diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 9388b50..eb7e2b0 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "e40ec3e4243f95b39a42bcc9049551b62c3058a0"
+    "sha1": "ff9b0ef7ca5a93f8fb10baba52996e755500546f"
   }
 }
diff --git a/Android.bp b/Android.bp
index ef76cb6..44a3cf7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -126,20 +126,20 @@
 }
 
 // dependent_library ["feature_list"]
-//   async-stream-0.3.0
-//   async-stream-impl-0.3.0
+//   async-stream-0.3.1
+//   async-stream-impl-0.3.1
 //   autocfg-1.0.1
 //   bytes-1.0.1 "default,std"
 //   cfg-if-1.0.0
-//   futures-core-0.3.13 "alloc,default,std"
-//   futures-macro-0.3.13
-//   futures-task-0.3.13 "alloc,std"
-//   futures-util-0.3.13 "alloc,async-await,async-await-macro,default,futures-macro,proc-macro-hack,proc-macro-nested,slab,std"
+//   futures-core-0.3.15 "alloc,default,std"
+//   futures-macro-0.3.15
+//   futures-task-0.3.15 "alloc,std"
+//   futures-util-0.3.15 "alloc,async-await,async-await-macro,default,futures-macro,proc-macro-hack,proc-macro-nested,slab,std"
 //   instant-0.1.9
-//   libc-0.2.92 "default,std"
-//   lock_api-0.4.2
+//   libc-0.2.94 "default,std"
+//   lock_api-0.4.4
 //   log-0.4.14
-//   memchr-2.3.4 "default,std"
+//   memchr-2.4.0 "default,std"
 //   mio-0.7.11 "default,net,os-ext,os-poll,os-util,tcp,udp,uds"
 //   num_cpus-1.13.0
 //   once_cell-1.7.2 "alloc,default,race,std"
@@ -153,10 +153,10 @@
 //   quote-1.0.9 "default,proc-macro"
 //   scopeguard-1.1.0
 //   signal-hook-registry-1.3.0
-//   slab-0.4.2
+//   slab-0.4.3 "default,std"
 //   smallvec-1.6.1
-//   syn-1.0.68 "clone-impls,default,derive,extra-traits,full,parsing,printing,proc-macro,quote,visit-mut"
-//   tokio-1.4.0 "bytes,default,fs,full,io-std,io-util,libc,macros,memchr,mio,net,num_cpus,once_cell,parking_lot,process,rt,rt-multi-thread,signal,signal-hook-registry,sync,test-util,time,tokio-macros,winapi"
-//   tokio-macros-1.1.0
-//   tokio-stream-0.1.5 "default,time"
-//   unicode-xid-0.2.1 "default"
+//   syn-1.0.72 "clone-impls,default,derive,extra-traits,full,parsing,printing,proc-macro,quote,visit-mut"
+//   tokio-1.6.0 "bytes,default,fs,full,io-std,io-util,libc,macros,memchr,mio,net,num_cpus,once_cell,parking_lot,process,rt,rt-multi-thread,signal,signal-hook-registry,sync,test-util,time,tokio-macros,winapi"
+//   tokio-macros-1.2.0
+//   tokio-stream-0.1.6 "default,time"
+//   unicode-xid-0.2.2 "default"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fba3ce..5b1786f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 0.4.2 (May 14, 2021)
+
+- test: add `assert_elapsed!` macro ([#3728])
+
+[#3728]: https://github.com/tokio-rs/tokio/pull/3728
+
 # 0.4.1 (March 10, 2021)
 
 - Fix `io::Mock` to be `Send` and `Sync` ([#3594])
diff --git a/Cargo.toml b/Cargo.toml
index 6dc1d0c..1ebd109 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,11 +13,11 @@
 [package]
 edition = "2018"
 name = "tokio-test"
-version = "0.4.1"
+version = "0.4.2"
 authors = ["Tokio Contributors <team@tokio.rs>"]
 description = "Testing utilities for Tokio- and futures-based code\n"
 homepage = "https://tokio.rs"
-documentation = "https://docs.rs/tokio-test/0.4.1/tokio_test"
+documentation = "https://docs.rs/tokio-test/0.4.2/tokio_test"
 categories = ["asynchronous", "testing"]
 license = "MIT"
 repository = "https://github.com/tokio-rs/tokio"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 2691c89..55d5aaf 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -6,13 +6,13 @@
 #   - Cargo.toml
 # - Update CHANGELOG.md.
 # - Create "tokio-test-0.4.x" git tag.
-version = "0.4.1"
+version = "0.4.2"
 edition = "2018"
 authors = ["Tokio Contributors <team@tokio.rs>"]
 license = "MIT"
 repository = "https://github.com/tokio-rs/tokio"
 homepage = "https://tokio.rs"
-documentation = "https://docs.rs/tokio-test/0.4.1/tokio_test"
+documentation = "https://docs.rs/tokio-test/0.4.2/tokio_test"
 description = """
 Testing utilities for Tokio- and futures-based code
 """
diff --git a/LICENSE b/LICENSE
index 243fcd6..ffa38bb 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2020 Tokio Contributors
+Copyright (c) 2021 Tokio Contributors
 
 Permission is hereby granted, free of charge, to any
 person obtaining a copy of this software and associated
diff --git a/METADATA b/METADATA
index 22032a7..f1e1ef3 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/tokio-test/tokio-test-0.4.1.crate"
+    value: "https://static.crates.io/crates/tokio-test/tokio-test-0.4.2.crate"
   }
-  version: "0.4.1"
+  version: "0.4.2"
   license_type: NOTICE
   last_upgrade_date {
     year: 2021
-    month: 4
-    day: 2
+    month: 5
+    day: 19
   }
 }
diff --git a/src/macros.rs b/src/macros.rs
index 299bd77..7ca7345 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -259,3 +259,37 @@
         }
     }};
 }
+
+/// Asserts that an exact duration has elapsed since since the start instant ±1ms.
+///
+/// ```rust
+/// use tokio::time::{self, Instant};
+/// use std::time::Duration;
+/// use tokio_test::assert_elapsed;
+/// # async fn test_time_passed() {
+///
+/// let start = Instant::now();
+/// let dur = Duration::from_millis(50);
+/// time::sleep(dur).await;
+/// assert_elapsed!(start, dur);
+/// # }
+/// ```
+///
+/// This 1ms buffer is required because Tokio's hashed-wheel timer has finite time resolution and
+/// will not always sleep for the exact interval.
+#[macro_export]
+macro_rules! assert_elapsed {
+    ($start:expr, $dur:expr) => {{
+        let elapsed = $start.elapsed();
+        // type ascription improves compiler error when wrong type is passed
+        let lower: std::time::Duration = $dur;
+
+        // Handles ms rounding
+        assert!(
+            elapsed >= lower && elapsed <= lower + std::time::Duration::from_millis(1),
+            "actual = {:?}, expected = {:?}",
+            elapsed,
+            lower
+        );
+    }};
+}