diff --git a/Cargo.toml b/Cargo.toml
index 8c7a4e8..70e72e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,4 +11,4 @@ documentation = "https://docs.rs/mapgen"
 edition = "2018"
 
 [dependencies]
-rand = "0.7"
+rand = "0.8"
diff --git a/src/random.rs b/src/random.rs
index 9ebd257..787a4c1 100644
--- a/src/random.rs
+++ b/src/random.rs
@@ -41,7 +41,7 @@ mod tests {
 
     #[test]
     fn test_range_average() {
-        let num_op = 1000;
+        let num_op = 10000;
         let mut rng = StdRng::seed_from_u64(1000);
         let xs: Vec<usize> = (0..num_op).map(|_| rng.random_range(5, 10)).collect();
         let mean = xs.iter().sum::<usize>() / num_op;