diff --git a/examples/plugin-for-example/Cargo.toml b/examples/plugin-for-example/Cargo.toml
index 28d234910..6df3389db 100644
--- a/examples/plugin-for-example/Cargo.toml
+++ b/examples/plugin-for-example/Cargo.toml
@@ -2,6 +2,7 @@
 name = "plugin-for-example"
 version = "0.1.0"
 authors = ["The Wasmer Engineering Team <enigneering@wasmer.io>"]
+license = "MIT"
 edition = "2018"
 
 [dependencies]
diff --git a/lib/kernel-loader/Cargo.toml b/lib/kernel-loader/Cargo.toml
index d1eab2f82..03149f6cd 100644
--- a/lib/kernel-loader/Cargo.toml
+++ b/lib/kernel-loader/Cargo.toml
@@ -2,6 +2,7 @@
 name = "wasmer-kernel-loader"
 version = "0.1.0"
 authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+license = "MIT"
 edition = "2018"
 
 [dependencies]
diff --git a/lib/kernel-net/Cargo.toml b/lib/kernel-net/Cargo.toml
index 28db6bf4d..f8242c899 100644
--- a/lib/kernel-net/Cargo.toml
+++ b/lib/kernel-net/Cargo.toml
@@ -2,6 +2,7 @@
 name = "kernel-net"
 version = "0.1.0"
 authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+license = "MIT"
 edition = "2018"
 
 [dependencies]
diff --git a/lib/llvm-backend-tests/Cargo.toml b/lib/llvm-backend-tests/Cargo.toml
index 11d357b24..606be406b 100644
--- a/lib/llvm-backend-tests/Cargo.toml
+++ b/lib/llvm-backend-tests/Cargo.toml
@@ -2,6 +2,7 @@
 name = "wasmer-llvm-backend-tests"
 version = "0.10.2"
 authors = ["Nick Lewycky <nick@wasmer.io>"]
+license = "MIT"
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/lib/wasi-experimental-io-devices/Cargo.toml b/lib/wasi-experimental-io-devices/Cargo.toml
index 5203783c0..8727ba805 100644
--- a/lib/wasi-experimental-io-devices/Cargo.toml
+++ b/lib/wasi-experimental-io-devices/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2018"
 repository = "https://github.com/wasmerio/wasmer"
 publish = true
 description = "An experimental non-standard WASI extension for graphics"
+license = "MIT"
 
 [badges]
 maintenance = { status = "experimental" }