diff --git a/Cargo.lock b/Cargo.lock
index 812ec397b..0f302867f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1631,7 +1631,7 @@ dependencies = [
  "bitflags 2.6.0",
  "crossterm_winapi",
  "libc",
- "mio",
+ "mio 0.8.11",
  "parking_lot",
  "signal-hook",
  "signal-hook-mio",
@@ -3459,6 +3459,18 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "mio"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80e04d1dcff3aae0704555fe5fee3bcfaf3d1fdf8a7e521d5b9d2b42acb52cec"
+dependencies = [
+ "hermit-abi 0.3.9",
+ "libc",
+ "wasi",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "mutants"
 version = "0.0.3"
@@ -3710,16 +3722,6 @@ dependencies = [
  "libm",
 ]
 
-[[package]]
-name = "num_cpus"
-version = "1.16.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
-dependencies = [
- "hermit-abi 0.3.9",
- "libc",
-]
-
 [[package]]
 name = "num_enum"
 version = "0.5.11"
@@ -5600,7 +5602,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "29ad2e15f37ec9a6cc544097b78a1ec90001e9f71b81338ca39f430adaca99af"
 dependencies = [
  "libc",
- "mio",
+ "mio 0.8.11",
  "signal-hook",
 ]
 
@@ -6039,28 +6041,27 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.38.0"
+version = "1.39.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba4f4a02a7a80d6f274636f0aa95c7e383b912d41fe721a31f29e29698585a4a"
+checksum = "daa4fb1bc778bd6f04cbfc4bb2d06a7396a8f299dc33ea1900cedaa316f467b1"
 dependencies = [
  "backtrace",
  "bytes",
  "libc",
- "mio",
- "num_cpus",
+ "mio 1.0.2",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
  "socket2 0.5.7",
  "tokio-macros",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
 name = "tokio-macros"
-version = "2.3.0"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f5ae998a069d4b5aba8ee9dad856af7d520c3699e6159b185c2acd48155d39a"
+checksum = "693d596312e88961bc67d7f1f97af8a70227d9f90c31bba5806eec004978d752"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index b856ddd61..2ae2d0bd6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -135,7 +135,7 @@ thiserror = "1.0.62"
 time = { version = "0.3.36", default-features = false }
 # Tokio is used for async test-running and for certain binaries.
 # The library crates do not require Tokio.
-tokio = { version = "1.28.0", default-features = false }
+tokio = { version = "1.39.2", default-features = false }
 trycmd = "0.15.4" # keep in sync with `snapbox`
 unicode-segmentation = { version = "1.10.1", default-features = false }
 unicode-width = { version = "0.1.9", default-features = false }