diff --git a/deno.lock b/deno.lock
index 1e5899e..6c3a6d4 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,102 +1,72 @@
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+    "https://deno.land/std@0.221.0/http/negotiation.ts": "d06ef2958ca712a7dbe4538eed6a46abfa2b87f8e150b7c89d83a6055dabd7cc",
+    "https://deno.land/std@0.221.0/http/status.ts": "ed61b4882af2514a81aefd3245e8df4c47b9a8e54929a903577643d2d1ebf514",
+    "https://deno.land/std@0.224.0/testing/_test_suite.ts": "f10a8a6338b60c403f07a76f3f46bdc9f1e1a820c0a1decddeb2949f7a8a0546",
+    "https://deno.land/std@0.224.0/testing/bdd.ts": "3e4de4ff6d8f348b5574661cef9501b442046a59079e201b849d0e74120d476b",
+    "https://deno.land/x/gql@2.0.2/deps.ts": "e59f927d0cc8a01c44f1fa2cc5b74cebd54b1d3a2b6c75eee9572a50bea8b819",
+    "https://deno.land/x/gql@2.0.2/graphiql/markup.ts": "825b76ac088b3813c85da2061e4b4e59ae5f57e38761f66e8c941bbd65999afa",
+    "https://deno.land/x/gql@2.0.2/graphiql/render.ts": "cb6533c133485093940678221b9eee3fb8ca14f2ac0c7b364d24edd3a074c270",
+    "https://deno.land/x/gql@2.0.2/mod.ts": "425588ebc6565240fb3908147f43d6a0b9498d3605832b0a829f8f23af5c9f39",
+    "https://deno.land/x/gql@2.0.2/types.ts": "c9b933567b747ce041f6f0d3e9bba32d102af62ae17785fa0b97310407af8481",
+    "https://esm.sh/v135/cssfilter@0.0.10/denonext/cssfilter.mjs": "b2dec5f4b51c7574509f04305aa54e33f9de336d66eade79f05552312f18f40b",
+    "https://esm.sh/v135/xss@1.0.15/denonext/xss.mjs": "b8f597b39cbfc8b9f9b0d73b5b8bb46ee08dd7a9b7eadccb1b524ea54617b031",
+    "https://esm.sh/xss@1.0.15/": "0d8e27aed5ce31e760e17b57bbc6f95a0146751387a2be56d5263297d92ac387"
   }
 }
diff --git a/deps.ts b/deps.ts
index 7754b2e..03f95bc 100644
--- a/deps.ts
+++ b/deps.ts
@@ -1,3 +1,3 @@
-export { expect } from 'https://deno.land/std@0.210.0/expect/mod.ts'
-export { assertEquals } from 'https://deno.land/std@0.210.0/assert/assert_equals.ts'
-export { assertMatch } from 'https://deno.land/std@0.210.0/assert/assert_match.ts'
+export { assertEquals } from 'jsr:@std/assert@1.0.0/equals'
+export { assertMatch } from 'jsr:@std/assert@1.0.0/match'
+export { parseMediaType } from 'jsr:@std/media-types@1.0.1/parse-media-type'
diff --git a/e2e_test.ts b/e2e_test.ts
new file mode 100644
index 0000000..6676a07
--- /dev/null
+++ b/e2e_test.ts
@@ -0,0 +1,29 @@
+import { describe, it } from 'https://deno.land/std@0.224.0/testing/bdd.ts'
+import { makeFetch } from './mod.ts'
+import { GraphQLHTTP } from 'https://deno.land/x/gql@2.0.2/mod.ts'
+import { buildSchema } from 'npm:graphql@16.8.1'
+
+describe('e2e', () => {
+  it('should work with GraphQL', async () => {
+    const schema = buildSchema(`
+      type Query {
+        hello: String
+      }
+    `)
+
+    const handler = GraphQLHTTP({
+      schema,
+      rootValue: { hello: () => 'Hello World!' },
+    })
+
+    const fetch = makeFetch(handler)
+
+    const res = await fetch('/', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ query: '{hello}' }),
+    })
+
+    res.expectBody({ data: { hello: 'Hello World!' } })
+  })
+})
diff --git a/mod.ts b/mod.ts
index 04eca42..d2a7250 100644
--- a/mod.ts
+++ b/mod.ts
@@ -1,4 +1,4 @@
-import { assertEquals, assertMatch } from './deps.ts'
+import { assertEquals, assertMatch, parseMediaType } from './deps.ts'
 import { Handler, HandlerOrListener } from './types.ts'
 
 // credit - 'https://deno.land/x/free_port@v1.2.0/mod.ts'
@@ -39,9 +39,11 @@ const fetchEndpoint = async (
   const res = await fetch(`http://localhost:${port}${url}`, params)
   let data: unknown
   const ct = res.headers.get('Content-Type')
-  if (ct === 'application/json') data = await res.json()
-  else if (ct?.includes('text')) data = await res.text()
-  else if (ct === null) data = await res.text()
+  if (ct === null) return { data: await res.text(), res }
+  const [mediaType] = parseMediaType(ct)
+
+  if (mediaType === 'application/json') data = await res.json()
+  else if (mediaType.includes('text')) data = await res.text()
   else data = await res.arrayBuffer()
   return { res, data }
 }
diff --git a/mod_test.ts b/mod_test.ts
index 8068c21..7ce2ce6 100644
--- a/mod_test.ts
+++ b/mod_test.ts
@@ -1,8 +1,8 @@
-import { describe, it } from 'https://deno.land/std@0.210.0/testing/bdd.ts'
-import { expect } from './deps.ts'
+import { describe, it } from 'https://deno.land/std@0.224.0/testing/bdd.ts'
+import { expect } from 'jsr:@std/expect@0.224.5/expect'
 import { makeFetch } from './mod.ts'
 import { Handler } from './types.ts'
-import { AssertionError } from 'https://deno.land/std@0.210.0/assert/assertion_error.ts'
+import { AssertionError } from 'jsr:@std/assert@1.0.0/assertion-error'
 
 // this simulates the listener
 class PseudoListener {
@@ -23,7 +23,7 @@ class PseudoListener {
     this.rid = this.#listener.rid
   }
 
-  fetchRandomPort = () => {
+  fetchRandomPort() {
     return Math.round(Math.random() * (9000 - 2000)) + 2000
   }
 
@@ -53,6 +53,18 @@ describe('makeFetch', () => {
 
     res.expect('Hello World')
   })
+  it('should not crash with text/plain', async () => {
+    const handler: Handler = () =>
+      new Response('Hello World', {
+        headers: {
+          'Content-Type': 'text/plain;charset=UTF-8',
+        },
+      })
+    const fetch = makeFetch(handler)
+    const res = await fetch('/')
+
+    res.expect('Hello World')
+  })
   it('should parse JSON if response is JSON', async () => {
     const handler: Handler = () =>
       new Response(JSON.stringify({ hello: 'world' }), {