diff --git a/src/config.ts b/src/config.ts
deleted file mode 100644
index 1ddb953..0000000
--- a/src/config.ts
+++ /dev/null
@@ -1,46 +0,0 @@
-import yn from 'yn';
-import { Config, Env } from '@vercel/build-utils';
-
-export function configBool(
-	config: Config,
-	configName: string,
-	env: Env,
-	envName: string
-): boolean | undefined {
-	const configVal = config[configName];
-	if (typeof configVal === 'boolean') {
-		return configVal;
-	}
-
-	if (typeof configVal === 'string' || typeof configVal === 'number') {
-		const d = yn(configVal);
-		if (typeof d === 'boolean') {
-			return d;
-		}
-	}
-
-	const envVal = env[envName];
-	if (typeof envVal === 'string') {
-		const d = yn(envVal);
-		if (typeof d === 'boolean') {
-			return d;
-		}
-	}
-}
-
-export function configString(
-	config: Config,
-	configName: string,
-	env: Env,
-	envName: string
-): string | undefined {
-	const configVal = config[configName];
-	if (typeof configVal === 'string') {
-		return configVal;
-	}
-
-	const envVal = env[envName];
-	if (typeof envVal === 'string') {
-		return envVal;
-	}
-}
diff --git a/src/start-dev-server.ts b/src/start-dev-server.ts
index b96f80e..b6b1322 100644
--- a/src/start-dev-server.ts
+++ b/src/start-dev-server.ts
@@ -31,26 +31,8 @@ function isReadable(v: any): v is Readable {
 export const startDevServer: StartDevServer = async ({
 	entrypoint,
 	workPath,
-	config,
 	meta = {},
 }) => {
-	// @deprecated
-	const unstable =
-		configBool(
-			config,
-			'denoUnstable',
-			meta.buildEnv || {},
-			'DENO_UNSTABLE'
-		) || false;
-
-	// @deprecated
-	const denoTsConfig = configString(
-		config,
-		'tsconfig',
-		meta.buildEnv || {},
-		'DENO_TSCONFIG'
-	);
-
 	const portFile = join(
 		TMP,
 		`vercel-deno-port-${Math.random().toString(32).substring(2)}`
@@ -68,12 +50,6 @@ export const startDevServer: StartDevServer = async ({
 
 	const args = shebang.parse(await readFile(absEntrypoint, 'utf8'));
 
-	// @deprecated
-	if (unstable) {
-		console.log('DENO_UNSTABLE env var is deprecated');
-		args['--unstable'] = true;
-	}
-
 	// Flags that accept file paths are relative to the entrypoint in
 	// the source file, but `deno run` is executed at the root directory
 	// of the project, so the arguments need to be relativized to the root
@@ -89,12 +65,6 @@ export const startDevServer: StartDevServer = async ({
 		}
 	}
 
-	// @deprecated
-	if (denoTsConfig && !args['--config']) {
-		console.log('DENO_TSCONFIG env var is deprecated');
-		args['--config'] = denoTsConfig;
-	}
-
 	const argv = [
 		'run',
 		'--allow-all',