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diff --git a/tests/test-func-with-hooks/Cargo.toml b/tests/test-func-with-hooks/Cargo.toml
index b015e66..56b410d 100644
--- a/tests/test-func-with-hooks/Cargo.toml
+++ b/tests/test-func-with-hooks/Cargo.toml
@@ -1,8 +1,11 @@
 [package]
 name = "test-func-with-hooks"
-version = "0.1.0"
-authors = ["Bernardo Belchior <bernardo.belchior1@gmail.com>"]
-edition = "2018"
+version = "0.2.0"
+authors = [
+    "Bernardo Belchior <bernardo.belchior1@gmail.com>",
+    "jerusdp <jrussell@jerus.ie>"
+    ]
+edition = "2021"
 
 # users don't have to do this
 # but when they do, the builder packaging still work
@@ -11,5 +14,6 @@ name = "bootstrap"
 path = "src/main.rs"
 
 [dependencies]
-lambda_runtime = "0.2"
-serde_json = "1.0"
\ No newline at end of file
+lambda_runtime = "0.4"
+serde_json = "1.0"
+tokio = "1.14"
\ No newline at end of file
diff --git a/tests/test-func-with-hooks/src/main.rs b/tests/test-func-with-hooks/src/main.rs
index 1bad45e..8327b2f 100644
--- a/tests/test-func-with-hooks/src/main.rs
+++ b/tests/test-func-with-hooks/src/main.rs
@@ -1,16 +1,18 @@
-use lambda_runtime::{error::HandlerError, lambda, Context};
+use lambda_runtime::{Error, Context};
 use serde_json::Value;
 use std::fs::File;
 use std::io::Read;
 
-fn main() {
-    lambda!(handler)
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    lambda_runtime::run(lambda_runtime::handler_fn(handler)).await?;
+    Ok(())
 }
 
-fn handler(
+async fn handler(
     _event: Value,
     _: Context,
-) -> Result<Value, HandlerError> {
+) -> Result<Value, Error> {
     let mut file = File::open("/var/task/output.log").unwrap();
     let mut contents = String::new();
     file.read_to_string(&mut contents).unwrap();
diff --git a/tests/test-func/Cargo.lock b/tests/test-func/Cargo.lock
index cd3fd5a..13e011a 100644
--- a/tests/test-func/Cargo.lock
+++ b/tests/test-func/Cargo.lock
@@ -1,1019 +1,590 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
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-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "171374e7e3b2504e0e5236e3b59260560f9fe94bfe9ac39ba5e4e929c5590625"
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- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "async-stream-impl",
+ "futures-core",
 ]
 
 [[package]]
-name = "backtrace-sys"
-version = "0.1.32"
+name = "async-stream-impl"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
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-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
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-version = "1.3.2"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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-]
-
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-
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-
-[[package]]
-name = "crossbeam-epoch"
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+name = "cfg-if"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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- "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
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-version = "0.1.2"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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-"checksum syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)" = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
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-"checksum tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "5090db468dad16e1a7a54c8c67280c5e4b544f3d3e018f0b913b400261f85926"
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-"checksum tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1d14b10654be682ac43efee27401d792507e30fd8d26389e1da3b185de2e4119"
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-"checksum tokio-udp 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "f02298505547f73e60f568359ef0d016d5acd6e830ab9bc7c4a5b3403440121b"
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-"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
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-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
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diff --git a/tests/test-func/Cargo.toml b/tests/test-func/Cargo.toml
index bc1afd1..73fd37b 100644
--- a/tests/test-func/Cargo.toml
+++ b/tests/test-func/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "test-func"
-version = "0.1.0"
-authors = ["softprops <d.tangren@gmail.com>"]
-edition = "2018"
+version = "0.2.0"
+authors = ["softprops <d.tangren@gmail.com>", "jerusdp <jrussell@jerus.ie>"]
+edition = "2021"
 
 # users don't have to do this
 # but when they do, the builder packaging still work
@@ -11,5 +11,6 @@ name = "bootstrap"
 path = "src/main.rs"
 
 [dependencies]
-lambda_runtime = "0.2"
-serde_json = "1.0"
\ No newline at end of file
+lambda_runtime = "0.4"
+serde_json = "1.0"
+tokio = "1.14"
\ No newline at end of file
diff --git a/tests/test-func/src/main.rs b/tests/test-func/src/main.rs
index f38c7c6..34defa9 100644
--- a/tests/test-func/src/main.rs
+++ b/tests/test-func/src/main.rs
@@ -1,13 +1,12 @@
-use lambda_runtime::{error::HandlerError, lambda, Context};
+use lambda_runtime::{Error,Context};
 use serde_json::Value;
 
-fn main() {
-    lambda!(handler)
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    lambda_runtime::run(lambda_runtime::handler_fn(handler)).await?;
+    Ok(())
 }
 
-fn handler(
-    event: Value,
-    _: Context,
-) -> Result<Value, HandlerError> {
+async fn handler(event: Value, _: Context) -> Result<Value, Error> {
     Ok(event)
-}
\ No newline at end of file
+}
diff --git a/tests/test-multi-func/Cargo.lock b/tests/test-multi-func/Cargo.lock
index cd3fd5a..c83a1ba 100644
--- a/tests/test-multi-func/Cargo.lock
+++ b/tests/test-multi-func/Cargo.lock
@@ -1,1019 +1,590 @@
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 # It is not intended for manual editing.
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- "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "async-stream-impl",
+ "futures-core",
 ]
 
 [[package]]
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- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "quote",
+ "syn",
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-
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+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
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- "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
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+ "futures-sink",
+ "futures-task",
+ "futures-util",
 ]
 
 [[package]]
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- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core",
+ "futures-sink",
 ]
 
 [[package]]
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-version = "1.5.3"
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 [[package]]
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- "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core",
+ "futures-task",
+ "futures-util",
 ]
 
 [[package]]
-name = "failure_derive"
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+name = "futures-io"
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 [[package]]
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-
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- "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg",
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
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 [[package]]
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- "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "futures-macro",
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+ "memchr",
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+ "pin-utils",
+ "proc-macro-hack",
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diff --git a/tests/test-multi-func/foo/Cargo.toml b/tests/test-multi-func/foo/Cargo.toml
index 2a883ca..c33cb5e 100644
--- a/tests/test-multi-func/foo/Cargo.toml
+++ b/tests/test-multi-func/foo/Cargo.toml
@@ -1,9 +1,10 @@
 [package]
 name = "test-func"
-version = "0.1.0"
-authors = ["softprops <d.tangren@gmail.com>"]
-edition = "2018"
+version = "0.2.0"
+authors = ["softprops <d.tangren@gmail.com>", "jerusdp <jrussell@jerus.ie>"]
+edition = "2021"
 
 [dependencies]
-lambda_runtime = "0.2"
-serde_json = "1.0"
\ No newline at end of file
+lambda_runtime = "0.4"
+serde_json = "1.0"
+tokio = "1.14"
\ No newline at end of file
diff --git a/tests/test-multi-func/foo/src/main.rs b/tests/test-multi-func/foo/src/main.rs
index f38c7c6..7f83a6f 100644
--- a/tests/test-multi-func/foo/src/main.rs
+++ b/tests/test-multi-func/foo/src/main.rs
@@ -1,13 +1,15 @@
-use lambda_runtime::{error::HandlerError, lambda, Context};
+use lambda_runtime::{Error, Context};
 use serde_json::Value;
 
-fn main() {
-    lambda!(handler)
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    lambda_runtime::run(lambda_runtime::handler_fn(handler)).await?;
+    Ok(())
 }
 
-fn handler(
+async fn handler(
     event: Value,
     _: Context,
-) -> Result<Value, HandlerError> {
+) -> Result<Value, Error> {
     Ok(event)
 }
\ No newline at end of file