diff --git a/config/webpack/production.js b/config/webpack/production.js
index bceffaf5c..f2f216422 100644
--- a/config/webpack/production.js
+++ b/config/webpack/production.js
@@ -87,7 +87,7 @@ module.exports = merge(sharedConfig, {
         '**/*.woff',
       ],
       ServiceWorker: {
-        entry: `imports-loader?ATTACHMENT_HOST=>${encodeURIComponent(JSON.stringify(attachmentHost))}!${encodeURI(path.join(__dirname, '../../app/javascript/mastodon/service_worker/entry.js'))}`,
+        entry: `imports-loader?additionalCode=${encodeURIComponent(`var ATTACHMENT_HOST=${JSON.stringify(attachmentHost)};`)}!${encodeURI(path.join(__dirname, '../../app/javascript/mastodon/service_worker/entry.js'))}`,
         cacheName: 'mastodon',
         output: '../assets/sw.js',
         publicPath: '/sw.js',
diff --git a/package.json b/package.json
index abe4d778c..457e414d2 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,7 @@
     "history": "^4.10.1",
     "http-link-header": "^1.0.2",
     "immutable": "^3.8.2",
-    "imports-loader": "^0.8.0",
+    "imports-loader": "^1.1.0",
     "intersection-observer": "^0.11.0",
     "intl": "^1.2.5",
     "intl-messageformat": "^2.2.0",
diff --git a/yarn.lock b/yarn.lock
index 9a5b2d5a0..4088b37a7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5527,13 +5527,15 @@ import-local@^3.0.2:
     pkg-dir "^4.2.0"
     resolve-cwd "^3.0.0"
 
-imports-loader@^0.8.0:
-  version "0.8.0"
-  resolved "https://registry.yarnpkg.com/imports-loader/-/imports-loader-0.8.0.tgz#030ea51b8ca05977c40a3abfd9b4088fe0be9a69"
-  integrity sha512-kXWL7Scp8KQ4552ZcdVTeaQCZSLW+e6nJfp3cwUMB673T7Hr98Xjx5JK+ql7ADlJUvj1JS5O01RLbKoutN5QDQ==
+imports-loader@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/imports-loader/-/imports-loader-1.1.0.tgz#1c3a388d0c5cd7f9eb08f3646d4aae3b70e57933"
+  integrity sha512-HcPM6rULdQ6EBLVq+5O+CF9xb7qiUjsRm6V28bTG/c3IU5sQkVZzUDwYY0r4jHvSAmVFdO9WA/vLAURR5WQSeQ==
   dependencies:
-    loader-utils "^1.0.2"
+    loader-utils "^2.0.0"
+    schema-utils "^2.7.0"
     source-map "^0.6.1"
+    strip-comments "^2.0.1"
 
 imurmurhash@^0.1.4:
   version "0.1.4"
@@ -6778,7 +6780,7 @@ loader-utils@0.2.x:
     json5 "^0.5.0"
     object-assign "^4.0.1"
 
-loader-utils@^1.0.2, loader-utils@^1.1.0, loader-utils@^1.2.3, loader-utils@^1.4.0:
+loader-utils@^1.1.0, loader-utils@^1.2.3, loader-utils@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-1.4.0.tgz#c579b5e34cb34b1a74edc6c1fb36bfa371d5a613"
   integrity sha512-qH0WSMBtn/oHuwjy/NucEgbx5dbxxnxup9s4PVXJUDHZBQY+s0NWA9rJf53RBnQZxfch7euUui7hpoAPvALZdA==
@@ -10210,6 +10212,11 @@ strip-bom@^4.0.0:
   resolved "https://registry.yarnpkg.com/strip-bom/-/strip-bom-4.0.0.tgz#9c3505c1db45bcedca3d9cf7a16f5c5aa3901878"
   integrity sha512-3xurFv5tEgii33Zi8Jtp55wEIILR9eh34FAW00PZf+JnSsTmV/ioewSgQl97JHvgjoRGwPShsWm+IdrxB35d0w==
 
+strip-comments@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/strip-comments/-/strip-comments-2.0.1.tgz#4ad11c3fbcac177a67a40ac224ca339ca1c1ba9b"
+  integrity sha512-ZprKx+bBLXv067WTCALv8SSz5l2+XhpYCsVtSqlMnkAXMWDq+/ekVbl1ghqP9rUHTzv6sm/DwCOiYutU/yp1fw==
+
 strip-eof@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"