diff --git a/ci/big_rand/Cargo.toml b/ci/big_rand/Cargo.toml
index 199c022e..33dd20bc 100644
--- a/ci/big_rand/Cargo.toml
+++ b/ci/big_rand/Cargo.toml
@@ -6,9 +6,9 @@ edition = "2018"
 
 [dependencies]
 num-traits = "0.2.11"
-rand_chacha = "0.2"
-rand_isaac = "0.2"
-rand_xorshift = "0.2"
+rand_chacha = "0.3"
+rand_isaac = "0.3"
+rand_xorshift = "0.3"
 
 [dependencies.num-bigint]
 features = ["rand"]
@@ -16,4 +16,4 @@ path = "../.."
 
 [dependencies.rand]
 features = ["small_rng"]
-version = "0.7"
+version = "0.8"
diff --git a/ci/big_rand/src/lib.rs b/ci/big_rand/src/lib.rs
index 1bea5750..69728777 100644
--- a/ci/big_rand/src/lib.rs
+++ b/ci/big_rand/src/lib.rs
@@ -11,7 +11,7 @@ mod torture;
 mod biguint {
     use num_bigint::{BigUint, RandBigInt, RandomBits};
     use num_traits::Zero;
-    use rand::distributions::Uniform;
+    use rand::distributions::{Distribution, Uniform};
     use rand::thread_rng;
     use rand::{Rng, SeedableRng};
 
@@ -192,7 +192,7 @@ mod biguint {
 
         let mut rng = thread_rng();
         let bit_range = Uniform::new(0, 2048);
-        let sample_bits: Vec<_> = rng.sample_iter(&bit_range).take(100).collect();
+        let sample_bits: Vec<_> = bit_range.sample_iter(&mut rng).take(100).collect();
         for bits in sample_bits {
             let x = rng.gen_biguint(bits);
             for n in 2..11 {
diff --git a/ci/big_rand/src/torture.rs b/ci/big_rand/src/torture.rs
index 746128de..eac8c222 100644
--- a/ci/big_rand/src/torture.rs
+++ b/ci/big_rand/src/torture.rs
@@ -4,7 +4,10 @@ use rand::prelude::*;
 use rand::rngs::SmallRng;
 
 fn get_rng() -> SmallRng {
-    let seed = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
+    let seed = [
+        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,
+    ];
     SmallRng::from_seed(seed)
 }
 
@@ -14,8 +17,8 @@ fn test_mul_divide_torture_count(count: usize) {
 
     for _ in 0..count {
         // Test with numbers of random sizes:
-        let xbits = rng.gen_range(0, bits_max);
-        let ybits = rng.gen_range(0, bits_max);
+        let xbits = rng.gen_range(0..bits_max);
+        let ybits = rng.gen_range(0..bits_max);
 
         let x = rng.gen_biguint(xbits);
         let y = rng.gen_biguint(ybits);