diff --git a/Cargo.toml b/Cargo.toml
index 4a564d1..132f31e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,22 +14,23 @@ path = "src/lib.rs"
 [[example]]
 name = "server"
 path = "examples/server.rs"
-required-features = ["json"]
+required-features = ["json", "sha1"]
 
 [dependencies]
 chrono = "0.4"
-rand = "0.9.0"
+rand = "0.9"
 sha2 = "0"
-base16ct = { version = "0.2", features = ["alloc"] }
-sha1 = "0"
+base16ct = { version = "0.3", features = ["alloc"] }
+sha1 = { version = "0", optional = true }
 hmac = "0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", optional = true }
-thiserror = "2.0.12"
+thiserror = "2.0"
 
 [features]
 default = []
-json = ["serde_json"]
+json = ["dep:serde_json"]
+sha1 = ["dep:sha1"]
 
 [dev-dependencies]
 actix-web = "4"
diff --git a/src/algorithm.rs b/src/algorithm.rs
index b299e08..0a8e264 100644
--- a/src/algorithm.rs
+++ b/src/algorithm.rs
@@ -5,10 +5,13 @@ use std::str::FromStr;
 /// Algorithm options for the challenge
 #[derive(Debug, Clone, Copy, Deserialize, Serialize)]
 pub enum AltchaAlgorithm {
+    #[cfg(feature = "sha1")]
     #[serde(rename = "SHA-1")]
     Sha1,
     #[serde(rename = "SHA-256")]
     Sha256,
+    #[serde(rename = "SHA-384")]
+    Sha384,
     #[serde(rename = "SHA-512")]
     Sha512,
 }
@@ -17,8 +20,10 @@ impl FromStr for AltchaAlgorithm {
     type Err = ();
     fn from_str(input: &str) -> Result<AltchaAlgorithm, Self::Err> {
         match input {
+            #[cfg(feature = "sha1")]
             "SHA-1" => Ok(AltchaAlgorithm::Sha1),
             "SHA-256" => Ok(AltchaAlgorithm::Sha256),
+            "SHA-384" => Ok(AltchaAlgorithm::Sha384),
             "SHA-512" => Ok(AltchaAlgorithm::Sha512),
             _ => Err(()),
         }
@@ -28,8 +33,10 @@ impl FromStr for AltchaAlgorithm {
 impl Display for AltchaAlgorithm {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let str = match self {
+            #[cfg(feature = "sha1")]
             AltchaAlgorithm::Sha1 => "SHA-1",
             AltchaAlgorithm::Sha256 => "SHA-256",
+            AltchaAlgorithm::Sha384 => "SHA-384",
             AltchaAlgorithm::Sha512 => "SHA-512",
         };
         write!(f, "{}", str)
diff --git a/src/lib.rs b/src/lib.rs
index 93ec7e2..2c409fd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -345,7 +345,7 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "json")]
+    #[cfg(all(feature = "json", feature = "sha1"))]
     fn test_create_json_challenge() {
         let challenge_json = create_json_challenge(ChallengeOptions {
             algorithm: Some(AltchaAlgorithm::Sha1),
diff --git a/src/utils.rs b/src/utils.rs
index 059d26f..685a98a 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -3,12 +3,15 @@ use hmac::digest::{Digest, KeyInit};
 use hmac::{Hmac, Mac};
 use rand::distr::uniform::Error;
 use rand::Rng;
+#[cfg(feature = "sha1")]
 use sha1::Sha1;
-use sha2::{Sha256, Sha512};
+use sha2::{Sha256, Sha384, Sha512};
 use std::collections::HashMap;
 
+#[cfg(feature = "sha1")]
 type HmacSha1 = Hmac<Sha1>;
 type HmacSha256 = Hmac<Sha256>;
+type HmacSha384 = Hmac<Sha384>;
 type HmacSha512 = Hmac<Sha512>;
 pub type ParamsMapType = HashMap<String, String>;
 
@@ -27,8 +30,10 @@ pub fn random_int(max: u64) -> Result<u64, Error> {
 
 pub fn hash_function(altcha_algorithm: &AltchaAlgorithm, data: &str) -> String {
     match altcha_algorithm {
+        #[cfg(feature = "sha1")]
         AltchaAlgorithm::Sha1 => hash_str_to_hex::<Sha1>(data),
         AltchaAlgorithm::Sha256 => hash_str_to_hex::<Sha256>(data),
+        AltchaAlgorithm::Sha384 => hash_str_to_hex::<Sha384>(data),
         AltchaAlgorithm::Sha512 => hash_str_to_hex::<Sha512>(data),
     }
 }
@@ -40,8 +45,10 @@ fn hash_str_to_hex<Hash: Digest>(data: &str) -> String {
 
 pub fn hmac_function(altcha_algorithm: &AltchaAlgorithm, data: &str, key: &str) -> String {
     match altcha_algorithm {
+        #[cfg(feature = "sha1")]
         AltchaAlgorithm::Sha1 => hmac_from_slice_to_hex_str::<HmacSha1>(data, key),
         AltchaAlgorithm::Sha256 => hmac_from_slice_to_hex_str::<HmacSha256>(data, key),
+        AltchaAlgorithm::Sha384 => hmac_from_slice_to_hex_str::<HmacSha384>(data, key),
         AltchaAlgorithm::Sha512 => hmac_from_slice_to_hex_str::<HmacSha512>(data, key),
     }
 }