diff --git a/scrapypuppeteer/response.py b/scrapypuppeteer/response.py
index 942b2d0..cb032ef 100644
--- a/scrapypuppeteer/response.py
+++ b/scrapypuppeteer/response.py
@@ -53,6 +53,7 @@ def __init__(self, url, puppeteer_request, context_id, page_id, **kwargs):
         self.cookies = kwargs.pop('cookies')
         kwargs.setdefault('body', self.html)
         kwargs.setdefault('encoding', 'utf-8')
+        kwargs.setdefault('headers', {}).setdefault('Content-Type', 'text/html')
         super().__init__(url, puppeteer_request, context_id, page_id, **kwargs)
 
 
@@ -64,7 +65,8 @@ class PuppeteerJsonResponse(PuppeteerResponse):
 
     def __init__(self, url, puppeteer_request, context_id, page_id, **kwargs):
         self.data = kwargs
-        super().__init__(url, puppeteer_request, context_id, page_id)
+        headers = {'Content-Type': 'application/json'}
+        super().__init__(url, puppeteer_request, context_id, page_id, headers=headers)
 
 
 class PuppeteerScreenshotResponse(PuppeteerResponse):
diff --git a/setup.py b/setup.py
index 8830d67..ef58b15 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 setup(
     name='scrapy-puppeteer-client',
-    version='0.0.5',
+    version='0.0.6',
     description='A library to use Puppeteer-managed browser in Scrapy spiders',
     long_description=long_description,
     long_description_content_type="text/markdown",