diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 6b43ec9aa..157b66f1a 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -28,7 +28,7 @@ jobs:
       with:
         out-type: Lcov
         args: '--avoid-cfg-tarpaulin'
-        version: '0.15.0'
+        version: '0.22.0'
 
 
     - name: Coveralls Upload
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 000000000..cccf9d925
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+indent_style = "Block"
diff --git a/src/lib.rs b/src/lib.rs
index a3656323a..461eab742 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -89,4 +89,4 @@ pub use self::server::{CoAPServer, Server};
 pub mod client;
 pub mod message;
 mod observer;
-pub mod server;
\ No newline at end of file
+pub mod server;
diff --git a/src/observer.rs b/src/observer.rs
index caf900177..ab002d1a7 100644
--- a/src/observer.rs
+++ b/src/observer.rs
@@ -149,7 +149,10 @@ impl Observer {
             let mut response2 = response.clone();
             response2.message.payload = resource.payload.clone();
             response2.message.set_observe_value(resource.sequence);
-            response2.message.header.set_type(MessageType::NonConfirmable);
+            response2
+                .message
+                .header
+                .set_type(MessageType::NonConfirmable);
             self.send_message(&register_address, &response2.message)
                 .await;
         }