diff --git a/crates/api_common/src/lib.rs b/crates/api_common/src/lib.rs
index fb0087f4c..78c443976 100644
--- a/crates/api_common/src/lib.rs
+++ b/crates/api_common/src/lib.rs
@@ -61,7 +61,7 @@ pub(crate) mod tests {
 
   #[test]
   fn test_federate_retry_sleep_duration() {
-    let s = |secs| Duration::from_secs(secs);
+    let s = Duration::from_secs;
     assert_eq!(s(1), federate_retry_sleep_duration(0));
     assert_eq!(s(2), federate_retry_sleep_duration(1));
     assert_eq!(s(4), federate_retry_sleep_duration(2));
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 9dcd88026..9539402df 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.6
-ARG RUST_VERSION=1.77
+ARG RUST_VERSION=1.76
 ARG CARGO_BUILD_FEATURES=default
 ARG RUST_RELEASE_MODE=debug