diff --git a/powersoftau/Cargo.lock b/powersoftau/Cargo.lock
index 8bb4092..74e7a74 100644
--- a/powersoftau/Cargo.lock
+++ b/powersoftau/Cargo.lock
@@ -214,6 +214,11 @@ name = "hex"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "hex"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "hex-literal"
 version = "0.1.4"
@@ -325,6 +330,7 @@ dependencies = [
  "crossbeam 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "exitcode 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -514,6 +520,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)" = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
 "checksum generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2"
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
+"checksum hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"
 "checksum hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "ddc2928beef125e519d69ae1baa8c37ea2e0d3848545217f6db0179c5eb1d639"
 "checksum hex-literal-impl 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1d340b6514f232f6db1bd16db65302a5278a04fef9ce867cb932e7e5fa21130a"
 "checksum itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8467d9c1cebe26feb08c640139247fac215782d35371ade9a2136ed6085358"
diff --git a/powersoftau/Cargo.toml b/powersoftau/Cargo.toml
index 624d3d4..1bc5ff6 100644
--- a/powersoftau/Cargo.toml
+++ b/powersoftau/Cargo.toml
@@ -21,6 +21,7 @@ byteorder = "1.1.0"
 hex-literal = "0.1.4"
 rust-crypto = "0.2"
 exitcode = "1.1.2"
+hex = "0.4.0"
 
 memmap = "0.7.0"
 itertools = "0.8.0"
diff --git a/powersoftau/src/bin/beacon_constrained.rs b/powersoftau/src/bin/beacon_constrained.rs
index 6b89185..6af6ea9 100644
--- a/powersoftau/src/bin/beacon_constrained.rs
+++ b/powersoftau/src/bin/beacon_constrained.rs
@@ -1,3 +1,4 @@
+extern crate hex;
 use powersoftau::{
     batched_accumulator::BatchedAccumulator,
     keypair::keypair,
@@ -11,9 +12,6 @@ use std::fs::OpenOptions;
 
 use std::io::Write;
 
-#[macro_use]
-extern crate hex_literal;
-
 const INPUT_IS_COMPRESSED: UseCompression = UseCompression::No;
 const COMPRESS_THE_OUTPUT: UseCompression = UseCompression::Yes;
 const CHECK_INPUT_CORRECTNESS: CheckForCorrectness = CheckForCorrectness::No;
@@ -29,7 +27,7 @@ fn main() {
     let response_filename = &args[2];
     let circuit_power = args[3].parse().expect("could not parse circuit power");
     let batch_size = args[4].parse().expect("could not parse batch size");
-    let beacon_hash = args[5];
+    let beacon_hash = &args[5];
 
     let parameters = CeremonyParams::<Bn256>::new(circuit_power, batch_size);
 
@@ -50,7 +48,7 @@ fn main() {
         use rand::chacha::ChaChaRng;
         use rand::SeedableRng;
 
-        let mut cur_hash: [u8; 32] = hex!(beacon_hash);
+        let mut cur_hash = hex::decode(beacon_hash).unwrap();
 
         // Performs 2^n hash iterations over it
         const N: u64 = 10;