diff --git a/Cargo.lock b/Cargo.lock
index 2d52596..fd1fb58 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1456,6 +1456,7 @@ dependencies = [
  "nyquest-preset",
  "palc",
  "redb",
+ "rustversion",
  "sdgb-api",
  "serde_json",
  "snafu",
diff --git a/sdgb-cli/Cargo.toml b/sdgb-cli/Cargo.toml
index 18c8917..0776f6e 100644
--- a/sdgb-cli/Cargo.toml
+++ b/sdgb-cli/Cargo.toml
@@ -29,3 +29,4 @@ nyquest-preset = { version = "0.2.0", features = ["async"] }
 palc = { version = "0.0.1", features = ["derive"] }
 futures-util = { version = "0.3.31", optional = true }
 ctrlc = { version = "3.4.7", features = ["termination"] }
+rustversion = "1.0.21"
diff --git a/sdgb-cli/src/main.rs b/sdgb-cli/src/main.rs
index 6392933..f615a0e 100644
--- a/sdgb-cli/src/main.rs
+++ b/sdgb-cli/src/main.rs
@@ -220,7 +220,12 @@ async fn main() -> Result<(), Box<dyn snafu::Error>> {
                 .truncate(true)
                 .write(true)
                 .open("players.json")?;
-            file.lock()?;
+
+            #[rustversion::since(1.89)]
+            {
+                file.lock()?;
+            }
+
             let writer = BufWriter::new(file);
             serde_json::to_writer(writer, &user_ids)?;
             info!("dumped {} user id", user_ids.len());