diff --git a/Cargo.lock b/Cargo.lock
index 6e7678fb..14f4f51d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -371,8 +371,7 @@ dependencies = [
 [[package]]
 name = "pkcs1"
 version = "0.8.0-rc.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d2f4c73d459a85331915baebd5082dce5ee8ef16fd9a1ca75559ac91e66a9ee"
+source = "git+https://github.com/RustCrypto/formats.git#3fb883b2f445e74f38f51fef63a347ecfe69f623"
 dependencies = [
  "der",
  "pkcs8",
@@ -399,8 +398,7 @@ dependencies = [
 [[package]]
 name = "pkcs8"
 version = "0.11.0-rc.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "66180445f1dce533620a7743467ef85fe1c5e80cdaf7c7053609d7a2fbcdae20"
+source = "git+https://github.com/RustCrypto/formats.git#3fb883b2f445e74f38f51fef63a347ecfe69f623"
 dependencies = [
  "der",
  "pkcs5",
diff --git a/Cargo.toml b/Cargo.toml
index dbb5a1b1..dd466e24 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -65,3 +65,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [profile.dev]
 opt-level = 2
+
+[patch.crates-io]
+pkcs1 = { git = "https://github.com/RustCrypto/formats.git" }
+pkcs8 = { git = "https://github.com/RustCrypto/formats.git" }
diff --git a/src/encoding.rs b/src/encoding.rs
index 51d5032d..d487de39 100644
--- a/src/encoding.rs
+++ b/src/encoding.rs
@@ -9,7 +9,8 @@ use crate::{
 };
 use core::convert::{TryFrom, TryInto};
 use pkcs8::{
-    der::Encode, Document, EncodePrivateKey, EncodePublicKey, ObjectIdentifier, SecretDocument,
+    der::{asn1::OctetStringRef, Encode},
+    Document, EncodePrivateKey, EncodePublicKey, ObjectIdentifier, SecretDocument,
 };
 use zeroize::Zeroizing;
 
@@ -37,10 +38,10 @@ pub(crate) fn verify_algorithm_id(
     Ok(())
 }
 
-impl TryFrom<pkcs8::PrivateKeyInfo<'_>> for RsaPrivateKey {
+impl TryFrom<pkcs8::PrivateKeyInfoRef<'_>> for RsaPrivateKey {
     type Error = pkcs8::Error;
 
-    fn try_from(private_key_info: pkcs8::PrivateKeyInfo<'_>) -> pkcs8::Result<Self> {
+    fn try_from(private_key_info: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
         verify_algorithm_id(&private_key_info.algorithm)?;
 
         let pkcs1_key = pkcs1::RsaPrivateKey::try_from(private_key_info.private_key)?;
@@ -110,7 +111,11 @@ impl EncodePrivateKey for RsaPrivateKey {
         }
         .to_der()?;
 
-        pkcs8::PrivateKeyInfo::new(pkcs1::ALGORITHM_ID, private_key.as_ref()).try_into()
+        pkcs8::PrivateKeyInfoRef::new(
+            pkcs1::ALGORITHM_ID,
+            OctetStringRef::new(private_key.as_ref())?,
+        )
+        .try_into()
     }
 }
 
diff --git a/src/pkcs1v15/signing_key.rs b/src/pkcs1v15/signing_key.rs
index 8914479d..b0da5293 100644
--- a/src/pkcs1v15/signing_key.rs
+++ b/src/pkcs1v15/signing_key.rs
@@ -247,13 +247,13 @@ where
         };
 }
 
-impl<D> TryFrom<pkcs8::PrivateKeyInfo<'_>> for SigningKey<D>
+impl<D> TryFrom<pkcs8::PrivateKeyInfoRef<'_>> for SigningKey<D>
 where
     D: Digest + AssociatedOid,
 {
     type Error = pkcs8::Error;
 
-    fn try_from(private_key_info: pkcs8::PrivateKeyInfo<'_>) -> pkcs8::Result<Self> {
+    fn try_from(private_key_info: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
         private_key_info
             .algorithm
             .assert_algorithm_oid(pkcs1::ALGORITHM_OID)?;
diff --git a/src/pss/blinded_signing_key.rs b/src/pss/blinded_signing_key.rs
index 9f990125..c96c4330 100644
--- a/src/pss/blinded_signing_key.rs
+++ b/src/pss/blinded_signing_key.rs
@@ -201,13 +201,13 @@ where
     }
 }
 
-impl<D> TryFrom<pkcs8::PrivateKeyInfo<'_>> for BlindedSigningKey<D>
+impl<D> TryFrom<pkcs8::PrivateKeyInfoRef<'_>> for BlindedSigningKey<D>
 where
     D: Digest + AssociatedOid,
 {
     type Error = pkcs8::Error;
 
-    fn try_from(private_key_info: pkcs8::PrivateKeyInfo<'_>) -> pkcs8::Result<Self> {
+    fn try_from(private_key_info: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
         RsaPrivateKey::try_from(private_key_info).map(Self::new)
     }
 }
diff --git a/src/pss/signing_key.rs b/src/pss/signing_key.rs
index 0ed526bd..16a8f0fa 100644
--- a/src/pss/signing_key.rs
+++ b/src/pss/signing_key.rs
@@ -225,13 +225,13 @@ where
     }
 }
 
-impl<D> TryFrom<pkcs8::PrivateKeyInfo<'_>> for SigningKey<D>
+impl<D> TryFrom<pkcs8::PrivateKeyInfoRef<'_>> for SigningKey<D>
 where
     D: Digest + AssociatedOid,
 {
     type Error = pkcs8::Error;
 
-    fn try_from(private_key_info: pkcs8::PrivateKeyInfo<'_>) -> pkcs8::Result<Self> {
+    fn try_from(private_key_info: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
         verify_algorithm_id(&private_key_info.algorithm)?;
         RsaPrivateKey::try_from(private_key_info).map(Self::new)
     }