diff --git a/Cargo.lock b/Cargo.lock
index 3f4780d..4238078 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -264,7 +264,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2fe0a4fafae25053c19a03fefe040607bda956b4941d692ed9fb9d3c18a3193"
 dependencies = [
  "const-oid",
- "pem-rfc7468",
  "zeroize",
 ]
 
@@ -316,7 +315,6 @@ dependencies = [
  "elliptic-curve",
  "rfc6979",
  "signature",
- "spki",
  "zeroize",
 ]
 
@@ -353,7 +351,6 @@ dependencies = [
  "ff",
  "group",
  "hybrid-array",
- "pkcs8",
  "rand_core",
  "sec1",
  "subtle",
@@ -548,16 +545,6 @@ dependencies = [
  "base64ct",
 ]
 
-[[package]]
-name = "pkcs1"
-version = "0.8.0-rc.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2345503b65d9be13aac96ddbec3eed60def8bc83869f9a519789afbcf3c2bea"
-dependencies = [
- "der",
- "spki",
-]
-
 [[package]]
 name = "pkcs8"
 version = "0.11.0-rc.6"
@@ -684,8 +671,6 @@ dependencies = [
  "crypto-bigint",
  "crypto-primes",
  "digest",
- "pkcs1",
- "pkcs8",
  "rand_core",
  "sha2",
  "signature",
diff --git a/ssh-key/Cargo.toml b/ssh-key/Cargo.toml
index 7dc080e..2762a09 100644
--- a/ssh-key/Cargo.toml
+++ b/ssh-key/Cargo.toml
@@ -49,7 +49,7 @@ rand_chacha = "0.9"
 [features]
 default = ["ecdsa", "rand_core", "std"]
 alloc = ["encoding/alloc", "signature/alloc", "zeroize/alloc", ]
-std = ["alloc", "p256?/std", "p384?/std", "p521?/std", "rsa?/std", "sec1?/std", "dep:home"]
+std = ["alloc", "dep:home"]
 
 crypto = ["ed25519", "p256", "p384", "p521", "rsa"] # NOTE: `dsa` is obsolete/weak
 dsa = ["dep:dsa", "dep:sha1", "alloc", "encoding/bigint", "signature/rand_core"]