diff --git a/finny_nostd_tests/Cargo.toml b/finny_nostd_tests/Cargo.toml
index d047925..2b2f984 100644
--- a/finny_nostd_tests/Cargo.toml
+++ b/finny_nostd_tests/Cargo.toml
@@ -8,7 +8,7 @@ publish = false
 [dependencies]
 libc = { version = "0.2", default-features = false }
 finny = { path = "../finny/", default-features = false }
-heapless = "0.5.6"
+heapless = "0.6.1"
 
 [profile.dev]
 panic = "abort" # disable stack unwinding on panic