diff --git a/Cargo.lock b/Cargo.lock
index bc40504..ab3f087 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -116,7 +116,7 @@ dependencies = [
 
 [[package]]
 name = "birli"
-version = "0.12.0"
+version = "0.13.0"
 dependencies = [
  "aoflagger_sys",
  "approx",
@@ -1054,9 +1054,9 @@ checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
 
 [[package]]
 name = "marlu"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87329073badac25c4d8d4d2544cbfdf389fefba069062d44e6b29ba0912db318"
+checksum = "6271f1b61a6dcfd248b1c3a2f8c49bd5b425abe2d2c970263a14390369eab6a6"
 dependencies = [
  "approx",
  "built",
diff --git a/Cargo.toml b/Cargo.toml
index 16b79c1..80c0d82 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "birli"
 description = "A preprocessing pipeline for the Murchison Widefield Array"
-version = "0.12.0"
+version = "0.13.0"
 readme = "README.md"
 homepage = "https://github.com/MWATelescope/Birli"
 repository = "https://github.com/MWATelescope/Birli"
@@ -43,7 +43,7 @@ indicatif = { version = "0.17.0", features = ["rayon"] }
 itertools = "0.10.0"
 lazy_static = "1.4.0"
 log = "0.4.0"
-marlu = "0.12.0"
+marlu = "0.13.0"
 regex = "1.4.0"
 thiserror = "1.0.0"
 
@@ -64,7 +64,7 @@ csv = "1.1"
 float-cmp = "0.9"
 glob = "0.3"
 lexical = "6.0"
-marlu = { version = "0.12.0", features = ["approx"] }
+marlu = { version = "0.13.0", features = ["approx"] }
 ndarray = { version = "0.16.0", features = ["approx"] }
 tempfile = "3.3"
 
diff --git a/RELEASES.md b/RELEASES.md
index 1419d95..06b4aee 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -1,6 +1,12 @@
 <!-- markdownlint-disable=MD025 -->
 
+# Version 0.13.0 (2024-08-14)
+
+- 🐛 fix issues compiling on arm64:
+  - update Marlu 0.13.0
+
 # Version 0.12.0 (2024-06-27)
+
 - 🐛 bug fixes:
   - #152 default pfb gains should be cotter2014 for legacy correlator, not jake
 - 🙏 quality of life:
@@ -9,11 +15,13 @@
   - update default aoflagger version in makefile and dockerfile
 
 # Version 0.11.0 (2024-06-19)
+
 - ➕ dependencies:
   - Marlu 0.11.0
   - built ~0.7.3
 
 # Version 0.10.0 (2023-08-11)
+
 - 🙏 quality of life:
   - uvfits are now written out with a second DATE and INTTIM
 - ➕ dependencies:
@@ -21,6 +29,7 @@
   - use rust version 1.64
 
 # Version 0.9.2 (2023-07-18)
+
 - 🙏 quality of life:
   - update modtime when writing ms
 
diff --git a/src/flags.rs b/src/flags.rs
index 41eef75..7d83eb9 100644
--- a/src/flags.rs
+++ b/src/flags.rs
@@ -556,6 +556,7 @@ pub fn write_flags(
 mod tests {
     use super::write_flags;
     use glob::glob;
+    use std::ffi::c_char;
     use tempfile::tempdir;
 
     use crate::{
@@ -677,18 +678,18 @@ mod tests {
         );
 
         let tests = [
-            (0, 0, 0, i8::from(false)),
-            (0, 0, 1, i8::from(false)),
-            (0, 1, 0, i8::from(false)),
-            (0, 1, 1, i8::from(false)),
-            (0, 2, 0, i8::from(false)),
-            (0, 2, 1, i8::from(false)),
-            (1, 0, 0, i8::from(false)),
-            (1, 0, 1, i8::from(false)),
-            (1, 1, 0, i8::from(false)),
-            (1, 1, 1, i8::from(true)),
-            (1, 2, 0, i8::from(false)),
-            (1, 2, 1, i8::from(false)),
+            (0, 0, 0, c_char::from(false)),
+            (0, 0, 1, c_char::from(false)),
+            (0, 1, 0, c_char::from(false)),
+            (0, 1, 1, c_char::from(false)),
+            (0, 2, 0, c_char::from(false)),
+            (0, 2, 1, c_char::from(false)),
+            (1, 0, 0, c_char::from(false)),
+            (1, 0, 1, c_char::from(false)),
+            (1, 1, 0, c_char::from(false)),
+            (1, 1, 1, c_char::from(true)),
+            (1, 2, 0, c_char::from(false)),
+            (1, 2, 1, c_char::from(false)),
         ];
         for (timestep_idx, baseline_idx, fine_chan_idx, expected_flag) in tests {
             let row_idx = timestep_idx * num_baselines + baseline_idx;
diff --git a/src/io/mwaf.rs b/src/io/mwaf.rs
index 45e1562..5d6b366 100644
--- a/src/io/mwaf.rs
+++ b/src/io/mwaf.rs
@@ -8,7 +8,10 @@
 //! one column. Each cell in the table contains a binary vector of flags for each fine channel in
 //! the coarse channel.
 
-use std::path::{Path, PathBuf};
+use std::{
+    ffi::c_char,
+    path::{Path, PathBuf},
+};
 
 use fitsio::{tables::ColumnDataType, tables::ColumnDescription, FitsFile};
 use indicatif::{MultiProgress, ProgressBar, ProgressDrawTarget, ProgressStyle};
@@ -441,7 +444,7 @@ impl FlagFileSet {
 
         let mut status = 0;
 
-        let mut flag_cell = vec![0; flag_coarse_chan_view.len_of(Axis(1))];
+        let mut flag_cell: Vec<c_char> = vec![0; flag_coarse_chan_view.len_of(Axis(1))];
         for flag_timestep_view in flag_coarse_chan_view.outer_iter() {
             for (flag_baseline_view, baseline_flag_count) in flag_timestep_view
                 .axis_iter(Axis(1))
@@ -452,7 +455,7 @@ impl FlagFileSet {
                     .zip_eq(flag_baseline_view)
                     .zip_eq(channel_flag_counts.iter_mut())
                     .for_each(|((a, &b), count)| {
-                        *a = i8::from(b);
+                        *a = c_char::from(b);
                         if b {
                             *count += 1;
                         }
@@ -789,7 +792,7 @@ impl FlagFileSet {
     }
 
     #[cfg(test)]
-    pub(crate) fn read_flags(&self) -> Result<Array3<i8>, IOError> {
+    pub(crate) fn read_flags(&self) -> Result<Array3<c_char>, IOError> {
         let gpubox = &self.gpuboxes[0];
         let mut fptr = FitsFile::open(&gpubox.filename)?;
         let hdu = fits_open_hdu!(&mut fptr, 0)?;