diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index a6b25c9..6be2137 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -2670,7 +2670,7 @@
   " " Test for sending a raw message
   " let g:lspNotif = []
   " let s = "Content-Length: 62\r\n"
-  " let s ..= "Content-Type: application/vim-jsonrpc; charset=utf-8\r\n"
+  " let s ..= "Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n"
   " let s ..= "\r\n"
   " let s ..= '{"method":"echo","jsonrpc":"2.0","params":{"m":"raw-message"}}'
   " call ch_sendraw(ch, s)
diff --git a/src/testdir/test_channel_lsp.py b/src/testdir/test_channel_lsp.py
index 10b4fb4..dd107be 100644
--- a/src/testdir/test_channel_lsp.py
+++ b/src/testdir/test_channel_lsp.py
@@ -35,7 +35,7 @@
             v['id'] = msgid
         s = json.dumps(v)
         resp = "Content-Length: " + str(len(s)) + "\r\n"
-        resp += "Content-Type: application/vim-jsonrpc; charset=utf-8\r\n"
+        resp += "Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n"
         resp += "\r\n"
         resp += s
         if self.debug:
@@ -46,7 +46,7 @@
         v = 'wrong-payload'
         s = json.dumps(v)
         resp = "Content-Length: " + str(len(s)) + "\r\n"
-        resp += "Content-Type: application/vim-jsonrpc; charset=utf-8\r\n"
+        resp += "Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n"
         resp += "\r\n"
         resp += s
         self.request.sendall(resp.encode('utf-8'))
@@ -60,7 +60,7 @@
 
     def send_empty_payload(self):
         resp = "Content-Length: 0\r\n"
-        resp += "Content-Type: application/vim-jsonrpc; charset=utf-8\r\n"
+        resp += "Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n"
         resp += "\r\n"
         self.request.sendall(resp.encode('utf-8'))
 
@@ -71,7 +71,7 @@
         resp = "Host: abc.vim.org\r\n"
         resp += "User-Agent: Python\r\n"
         resp += "Accept-Language: en-US,en\r\n"
-        resp += "Content-Type: application/vim-jsonrpc; charset=utf-8\r\n"
+        resp += "Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n"
         resp += "Content-Length: " + str(len(s)) + "\r\n"
         resp += "\r\n"
         resp += s
@@ -93,7 +93,7 @@
         # test for sending the http header without length
         v = {'jsonrpc': '2.0', 'id': msgid, 'result': resp_dict}
         s = json.dumps(v)
-        resp = "Content-Type: application/vim-jsonrpc; charset=utf-8\r\n"
+        resp = "Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n"
         resp += "\r\n"
         resp += s
         self.request.sendall(resp.encode('utf-8'))