0.3",
         "@11ty/eleventy-plugin-rss": "^1.2.0",
         "@11ty/eleventy-plugin-syntaxhighlight": "^5.0.0",
+        "cross-env": "^7.0.3",
         "tailwindcss": "^3.0.23"
       },
       "devDependencies": {
@@ -2167,6 +2168,23 @@
         "@babel/types": "^7.6.1"
       }
     },
+    "node_modules/cross-env": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.3.tgz",
+      "integrity": "sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==",
+      "dependencies": {
+        "cross-spawn": "^7.0.1"
+      },
+      "bin": {
+        "cross-env": "src/bin/cross-env.js",
+        "cross-env-shell": "src/bin/cross-env-shell.js"
+      },
+      "engines": {
+        "node": ">=10.14",
+        "npm": ">=6",
+        "yarn": ">=1"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
diff --git a/package.json b/package.json
index 3a65faf..4214848 100644
--- a/package.json
+++ b/package.json
@@ -10,8 +10,8 @@
   "scripts": {
     "clean": "rimraf dist",
     "screenshots": "node ./config/scripts/generate-screenshots.mjs",
-    "dev:11ty": "eleventy --serve --watch",
-    "build:11ty": "eleventy",
+    "dev:11ty": "cross-env ELEVENTY_ENV=development eleventy --serve --watch",
+    "build:11ty": "cross-env ELEVENTY_ENV=production eleventy",
     "start": "run-p dev:*",
     "build": "run-s clean build:*"
   },
@@ -28,6 +28,7 @@
     "@11ty/eleventy-plugin-inclusive-language": "^1.0.3",
     "@11ty/eleventy-plugin-rss": "^1.2.0",
     "@11ty/eleventy-plugin-syntaxhighlight": "^5.0.0",
+    "cross-env": "^7.0.3",
     "tailwindcss": "^3.0.23"
   },
   "devDependencies": {