diff --git a/Cargo.toml b/Cargo.toml
index 231f65e..989db67 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,9 +10,7 @@ documentation = "https://docs.rs/gamedig/latest/gamedig/"
 repository = "https://github.com/CosminPerRam/rust-gamedig"
 readme = "README.md"
 keywords = ["server", "query", "game", "check", "status"]
-
-[package.metadata]
-msrv = "1.58.1"
+rust-version = "1.56.1"
 
 [dependencies]
 bzip2-rs = "0.1.2" # for compression
diff --git a/examples/minecraft.rs b/examples/minecraft.rs
index f675508..ad1b98e 100644
--- a/examples/minecraft.rs
+++ b/examples/minecraft.rs
@@ -6,7 +6,7 @@ fn main() {
     let response = mc::query("127.0.0.1", None);
 
     match response {
-        Err(error) => println!("Couldn't query, error: {error}"),
+        Err(error) => println!("Couldn't query, error: {}", error),
         Ok(r) => println!("{:#?}", r)
     }
 }
diff --git a/examples/tf2.rs b/examples/tf2.rs
index f901d01..8a612c9 100644
--- a/examples/tf2.rs
+++ b/examples/tf2.rs
@@ -4,7 +4,7 @@ use gamedig::games::tf2;
 fn main() {
     let response = tf2::query("127.0.0.1", None); //or Some(27015), None is the default protocol port (which is 27015)
     match response {
-        Err(error) => println!("Couldn't query, error: {error}"),
+        Err(error) => println!("Couldn't query, error: {}", error),
         Ok(r) => println!("{:#?}", r)
     }
 }
diff --git a/src/protocols/valve/protocol.rs b/src/protocols/valve/protocol.rs
index 3d5ba45..80dbb25 100644
--- a/src/protocols/valve/protocol.rs
+++ b/src/protocols/valve/protocol.rs
@@ -433,7 +433,7 @@ fn get_response(address: &str, port: u16, app: App, gather_settings: GatheringSe
     if let App::Source(source_app) = &app {
         if let Some(appid) = source_app {
             if *appid != info.appid {
-                return Err(BadGame(format!("AppId: {appid}")));
+                return Err(BadGame(format!("AppId: {}", appid)));
             }
         }
     }