diff --git a/package.json b/package.json
index fd48e85bc..256678298 100755
--- a/package.json
+++ b/package.json
@@ -72,6 +72,7 @@
     "css-what": "^5.0.1",
     "trim-newlines": "^3.0.1",
     "clean-css": "^4.1.11",
+    "mem": "^4.0.0",
     "minimist": "^1.2.3",
     "normalize-url": "^4.5.1",
     "glob-parent": "^5.1.2"
diff --git a/yarn.lock b/yarn.lock
index e2115559b..ae7a32c29 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -14704,14 +14704,7 @@ media-typer@0.3.0:
   resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
   integrity sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g=
 
-mem@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/mem/-/mem-1.1.0.tgz#5edd52b485ca1d900fe64895505399a0dfa45f76"
-  integrity sha1-Xt1StIXKHZAP5kiVUFOZoN+kX3Y=
-  dependencies:
-    mimic-fn "^1.0.0"
-
-mem@^4.0.0, mem@^4.3.0:
+mem@^1.1.0, mem@^4.0.0, mem@^4.3.0:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/mem/-/mem-4.3.0.tgz#461af497bc4ae09608cdb2e60eefb69bff744178"
   integrity sha512-qX2bG48pTqYRVmDB37rn/6PT7LcR8T7oAX3bf99u1Tt1nzxYfxkgqDwUwolPlXweM0XzBOBFzSx4kfp7KP1s/w==