diff --git a/Cargo.toml b/Cargo.toml
index 6ae3872..bfaee32 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ default-features = false
 
 [dependencies.rand]
 optional = true
-version = "0.5"
+version = "0.7"
 default-features = false
 
 [features]
diff --git a/src/crand.rs b/src/crand.rs
index 9e43974..651a896 100644
--- a/src/crand.rs
+++ b/src/crand.rs
@@ -42,8 +42,8 @@ where
 }
 
 #[cfg(test)]
-fn test_rng() -> SmallRng {
-    SmallRng::from_seed([42; 16])
+fn test_rng() -> StdRng {
+    StdRng::from_seed([42; 32])
 }
 
 #[test]