diff --git a/Cargo.toml b/Cargo.toml
index e3fbd4e38..f7e062fd1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -76,7 +76,7 @@ mime = "0.3"
 mime_guess = "2.0.0-alpha"
 num_cpus = "1.0"
 percent-encoding = "1.0"
-rand = "0.5"
+rand = "0.6"
 regex = "1.0"
 serde = "1.0"
 serde_json = "1.0"
diff --git a/tests/test_client.rs b/tests/test_client.rs
index 8c5d5819d..9808f3e6f 100644
--- a/tests/test_client.rs
+++ b/tests/test_client.rs
@@ -179,7 +179,7 @@ fn test_client_gzip_encoding_large() {
 #[test]
 fn test_client_gzip_encoding_large_random() {
     let data = rand::thread_rng()
-        .gen_ascii_chars()
+        .sample_iter(&rand::distributions::Alphanumeric)
         .take(100_000)
         .collect::<String>();
 
@@ -247,7 +247,7 @@ fn test_client_brotli_encoding() {
 #[test]
 fn test_client_brotli_encoding_large_random() {
     let data = rand::thread_rng()
-        .gen_ascii_chars()
+        .sample_iter(&rand::distributions::Alphanumeric)
         .take(70_000)
         .collect::<String>();
 
@@ -309,7 +309,7 @@ fn test_client_deflate_encoding() {
 #[test]
 fn test_client_deflate_encoding_large_random() {
     let data = rand::thread_rng()
-        .gen_ascii_chars()
+        .sample_iter(&rand::distributions::Alphanumeric)
         .take(70_000)
         .collect::<String>();