diff --git a/Cargo.toml b/Cargo.toml
index 097fe7da..5b64f38d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,8 +49,8 @@ assert_cmd = "1"
 criterion = "0.3"
 libflate = "1"
 maplit = "1.0.1"
-pretty_assertions = "0.6"
-rand = { version = "0.7", features = ["small_rng"] }
+pretty_assertions = "0.7"
+rand = { version = "0.8", features = ["small_rng"] }
 testing_logger = "0.1.1"
 
 [profile.release]
diff --git a/src/collapse/dtrace.rs b/src/collapse/dtrace.rs
index 5afef211..1d47d4cb 100644
--- a/src/collapse/dtrace.rs
+++ b/src/collapse/dtrace.rs
@@ -513,10 +513,10 @@ mod tests {
         let inputs = common::testing::read_inputs(&INPUT)?;
 
         loop {
-            let nstacks_per_job = rng.gen_range(1, 500 + 1);
+            let nstacks_per_job = rng.gen_range(1..=500);
             let options = Options {
                 includeoffset: rng.gen(),
-                nthreads: rng.gen_range(2, 32 + 1),
+                nthreads: rng.gen_range(2..=32),
             };
 
             for (path, input) in inputs.iter() {
diff --git a/src/collapse/perf.rs b/src/collapse/perf.rs
index d6cf0889..a52d24d1 100644
--- a/src/collapse/perf.rs
+++ b/src/collapse/perf.rs
@@ -784,7 +784,7 @@ mod tests {
         let inputs = common::testing::read_inputs(&INPUT)?;
 
         loop {
-            let nstacks_per_job = rng.gen_range(1, 500 + 1);
+            let nstacks_per_job = rng.gen_range(1..=500);
             let options = Options {
                 annotate_jit: rng.gen(),
                 annotate_kernel: rng.gen(),
@@ -792,7 +792,7 @@ mod tests {
                 include_addrs: rng.gen(),
                 include_pid: rng.gen(),
                 include_tid: rng.gen(),
-                nthreads: rng.gen_range(2, 32 + 1),
+                nthreads: rng.gen_range(2..=32),
             };
 
             for (path, input) in inputs.iter() {