diff --git a/cave/src/activitypub/fetch.rs b/cave/src/activitypub/fetch.rs
index b1fb039..049bf3f 100644
--- a/cave/src/activitypub/fetch.rs
+++ b/cave/src/activitypub/fetch.rs
@@ -21,9 +21,9 @@ where
     let mut req = http::Request::builder()
         .uri(uri)
         .header("host", &host)
-        .header("content-type", "application/activity+json")
+        .header("content-type", super::MIME_TYPE)
+        .header("accept", super::MIME_TYPE)
         .header("date", httpdate::fmt_http_date(SystemTime::now()))
-        .header("accept", "application/activity+json, application/ld+json")
         .header("digest", digest_header)
         .body(vec![])?;
     SigningConfig::new(RsaSha256, private_key, key_id)
diff --git a/cave/src/activitypub/mod.rs b/cave/src/activitypub/mod.rs
index 5bf5090..a95d7ec 100644
--- a/cave/src/activitypub/mod.rs
+++ b/cave/src/activitypub/mod.rs
@@ -7,6 +7,8 @@ pub use error::Error;
 use std::collections::HashMap;
 use serde::{Deserialize, Serialize};
 
+const MIME_TYPE: &str = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"";
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Actor {
     #[serde(rename = "@context")]
diff --git a/cave/src/activitypub/send.rs b/cave/src/activitypub/send.rs
index 5344af1..dce0f0c 100644
--- a/cave/src/activitypub/send.rs
+++ b/cave/src/activitypub/send.rs
@@ -37,7 +37,8 @@ pub async fn send_raw(
         .method("POST")
         .uri(uri)
         .header("host", &host)
-        .header("content-type", "application/activity+json")
+        .header("content-type", super::MIME_TYPE)
+        .header("accept", super::MIME_TYPE)
         .header("date", httpdate::fmt_http_date(SystemTime::now()))
         .header("digest", digest_header)
         .body(body.as_ref().clone())