diff --git a/examples/add/Cargo.toml b/examples/add/Cargo.toml
index 3d3d6db5..49c69f59 100644
--- a/examples/add/Cargo.toml
+++ b/examples/add/Cargo.toml
@@ -2,6 +2,7 @@
 name = "add"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]
diff --git a/examples/canvas/Cargo.toml b/examples/canvas/Cargo.toml
index 38207c67..e00b88f6 100644
--- a/examples/canvas/Cargo.toml
+++ b/examples/canvas/Cargo.toml
@@ -2,6 +2,7 @@
 name = "canvas"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]
diff --git a/examples/char/Cargo.toml b/examples/char/Cargo.toml
index 80e6c10c..41b8089c 100644
--- a/examples/char/Cargo.toml
+++ b/examples/char/Cargo.toml
@@ -2,6 +2,7 @@
 name = "char"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]
diff --git a/examples/hello_world/Cargo.toml b/examples/hello_world/Cargo.toml
index 887a0c1a..2a9832d9 100644
--- a/examples/hello_world/Cargo.toml
+++ b/examples/hello_world/Cargo.toml
@@ -2,6 +2,7 @@
 name = "hello_world"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]