diff --git a/Cargo.toml b/Cargo.toml
index e305844fa..1bea73a86 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ homepage = "https://github.com/matter-labs/bellman"
 license = "MIT/Apache-2.0"
 name = "bellman_ce"
 repository = "https://github.com/matter-labs/bellman"
-version = "0.3.3"
+version = "0.3.4"
 edition = "2018"
 
 [lib]
@@ -18,7 +18,7 @@ bit-vec = "0.6"
 cfg-if = "0.1"
 
 #pairing = {package = "pairing_ce", path = "../pairing" }
-pairing = {package = "pairing_ce", version = "0.20" }
+pairing = {package = "pairing_ce", version = "0.21" }
 byteorder = "1"
 
 futures= {package = "futures", version = "0.3", default_features = false, features = ["executor"]}
diff --git a/src/tests/dummy_engine.rs b/src/tests/dummy_engine.rs
index fbad77678..1fdd349c8 100644
--- a/src/tests/dummy_engine.rs
+++ b/src/tests/dummy_engine.rs
@@ -24,7 +24,7 @@ use std::num::Wrapping;
 
 const MODULUS_R: Wrapping<u32> = Wrapping(64513);
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 pub struct Fr(Wrapping<u32>);
 
 impl fmt::Display for Fr {
@@ -160,7 +160,7 @@ impl SqrtField for Fr {
     }
 }
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
 pub struct FrRepr([u64; 1]);
 
 impl Ord for FrRepr {