diff --git a/packages/polyfills-loader/package.json b/packages/polyfills-loader/package.json
index 4421b6852..97cad10fa 100644
--- a/packages/polyfills-loader/package.json
+++ b/packages/polyfills-loader/package.json
@@ -60,7 +60,7 @@
     "resize-observer-polyfill": "^1.5.1",
     "shady-css-scoped-element": "^0.0.2",
     "systemjs": "^6.8.1",
-    "terser": "^5.5.1",
+    "terser": "^5.14.2",
     "whatwg-fetch": "^3.5.0"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 686353733..1438200e0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1303,11 +1303,33 @@
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.3.tgz#e45e384e4b8ec16bce2fd903af78450f6bf7ec98"
   integrity sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==
 
+"@jridgewell/gen-mapping@^0.3.0":
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/@jridgewell/gen-mapping/-/gen-mapping-0.3.2.tgz#c1aedc61e853f2bb9f5dfe6d4442d3b565b253b9"
+  integrity sha512-mh65xKQAzI6iBcFzwv28KVWSmCkdRBWoOh+bYQGW3+6OZvbbN3TqMGo5hqYxQniRcH9F2VZIoJCm4pa3BPDK/A==
+  dependencies:
+    "@jridgewell/set-array" "^1.0.1"
+    "@jridgewell/sourcemap-codec" "^1.4.10"
+    "@jridgewell/trace-mapping" "^0.3.9"
+
 "@jridgewell/resolve-uri@^3.0.3":
   version "3.0.5"
   resolved "https://registry.yarnpkg.com/@jridgewell/resolve-uri/-/resolve-uri-3.0.5.tgz#68eb521368db76d040a6315cdb24bf2483037b9c"
   integrity sha512-VPeQ7+wH0itvQxnG+lIzWgkysKIr3L9sslimFW55rHMdGu/qCQ5z5h9zq4gI8uBtqkpHhsF4Z/OwExufUCThew==
 
+"@jridgewell/set-array@^1.0.1":
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/@jridgewell/set-array/-/set-array-1.1.2.tgz#7c6cf998d6d20b914c0a55a91ae928ff25965e72"
+  integrity sha512-xnkseuNADM0gt2bs+BvhO0p78Mk762YnZdsuzFV018NoG1Sj1SCQvpSqa7XUaTam5vAGasABV9qXASMKnFMwMw==
+
+"@jridgewell/source-map@^0.3.2":
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/@jridgewell/source-map/-/source-map-0.3.2.tgz#f45351aaed4527a298512ec72f81040c998580fb"
+  integrity sha512-m7O9o2uR8k2ObDysZYzdfhb08VuEml5oWGiosa1VdaPZ/A6QyPkAJuwN0Q1lhULOf6B7MtQmHENS743hWtCrgw==
+  dependencies:
+    "@jridgewell/gen-mapping" "^0.3.0"
+    "@jridgewell/trace-mapping" "^0.3.9"
+
 "@jridgewell/sourcemap-codec@^1.4.10":
   version "1.4.11"
   resolved "https://registry.yarnpkg.com/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.11.tgz#771a1d8d744eeb71b6adb35808e1a6c7b9b8c8ec"
@@ -1321,6 +1343,14 @@
     "@jridgewell/resolve-uri" "^3.0.3"
     "@jridgewell/sourcemap-codec" "^1.4.10"
 
+"@jridgewell/trace-mapping@^0.3.9":
+  version "0.3.14"
+  resolved "https://registry.yarnpkg.com/@jridgewell/trace-mapping/-/trace-mapping-0.3.14.tgz#b231a081d8f66796e475ad588a1ef473112701ed"
+  integrity sha512-bJWEfQ9lPTvm3SneWwRFVLzrh6nhjwqw7TUFFBEMzwvg7t7PCDenf2lDwqo4NQXzdpgBXyFgDWnQA+2vkruksQ==
+  dependencies:
+    "@jridgewell/resolve-uri" "^3.0.3"
+    "@jridgewell/sourcemap-codec" "^1.4.10"
+
 "@lion/accordion@^0.7.2":
   version "0.7.3"
   resolved "https://registry.yarnpkg.com/@lion/accordion/-/accordion-0.7.3.tgz#d0e498b4efa1f79e569208798b69d17d4435705a"
@@ -1477,9 +1507,9 @@
     unist-util-visit "^2.0.3"
 
 "@mdjs/mdjs-preview@^0.5.3", "@mdjs/mdjs-preview@^0.5.5":
-  version "0.5.6"
-  resolved "https://registry.yarnpkg.com/@mdjs/mdjs-preview/-/mdjs-preview-0.5.6.tgz#837ac6274f818bfa025cecfb68e5cff8001f3ab3"
-  integrity sha512-PzHxFzKgocnziI1HHe2uMuYzgEcZlEOYS9QD33EekhW4kAo/ZjhGvxkhBXfkZldbXTZDWTPN5fvD8GTgoJmL2A==
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/@mdjs/mdjs-preview/-/mdjs-preview-0.5.7.tgz#06899fe537c302553ac9d1667fc6821765d02804"
+  integrity sha512-nJUAqrYvlmRRN6rgSDlsTzWO3QCVPLCkyUVL/gv+Zl6scqRzgeDCBfwGI4VIGRBlM7CysXp3TLM3E6axi1l+tQ==
   dependencies:
     "@lion/accordion" "^0.7.2"
     "@open-wc/scoped-elements" "^2.0.0"
@@ -11680,7 +11710,7 @@ source-map@^0.6.0, source-map@^0.6.1, source-map@~0.6.0, source-map@~0.6.1:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
 
-source-map@^0.7.3, source-map@~0.7.2:
+source-map@^0.7.3:
   version "0.7.3"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.7.3.tgz#5302f8169031735226544092e64981f751750383"
   integrity sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==
@@ -12231,14 +12261,14 @@ terser@^4.6.3:
     source-map "~0.6.1"
     source-map-support "~0.5.12"
 
-terser@^5.0.0, terser@^5.10.0, terser@^5.5.1:
-  version "5.12.1"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-5.12.1.tgz#4cf2ebed1f5bceef5c83b9f60104ac4a78b49e9c"
-  integrity sha512-NXbs+7nisos5E+yXwAD+y7zrcTkMqb0dEJxIGtSKPdCBzopf7ni4odPul2aechpV7EXNvOudYOX2bb5tln1jbQ==
+terser@^5.0.0, terser@^5.10.0, terser@^5.14.2:
+  version "5.14.2"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-5.14.2.tgz#9ac9f22b06994d736174f4091aa368db896f1c10"
+  integrity sha512-oL0rGeM/WFQCUd0y2QrWxYnq7tfSuKBiqTjRPWrRgB46WD/kiwHwF8T23z78H6Q6kGCuuHcPB+KULHRdxvVGQA==
   dependencies:
+    "@jridgewell/source-map" "^0.3.2"
     acorn "^8.5.0"
     commander "^2.20.0"
-    source-map "~0.7.2"
     source-map-support "~0.5.20"
 
 test-exclude@^6.0.0: