diff --git a/Cargo.toml b/Cargo.toml
index 9877385..5c275dd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,18 +16,11 @@ failure = "0.1"
 init_with = "1.1.0"
 log = "0.4.1"
 pairing = { version = "0.14.2", features = ["u128-support"] }
-protobuf = { version = "2.0.0", optional = true }
 rand = "0.4.2"
 rand_derive = "0.3.1"
 ring = "^0.12"
 serde = "1.0.55"
 serde_derive = "1.0.55"
 
-[features]
-serialization-protobuf = [ "protobuf", "protobuf-codegen-pure" ]
-
-[build-dependencies]
-protobuf-codegen-pure = { version = "2.0.0", optional = true }
-
 [dev-dependencies]
 bincode = "1.0.0"
diff --git a/src/lib.rs b/src/lib.rs
index 90849f7..24b47d6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,8 +11,6 @@ extern crate init_with;
 #[macro_use]
 extern crate log;
 extern crate pairing;
-#[cfg(feature = "serialization-protobuf")]
-extern crate protobuf;
 extern crate rand;
 #[macro_use]
 extern crate rand_derive;
@@ -24,8 +22,6 @@ extern crate serde_derive;
 pub mod error;
 mod into_fr;
 pub mod poly;
-#[cfg(feature = "serialization-protobuf")]
-pub mod protobuf_impl;
 pub mod serde_impl;
 
 use std::fmt;
diff --git a/src/protobuf_impl.rs b/src/protobuf_impl.rs
deleted file mode 100644
index 2067933..0000000
--- a/src/protobuf_impl.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-use super::Signature;
-use pairing::bls12_381::G2Compressed;
-use pairing::{CurveAffine, CurveProjective, EncodedPoint};
-
-impl Signature {
-    pub fn to_vec(&self) -> Vec<u8> {
-        let comp = self.0.into_affine().into_compressed();
-        comp.as_ref().to_vec()
-    }
-
-    pub fn from_bytes(bytes: &[u8]) -> Option<Self> {
-        let mut comp = G2Compressed::empty();
-        comp.as_mut().copy_from_slice(bytes);
-        if let Ok(affine) = comp.into_affine() {
-            Some(Signature(affine.into_projective()))
-        } else {
-            None
-        }
-    }
-}