diff --git a/cmd/hydroxide/main.go b/cmd/hydroxide/main.go
index 3f74404..9cd9030 100644
--- a/cmd/hydroxide/main.go
+++ b/cmd/hydroxide/main.go
@@ -32,7 +32,7 @@ import (
 	smtpbackend "github.com/emersion/hydroxide/smtp"
 )
 
-const defaultAPIEndpoint = "https://mail.protonmail.com/api"
+const defaultAPIEndpoint = "https://mail.proton.me/api"
 
 var (
 	debug       bool
@@ -42,7 +42,7 @@ var (
 func newClient() *protonmail.Client {
 	return &protonmail.Client{
 		RootURL:    apiEndpoint,
-		AppVersion: "web-mail@4.20.8",
+		AppVersion: "web-mail@5.0.2.3",
 		Debug:      debug,
 	}
 }
diff --git a/protonmail/protonmail.go b/protonmail/protonmail.go
index 775bff9..8093fb3 100644
--- a/protonmail/protonmail.go
+++ b/protonmail/protonmail.go
@@ -119,6 +119,8 @@ func (c *Client) newJSONRequest(method, path string, body interface{}) (*http.Re
 }
 
 func (c *Client) do(req *http.Request) (*http.Response, error) {
+	req.Header.Set("User-Agent", "Mozilla/5.0 (X11; Linux x86_64; rv:101.0) Gecko/20100101 Firefox/101.0")
+
 	httpClient := c.HTTPClient
 	if httpClient == nil {
 		httpClient = http.DefaultClient