diff --git a/Cargo.lock b/Cargo.lock
index 5394a158..06417613 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -304,9 +304,9 @@ dependencies = [
 
 [[package]]
 name = "der"
-version = "0.8.0-rc.7"
+version = "0.8.0-rc.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2fe0a4fafae25053c19a03fefe040607bda956b4941d692ed9fb9d3c18a3193"
+checksum = "7050e8041c28720851f7db83183195b6acf375bb7bb28e3b86f0fe6cbd69459d"
 dependencies = [
  "const-oid",
  "der_derive",
@@ -316,9 +316,9 @@ dependencies = [
 
 [[package]]
 name = "der_derive"
-version = "0.8.0-rc.3"
+version = "0.8.0-rc.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d184a65ac0a9db9e66e0d629bea86d0402198b2a5cc01c9c16de7a6537f0ac4f"
+checksum = "14bfffadecb79dfde429f5dcd7553780c2cea5f7d0e72ad7c37a74f1ef79230a"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/dsa/Cargo.toml b/dsa/Cargo.toml
index 0d47f2e3..b096b631 100644
--- a/dsa/Cargo.toml
+++ b/dsa/Cargo.toml
@@ -16,7 +16,7 @@ keywords = ["crypto", "nist", "signature"]
 rust-version = "1.85"
 
 [dependencies]
-der = { version = "0.8.0-rc.7", features = ["alloc"] }
+der = { version = "0.8.0-rc.8", features = ["alloc"] }
 digest = "0.11.0-rc.0"
 crypto-bigint = { version = "0.7.0-rc.0", default-features = false, features = ["alloc", "zeroize"] }
 crypto-primes = { version = "=0.7.0-pre.1", default-features = false }
@@ -36,7 +36,7 @@ proptest = "1"
 rand = "0.9"
 rand_chacha = "0.9"
 sha1 = "0.11.0-rc.0"
-der = { version = "0.8.0-rc.6", features = ["derive"] }
+der = { version = "0.8.0-rc.8", features = ["derive"] }
 
 [features]
 default = ["pkcs8"]
diff --git a/ecdsa/Cargo.toml b/ecdsa/Cargo.toml
index 9b530e86..28ec0bfb 100644
--- a/ecdsa/Cargo.toml
+++ b/ecdsa/Cargo.toml
@@ -22,7 +22,7 @@ signature = { version = "3.0.0-rc.2", default-features = false, features = ["ran
 zeroize = { version = "1.5", default-features = false }
 
 # optional dependencies
-der = { version = "0.8.0-rc.7", optional = true }
+der = { version = "0.8.0-rc.8", optional = true }
 digest = { version = "0.11.0-rc.0", optional = true, default-features = false, features = ["oid"] }
 rfc6979 = { version = "0.5.0-rc.0", optional = true }
 serdect = { version = "0.3", optional = true, default-features = false, features = ["alloc"] }
diff --git a/ecdsa/src/der.rs b/ecdsa/src/der.rs
index 89ca1933..88cb98ef 100644
--- a/ecdsa/src/der.rs
+++ b/ecdsa/src/der.rs
@@ -204,10 +204,10 @@ where
 
     fn decode<R: Reader<'a>>(reader: &mut R) -> der::Result<Self> {
         let header = Header::peek(reader)?;
-        header.tag.assert_eq(Tag::Sequence)?;
+        header.tag().assert_eq(Tag::Sequence)?;
 
         let mut buf = SignatureBytes::<C>::default();
-        let len = (header.encoded_len()? + header.length)?;
+        let len = (header.encoded_len()? + header.length())?;
         let slice = buf
             .get_mut(..usize::try_from(len)?)
             .ok_or_else(|| reader.error(Tag::Sequence.length_error()))?;