diff --git a/Cargo.toml b/Cargo.toml
index 666ac48..d245110 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,10 +22,7 @@ subtle = { version = "2.1.1", default-features = false }
 digest = { version = "0.10.0", default-features = false }
 pkcs1 = { version = "0.3.3", default-features = false, features = ["pkcs8"] }
 pkcs8 = { version = "0.8", default-features = false }
-
-[dependencies.zeroize]
-version = ">=1, <1.5" # zeroize 1.4 is MSRV 1.51+
-features = ["alloc", "zeroize_derive"]
+zeroize = { version = "1", features = ["alloc"] }
 
 [dependencies.serde_crate]
 package = "serde"
diff --git a/src/key.rs b/src/key.rs
index 6bc517b..5be5b9f 100644
--- a/src/key.rs
+++ b/src/key.rs
@@ -138,7 +138,7 @@ impl Drop for PrecomputedValues {
 }
 
 /// Contains the precomputed Chinese remainder theorem values.
-#[derive(Debug, Clone, Zeroize)]
+#[derive(Debug, Clone)]
 pub(crate) struct CRTValue {
     /// D mod (prime - 1)
     pub(crate) exp: BigInt,
@@ -148,6 +148,14 @@ pub(crate) struct CRTValue {
     pub(crate) r: BigInt,
 }
 
+impl Zeroize for CRTValue {
+    fn zeroize(&mut self) {
+        self.exp.zeroize();
+        self.coeff.zeroize();
+        self.r.zeroize();
+    }
+}
+
 impl From<RsaPrivateKey> for RsaPublicKey {
     fn from(private_key: RsaPrivateKey) -> Self {
         (&private_key).into()