diff --git a/package.json b/package.json
index 11aa284..a2439a8 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   },
   "homepage": "https://github.com/esm-bundle/chai#readme",
   "devDependencies": {
-    "@rollup/plugin-commonjs": "^15.0.0",
+    "@rollup/plugin-commonjs": "15.0.0",
     "@rollup/plugin-node-resolve": "9.0.0",
     "chai": "4.2.0",
     "esm-bundle-scripts": "1.2.0"
diff --git a/yarn.lock b/yarn.lock
index 144fb13..c63778c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -567,6 +567,19 @@
   dependencies:
     "@types/node" ">= 8"
 
+"@rollup/plugin-commonjs@15.0.0":
+  version "15.0.0"
+  resolved "https://registry.yarnpkg.com/@rollup/plugin-commonjs/-/plugin-commonjs-15.0.0.tgz#690d15a9d54ba829db93555bff9b98ff34e08574"
+  integrity sha512-8uAdikHqVyrT32w1zB9VhW6uGwGjhKgnDNP4pQJsjdnyF4FgCj6/bmv24c7v2CuKhq32CcyCwRzMPEElaKkn0w==
+  dependencies:
+    "@rollup/pluginutils" "^3.1.0"
+    commondir "^1.0.1"
+    estree-walker "^2.0.1"
+    glob "^7.1.6"
+    is-reference "^1.2.1"
+    magic-string "^0.25.7"
+    resolve "^1.17.0"
+
 "@rollup/plugin-commonjs@^11.1.0":
   version "11.1.0"
   resolved "https://registry.yarnpkg.com/@rollup/plugin-commonjs/-/plugin-commonjs-11.1.0.tgz#60636c7a722f54b41e419e1709df05c7234557ef"
@@ -580,19 +593,6 @@
     magic-string "^0.25.2"
     resolve "^1.11.0"
 
-"@rollup/plugin-commonjs@^15.0.0":
-  version "15.0.0"
-  resolved "https://registry.yarnpkg.com/@rollup/plugin-commonjs/-/plugin-commonjs-15.0.0.tgz#690d15a9d54ba829db93555bff9b98ff34e08574"
-  integrity sha512-8uAdikHqVyrT32w1zB9VhW6uGwGjhKgnDNP4pQJsjdnyF4FgCj6/bmv24c7v2CuKhq32CcyCwRzMPEElaKkn0w==
-  dependencies:
-    "@rollup/pluginutils" "^3.1.0"
-    commondir "^1.0.1"
-    estree-walker "^2.0.1"
-    glob "^7.1.6"
-    is-reference "^1.2.1"
-    magic-string "^0.25.7"
-    resolve "^1.17.0"
-
 "@rollup/plugin-node-resolve@9.0.0":
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/@rollup/plugin-node-resolve/-/plugin-node-resolve-9.0.0.tgz#39bd0034ce9126b39c1699695f440b4b7d2b62e6"