Index: nix/test/sys/test_sockopt.rs
===================================================================
--- nix.orig/test/sys/test_sockopt.rs
+++ nix/test/sys/test_sockopt.rs
@@ -5,1 +5,2 @@
-use rand::{rng, Rng};
+use rand::Rng;
+use rand::thread_rng as rng;
@@ -125,7 +126,7 @@ fn test_so_buf() {
         SockProtocol::Udp,
     )
     .unwrap();
-    let bufsize: usize = rng().random_range(4096..131_072);
+    let bufsize: usize = rng().gen_range(4096..131_072);
     setsockopt(&fd, sockopt::SndBuf, &bufsize).unwrap();
     let actual = getsockopt(&fd, sockopt::SndBuf).unwrap();
     assert!(actual >= bufsize);
Index: nix/test/sys/test_uio.rs
===================================================================
--- nix.orig/test/sys/test_uio.rs
+++ nix/test/sys/test_uio.rs
@@ -1,2 +1,2 @@
-use rand::distr::Alphanumeric;
-use rand::{rng, Rng};
+use rand::Rng;
+use rand::thread_rng as rng;
@@ -14,17 +14,30 @@ use tempfile::tempdir;
 #[cfg(not(target_os = "redox"))]
 use tempfile::tempfile;
 
+#[cfg(test)]
+fn randomstring(r: impl Rng, len : usize) -> String {
+    let mut result = String::with_capacity(len);
+    for _ in 0..len {
+        let r = rng().gen_range(0..62);
+        let c = if r < 10 {
+            r + b'0'
+        } else if r < 36 {
+            r - 10 + b'a'
+        } else {
+            r - 36 + b'A'
+        };
+        result.push(c as char);
+    }
+    result
+}
+
 #[test]
 // On Solaris sometimes wrtitev() returns EINVAL.
 #[cfg(not(target_os = "solaris"))]
 fn test_writev() {
     let mut to_write = Vec::with_capacity(16 * 128);
     for _ in 0..16 {
-        let s: String = rng()
-            .sample_iter(&Alphanumeric)
-            .map(char::from)
-            .take(128)
-            .collect();
+        let s = randomstring(rng(),128);
         let b = s.as_bytes();
         to_write.extend(b.iter().cloned());
     }
@@ -36,7 +49,7 @@ fn test_writev() {
         let slice_len = if left <= 64 {
             left
         } else {
-            rng().random_range(64..cmp::min(256, left))
+            rng().gen_range(64..cmp::min(256, left))
         };
         let b = &to_write[consumed..consumed + slice_len];
         iovecs.push(IoSlice::new(b));
@@ -62,11 +75,7 @@ fn test_writev() {
 #[test]
 #[cfg(not(target_os = "redox"))]
 fn test_readv() {
-    let s: String = rng()
-        .sample_iter(&Alphanumeric)
-        .map(char::from)
-        .take(128)
-        .collect();
+    let s: String = randomstring(rng(),128);
     let to_write = s.as_bytes().to_vec();
     let mut storage = Vec::new();
     let mut allocated = 0;
@@ -75,7 +84,7 @@ fn test_readv() {
         let vec_len = if left <= 64 {
             left
         } else {
-            rng().random_range(64..cmp::min(256, left))
+            rng().gen_range(64..cmp::min(256, left))
         };
         let v: Vec<u8> = iter::repeat(0u8).take(vec_len).collect();
         storage.push(v);
Index: nix/Cargo.toml
===================================================================
--- nix.orig/Cargo.toml
+++ nix/Cargo.toml
@@ -140,7 +140,7 @@ version = "0.1"
 version = "0.12"
 
 [dev-dependencies.rand]
-version = "0.9"
+version = ">= 0.8.5, < 0.10"
 
 [dev-dependencies.semver]
 version = "1.0.7"