diff --git a/types/webpack-chain/index.d.ts b/types/webpack-chain/index.d.ts
index 033ef9951f..d821d13417 100644
--- a/types/webpack-chain/index.d.ts
+++ b/types/webpack-chain/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for webpack-chain 4.8
+// Type definitions for webpack-chain 5.0
 // Project: https://github.com/mozilla-neutrino/webpack-chain
 // Definitions by: Eirikur Nilsson <https://github.com/eirikurn>, Paul Sachs <https://github.com/psachs21>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -209,7 +209,7 @@ declare namespace Config {
 		flagIncludedChunks(value: boolean): this;
 		mergeDuplicateChunks(value: boolean): this;
 		minimize(value: boolean): this;
-		minimizer(value: webpack.Plugin[]): this;
+		minimizer(name: string): Plugin<this>;
 		namedChunks(value: boolean): this;
 		namedModules(value: boolean): this;
 		nodeEnv(value: boolean | string): this;
diff --git a/types/webpack-chain/webpack-chain-tests.ts b/types/webpack-chain/webpack-chain-tests.ts
index f1d0daa5e2..b655df07ea 100644
--- a/types/webpack-chain/webpack-chain-tests.ts
+++ b/types/webpack-chain/webpack-chain-tests.ts
@@ -173,7 +173,9 @@ config
 		.flagIncludedChunks(true)
 		.mergeDuplicateChunks(true)
 		.minimize(true)
-		.minimizer([])
+		.minimizer('foo')
+			.use(webpack.DefinePlugin)
+			.end()
 		.namedChunks(true)
 		.namedModules(true)
 		.nodeEnv(true)