diff --git a/Cargo.toml b/Cargo.toml
index 6a0e84a..f791e85 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cesride"
-version = "0.6.0"
+version = "0.6.1"
 edition = "2021"
 description = "Cryptographic primitives for use with Composable Event Streaming Representation (CESR)"
 license = "Apache-2.0"
diff --git a/src/core/matter/mod.rs b/src/core/matter/mod.rs
index 8c9e8aa..09022ad 100644
--- a/src/core/matter/mod.rs
+++ b/src/core/matter/mod.rs
@@ -171,8 +171,12 @@ pub trait Matter: Default {
     }
 
     fn transferable(&self) -> bool {
-        const CODES: &[&str] =
-            &[tables::Codex::Ed25519N, tables::Codex::ECDSA_256k1N, tables::Codex::Ed448N];
+        const CODES: &[&str] = &[
+            tables::Codex::Ed25519N,
+            tables::Codex::ECDSA_256k1N,
+            tables::Codex::Ed448N,
+            tables::Codex::ECDSA_256r1N,
+        ];
 
         !CODES.contains(&self.code().as_str())
     }
@@ -817,8 +821,10 @@ mod test {
     #[rstest]
     #[case(TestMatter::new_with_code_and_raw(matter::Codex::Ed25519, b"00000000000000000000000000000000").unwrap(), true)]
     #[case(TestMatter::new_with_code_and_raw(matter::Codex::ECDSA_256k1, b"000000000000000000000000000000000").unwrap(), true)]
+    #[case(TestMatter::new_with_code_and_raw(matter::Codex::ECDSA_256r1, b"000000000000000000000000000000000").unwrap(), true)]
     #[case(TestMatter::new_with_code_and_raw(matter::Codex::Ed25519N, b"00000000000000000000000000000000").unwrap(), false)]
     #[case(TestMatter::new_with_code_and_raw(matter::Codex::ECDSA_256k1N, b"000000000000000000000000000000000").unwrap(), false)]
+    #[case(TestMatter::new_with_code_and_raw(matter::Codex::ECDSA_256r1N, b"000000000000000000000000000000000").unwrap(), false)]
     fn transferable(#[case] matter: TestMatter, #[case] result: bool) {
         assert_eq!(matter.transferable(), result);
     }