diff --git a/Cargo.lock b/Cargo.lock
index e7ea75fe8d..08bbe8f306 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -143,9 +143,9 @@ dependencies = [
 
 [[package]]
 name = "atomic-polyfill"
-version = "0.1.11"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3ff7eb3f316534d83a8a2c3d1674ace8a5a71198eba31e2e2b597833f699b28"
+checksum = "d299f547288d6db8d5c3a2916f7b2f66134b15b8c1ac1c4357dd3b8752af7bb2"
 dependencies = [
  "critical-section",
 ]
@@ -1593,7 +1593,7 @@ dependencies = [
 [[package]]
 name = "heapless"
 version = "0.8.0"
-source = "git+https://github.com/japaric/heapless.git?rev=340e0cec99a73759a5704f726c2fa3eed8fc3af6#340e0cec99a73759a5704f726c2fa3eed8fc3af6"
+source = "git+https://github.com/japaric/heapless.git?rev=644653bf3b831c6bb4963be2de24804acf5e5001#644653bf3b831c6bb4963be2de24804acf5e5001"
 dependencies = [
  "atomic-polyfill",
  "hash32",
diff --git a/Cargo.toml b/Cargo.toml
index 6538771fd7..a20442fbc3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,7 +46,7 @@ futures-core = "0.3"
 futures-util = "0.3"
 git-version = "0.3"
 hashbrown = "0.13"
-heapless = { default-features=false, features=[], git = "https://github.com/japaric/heapless.git", rev = "340e0cec99a73759a5704f726c2fa3eed8fc3af6" } # upstream release pending
+heapless = { default-features=false, features=[], git = "https://github.com/japaric/heapless.git", rev = "644653bf3b831c6bb4963be2de24804acf5e5001" } # upstream release pending
 hex = "0.4"
 hex-literal = "0.3"
 hmac = "0.12.1"