diff --git a/newsfragments/5569.changed.md b/newsfragments/5569.changed.md
new file mode 100644
index 00000000000..d8b57b0da6c
--- /dev/null
+++ b/newsfragments/5569.changed.md
@@ -0,0 +1 @@
+bump marshal version to 5
diff --git a/src/marshal.rs b/src/marshal.rs
index 6866a7cc1c0..608b86ad8d6 100644
--- a/src/marshal.rs
+++ b/src/marshal.rs
@@ -10,7 +10,7 @@ use crate::{PyResult, Python};
 use std::ffi::c_int;
 
 /// The current version of the marshal binary format.
-pub const VERSION: i32 = 4;
+pub const VERSION: i32 = 5;
 
 /// Serialize an object to bytes using the Python built-in marshal module.
 ///