diff --git a/Cargo.toml b/Cargo.toml
index 65ea032..99ef87d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ travis-ci = { repository = "lipanski/mockito", branch = "master" }
 appveyor = { repository = "lipanski/mockito", branch = "master", service = "github" }
 
 [dependencies]
-rand = "0.7.0"
+rand = "0.8"
 httparse = "1.3.3"
 regex = "1.0.5"
 lazy_static = "1.1.0"
diff --git a/src/lib.rs b/src/lib.rs
index 9e90121..a9eb6bd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -951,7 +951,11 @@ pub struct Mock {
 impl Mock {
     fn new<P: Into<Matcher>>(method: &str, path: P) -> Self {
         Self {
-            id: thread_rng().sample_iter(&Alphanumeric).take(24).collect(),
+            id: thread_rng()
+                .sample_iter(&Alphanumeric)
+                .map(char::from)
+                .take(24)
+                .collect(),
             method: method.to_owned().to_uppercase(),
             path: PathAndQueryMatcher::Unified(path.into()),
             headers: Vec::new(),
diff --git a/tests/lib.rs b/tests/lib.rs
index f3f003a..e54eccd 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -797,6 +797,7 @@ fn test_all_of_missing_match_header() {
 fn test_large_utf8_body() {
     let mock_body: String = rand::thread_rng()
         .sample_iter(&Alphanumeric)
+        .map(char::from)
         .take(3 * 1024) // Must be larger than the request read buffer
         .collect();