diff --git a/Cargo.lock b/Cargo.lock
index d521907..14eca7b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1599,9 +1599,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.42"
+version = "0.23.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c54fcab019b409d04215d3a17cb438fd7fbf192ee61461f20f4fe18704bc138"
+checksum = "0d41d731c7d2f962d1ccc364cec258de3c0e93b38c2fb3ba97ac74513048d634"
 dependencies = [
  "once_cell",
  "ring",
@@ -1623,9 +1623,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.103.13"
+version = "0.103.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61c429a8649f110dddef65e2a5ad240f747e85f7758a6bccc7e5777bd33f756e"
+checksum = "f3c3cf1d8b1e7d4927e2d154c3fcb02979afb9939629c62cd9048d4f07b60ac2"
 dependencies = [
  "ring",
  "rustls-pki-types",
diff --git a/src/index/vector.rs b/src/index/vector.rs
index 4d6e3df..8619b34 100644
--- a/src/index/vector.rs
+++ b/src/index/vector.rs
@@ -619,7 +619,6 @@ fn atomic_write(path: &std::path::Path, data: &[u8]) -> Result<()> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::f32;
 
     fn make_unit_vec(dims: usize, idx: usize) -> Vec<f32> {
         let mut v = vec![0.0f32; dims];