diff --git a/Cargo.toml b/Cargo.toml
index 6064d04..e2b14f0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ license = "MIT OR Apache-2.0"
 name = "api"
 
 [dependencies]
-rand = "~0.3.14"
+rand = "0.5.4"
 rustc-serialize = "~0.3.19"
 byteorder = "~0.5.3"
 
diff --git a/src/fields/tests.rs b/src/fields/tests.rs
index e9f738c..c21ac55 100644
--- a/src/fields/tests.rs
+++ b/src/fields/tests.rs
@@ -117,8 +117,10 @@ pub fn field_trials<F: FieldElement>() {
     assert_eq!(-F::one() + F::one(), F::zero());
     assert_eq!(F::zero() - F::zero(), F::zero());
 
-    let seed: [usize; 4] = [103245, 191922, 1293, 192103];
-    let mut rng = StdRng::from_seed(&seed);
+    //let seed: [usize; 4] = [103245, 191922, 1293, 192103];
+    //let mut rng = StdRng::from_seed(&seed);
+    let seed: [u8; 32] = [1, 2,3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32];
+    let mut rng: StdRng = SeedableRng::from_seed(seed);
 
     rand_element_squaring::<F, StdRng>(&mut rng);
     rand_element_addition_and_negation::<F, StdRng>(&mut rng);
diff --git a/src/groups/mod.rs b/src/groups/mod.rs
index fd9df00..2f28857 100644
--- a/src/groups/mod.rs
+++ b/src/groups/mod.rs
@@ -798,8 +798,10 @@ fn test_reduced_pairing() {
 #[test]
 fn test_binlinearity() {
     use rand::{SeedableRng,StdRng};
-    let seed: [usize; 4] = [103245, 191922, 1293, 192103];
-    let mut rng = StdRng::from_seed(&seed);
+    //let seed: [usize; 4] = [103245, 191922, 1293, 192103];
+    //let mut rng = StdRng::from_seed(&seed);
+    let seed: [u8; 32] = [1, 2,3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32];
+    let mut rng: StdRng = SeedableRng::from_seed(seed);
 
     for _ in 0..50 {
         let p = G1::random(&mut rng);
diff --git a/src/groups/tests.rs b/src/groups/tests.rs
index 3b32fb8..e287261 100644
--- a/src/groups/tests.rs
+++ b/src/groups/tests.rs
@@ -91,8 +91,9 @@ pub fn group_trials<G: GroupElement>() {
     assert!((G::one() * (-Fr::one()) + G::one()).is_zero());
 
     use rand::{SeedableRng,StdRng};
-    let seed: [usize; 4] = [103245, 191922, 1293, 192103];
-    let mut rng = StdRng::from_seed(&seed);
+    // let seed: [usize; 4] = [103245, 191922, 1293, 192103];
+    let seed: [u8; 32] = [1, 2,3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32];
+    let mut rng: StdRng = SeedableRng::from_seed(seed);
 
     random_test_addition::<G, _>(&mut rng);
     random_test_doubling::<G, _>(&mut rng);