diff --git a/Cargo.toml b/Cargo.toml
index d5638ad5..77d22e16 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,8 +12,7 @@ crate-type = ["lib", "cdylib"]
 normal = ["openssl-src"]
 
 [dependencies]
-c2pa = { version = "0.41.1", features = ["unstable_api", "file_io", "openssl", "pdf", "fetch_remote_manifests"]}
-c2pa-crypto = {version = "0.3.1" }
+c2pa = { version = "0.42.0", features = ["unstable_api", "file_io", "openssl", "pdf", "fetch_remote_manifests"]}
 thiserror = "1.0.49"
 uniffi = "0.28.2"
 openssl-src = "=300.3.1" # Required for openssl-sys
diff --git a/src/callback_signer.rs b/src/callback_signer.rs
index a033dc02..4be2d3ea 100644
--- a/src/callback_signer.rs
+++ b/src/callback_signer.rs
@@ -11,8 +11,6 @@
 // each license.
 
 use c2pa::{Signer, SigningAlg};
-// RawSigner is currently used only fully qualified
-use c2pa_crypto::{raw_signature::RawSignerError, time_stamp::TimeStampProvider};
 use log::debug;
 
 use crate::Result;
@@ -36,41 +34,6 @@ pub struct RemoteSigner {
     reserve_size: u32,
 }
 
-impl TimeStampProvider for RemoteSigner {}
-
-impl c2pa_crypto::raw_signature::RawSigner for RemoteSigner {
-    fn sign(&self, data: &[u8]) -> std::result::Result<Vec<u8>, RawSignerError> {
-        let signature_result = self.signer_callback.sign(data.to_vec());
-
-        match signature_result {
-            Ok(signature) => Ok(signature),
-            Err(e) => Err(c2pa_crypto::raw_signature::RawSignerError::IoError(
-                e.to_string(),
-            )),
-        }
-    }
-
-    fn alg(&self) -> c2pa_crypto::raw_signature::SigningAlg {
-        match self.alg {
-            SigningAlg::Es384 => c2pa_crypto::raw_signature::SigningAlg::Es384,
-            SigningAlg::Es512 => c2pa_crypto::raw_signature::SigningAlg::Es512,
-            SigningAlg::Ps256 => c2pa_crypto::raw_signature::SigningAlg::Ps256,
-            SigningAlg::Ps384 => c2pa_crypto::raw_signature::SigningAlg::Ps384,
-            SigningAlg::Ps512 => c2pa_crypto::raw_signature::SigningAlg::Ps512,
-            SigningAlg::Ed25519 => c2pa_crypto::raw_signature::SigningAlg::Ed25519,
-            SigningAlg::Es256 => c2pa_crypto::raw_signature::SigningAlg::Es256,
-        }
-    }
-
-    fn cert_chain(&self) -> std::result::Result<Vec<Vec<u8>>, RawSignerError> {
-        Ok(Vec::new())
-    }
-
-    fn reserve_size(&self) -> usize {
-        self.reserve_size as usize
-    }
-}
-
 impl Signer for RemoteSigner {
     fn sign(&self, data: &[u8]) -> c2pa::Result<Vec<u8>> {
         self.signer_callback
@@ -94,10 +57,6 @@ impl Signer for RemoteSigner {
     fn direct_cose_handling(&self) -> bool {
         true
     }
-
-    fn raw_signer(&self) -> Box<&dyn c2pa_crypto::raw_signature::RawSigner> {
-        Box::new(self)
-    }
 }
 
 impl CallbackSigner {
diff --git a/tests/test_api.py b/tests/test_api.py
index c9758100..66922b60 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -52,6 +52,7 @@ def getitem(d, key):
     ]
 }
 
+# ingredient we will use for testing
 ingredient_def = {
     "relationship": "parentOf",
     "thumbnail": {