diff --git a/package.json b/package.json
index e8e9b164a..aad3a344b 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "broccoli-concat": "4.2.4",
     "broccoli-funnel": "3.0.3",
     "broccoli-merge-trees": "4.2.0",
-    "broccoli-uglify-sourcemap": "4.0.0",
+    "broccoli-uglify-sourcemap": "3.2.0",
     "chai": "4.2.0",
     "chai-dom": "1.8.2",
     "codemirror": "5.48.2",
diff --git a/yarn.lock b/yarn.lock
index ff476979f..41ea7635d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3636,23 +3636,7 @@ broccoli-templater@^2.0.1:
     rimraf "^2.6.2"
     walk-sync "^0.3.3"
 
-broccoli-uglify-sourcemap@4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/broccoli-uglify-sourcemap/-/broccoli-uglify-sourcemap-4.0.0.tgz#c5c5fbd9563cf0fe4c68c337bb61e98fe0697a3b"
-  integrity sha512-46yB4gw1Q3ALtBROY5QfKXNXxYK5uPSvER1OGjjh2t3piaipqBfuRXTzQZvmZ+Odr6/McY+J8XmxON4+lE1ukg==
-  dependencies:
-    async-promise-queue "^1.0.5"
-    broccoli-plugin "^4.0.3"
-    debug "^4.1.0"
-    lodash.defaultsdeep "^4.6.1"
-    matcher-collection "^2.0.1"
-    source-map-url "^0.4.0"
-    symlink-or-copy "^1.3.1"
-    terser "^5.3.0"
-    walk-sync "^2.2.0"
-    workerpool "^6.0.0"
-
-broccoli-uglify-sourcemap@^3.1.0:
+broccoli-uglify-sourcemap@3.2.0, broccoli-uglify-sourcemap@^3.1.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/broccoli-uglify-sourcemap/-/broccoli-uglify-sourcemap-3.2.0.tgz#d96f1d41f6c18e9a5d49af1a5ab9489cdcac1c6c"
   integrity sha512-kkkn8v7kXdWwnZNekq+3ILuTAGkZoaoEMUYCKoER5/uokuoyTjtdYLHaE7UxHkuPEuLfjvJYv21sCCePZ74/2g==
@@ -13113,15 +13097,6 @@ terser@^4.1.2, terser@^4.3.9:
     source-map "~0.6.1"
     source-map-support "~0.5.12"
 
-terser@^5.3.0:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-5.3.0.tgz#c481f4afecdcc182d5e2bdd2ff2dc61555161e81"
-  integrity sha512-XTT3D3AwxC54KywJijmY2mxZ8nJiEjBHVYzq8l9OaYuRFWeQNBwvipuzzYEP4e+/AVcd1hqG/CqgsdIRyT45Fg==
-  dependencies:
-    commander "^2.20.0"
-    source-map "~0.6.1"
-    source-map-support "~0.5.12"
-
 testem@3.2.0, testem@^3.2.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/testem/-/testem-3.2.0.tgz#9924481f6a3b23e350fa77bb251c64d801c4c9a7"