diff --git a/rust/tool/shared/src/utils.rs b/rust/tool/shared/src/utils.rs
index 4ca649cf..11ffa6b4 100644
--- a/rust/tool/shared/src/utils.rs
+++ b/rust/tool/shared/src/utils.rs
@@ -34,6 +34,7 @@ impl SecureTempDirExt for TempDir {
     fn create_secure_file(&self, path: &Path) -> Result<fs::File> {
         fs::OpenOptions::new()
             .create(true)
+            .truncate(true)
             .write(true)
             .mode(0o600)
             .open(path)
diff --git a/rust/tool/systemd/src/architecture.rs b/rust/tool/systemd/src/architecture.rs
index 173f1483..fdf61de9 100644
--- a/rust/tool/systemd/src/architecture.rs
+++ b/rust/tool/systemd/src/architecture.rs
@@ -4,15 +4,10 @@ use lanzaboote_tool::architecture::Architecture;
 
 /// Systemd-specific architecture helpers
 pub trait SystemdArchitectureExt {
-    fn systemd_stub_filename(&self) -> PathBuf;
     fn systemd_filename(&self) -> PathBuf;
 }
 
 impl SystemdArchitectureExt for Architecture {
-    fn systemd_stub_filename(&self) -> PathBuf {
-        format!("linux{}.efi.stub", self.efi_representation()).into()
-    }
-
     fn systemd_filename(&self) -> PathBuf {
         format!("systemd-boot{}.efi", self.efi_representation()).into()
     }
diff --git a/rust/tool/systemd/tests/common/mod.rs b/rust/tool/systemd/tests/common/mod.rs
index 5fb09a09..08946cc5 100644
--- a/rust/tool/systemd/tests/common/mod.rs
+++ b/rust/tool/systemd/tests/common/mod.rs
@@ -20,7 +20,6 @@ use sha2::{Digest, Sha256};
 use tempfile::TempDir;
 
 use lanzaboote_tool::architecture::Architecture;
-use lzbt_systemd::architecture::SystemdArchitectureExt;
 
 /// Returns the host platform system
 /// in the system double format for
@@ -98,7 +97,7 @@ pub fn setup_generation_link_from_toplevel(
 /// Accepts the temporary directory as a parameter so that the invoking function retains control of
 /// it (and when it goes out of scope).
 pub fn setup_toplevel(tmpdir: &Path) -> Result<PathBuf> {
-    let system = Architecture::from_nixos_system(SYSTEM)?;
+    let architecture = Architecture::from_nixos_system(SYSTEM)?;
 
     // Generate a random toplevel name so that multiple toplevel paths can live alongside each
     // other in the same directory.
@@ -107,7 +106,7 @@ pub fn setup_toplevel(tmpdir: &Path) -> Result<PathBuf> {
     fs::create_dir_all(&fake_store_path)?;
 
     let test_systemd = systemd_location_from_env()?;
-    let systemd_stub_filename = system.systemd_stub_filename();
+    let systemd_stub_filename = systemd_stub_filename(&architecture);
     let test_systemd_stub = format!(
         "{test_systemd}/lib/systemd/boot/efi/{systemd_stub_filename}",
         systemd_stub_filename = systemd_stub_filename.display()
@@ -146,9 +145,9 @@ pub fn lanzaboote_install(
 ) -> Result<Output> {
     // To simplify the test setup, we use the systemd stub here instead of the lanzaboote stub. See
     // the comment in setup_toplevel for details.
-    let system = Architecture::from_nixos_system(SYSTEM)?;
+    let architecture = Architecture::from_nixos_system(SYSTEM)?;
     let test_systemd = systemd_location_from_env()?;
-    let systemd_stub_filename = system.systemd_stub_filename();
+    let systemd_stub_filename = systemd_stub_filename(&architecture);
     let test_systemd_stub = format!(
         "{test_systemd}/lib/systemd/boot/efi/{systemd_stub_filename}",
         systemd_stub_filename = systemd_stub_filename.display()
@@ -259,3 +258,7 @@ pub fn image_path(esp: &TempDir, version: u64, toplevel: &Path) -> Result<PathBu
         "EFI/Linux/nixos-generation-{version}-{stub_input_hash}.efi"
     )))
 }
+
+fn systemd_stub_filename(architecture: &Architecture) -> PathBuf {
+    format!("linux{}.efi.stub", architecture.efi_representation()).into()
+}
diff --git a/rust/uefi/rust-toolchain.toml b/rust/uefi/rust-toolchain.toml
index 6db27e04..50ba0d51 100644
--- a/rust/uefi/rust-toolchain.toml
+++ b/rust/uefi/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.75.0"
+channel = "1.78.0"
 components = [ "rust-src" ]
 targets = [ "x86_64-unknown-uefi", "aarch64-unknown-uefi" ]