diff --git a/actix-protobuf/CHANGES.md b/actix-protobuf/CHANGES.md
index 8b88dc423..789133f17 100644
--- a/actix-protobuf/CHANGES.md
+++ b/actix-protobuf/CHANGES.md
@@ -1,6 +1,8 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Added `application/x-protobuf` as an acceptable header.
+- Updated `prost` dependency to `0.11`.
 
 
 ## 0.8.0 - 2022-06-25
diff --git a/actix-protobuf/Cargo.toml b/actix-protobuf/Cargo.toml
index 6a5d3a44a..b55796e7c 100644
--- a/actix-protobuf/Cargo.toml
+++ b/actix-protobuf/Cargo.toml
@@ -20,8 +20,8 @@ path = "src/lib.rs"
 actix-web = { version = "4", default_features = false }
 derive_more = "0.99.5"
 futures-util = { version = "0.3.7", default-features = false }
-prost = { version = "0.10", default_features = false }
+prost = { version = "0.11", default_features = false }
 
 [dev-dependencies]
 actix-web = { version = "4", default_features = false, features = ["macros"] }
-prost = { version = "0.10", default_features = false, features = ["prost-derive"] }
+prost = { version = "0.11", default_features = false, features = ["prost-derive"] }
diff --git a/actix-protobuf/src/lib.rs b/actix-protobuf/src/lib.rs
index 8f13f9c8f..f7a8bedcb 100644
--- a/actix-protobuf/src/lib.rs
+++ b/actix-protobuf/src/lib.rs
@@ -172,7 +172,9 @@ pub struct ProtoBufMessage<T: Message + Default> {
 impl<T: Message + Default> ProtoBufMessage<T> {
     /// Create `ProtoBufMessage` for request.
     pub fn new(req: &HttpRequest, payload: &mut Payload) -> Self {
-        if req.content_type() != "application/protobuf" {
+        if req.content_type() != "application/protobuf"
+            && req.content_type() != "application/x-protobuf"
+        {
             return ProtoBufMessage {
                 limit: 262_144,
                 length: None,