diff --git a/crates/class-struct/Cargo.toml b/crates/class-struct/Cargo.toml
index d4548fd..ffbf29b 100644
--- a/crates/class-struct/Cargo.toml
+++ b/crates/class-struct/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "class-struct"
 version = "0.1.0"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/crates/file-info/Cargo.toml b/crates/file-info/Cargo.toml
index 2858488..94102bd 100644
--- a/crates/file-info/Cargo.toml
+++ b/crates/file-info/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "file-info"
 version = "0.1.0"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/crates/file-parser/Cargo.toml b/crates/file-parser/Cargo.toml
index f64f986..ad85e8a 100644
--- a/crates/file-parser/Cargo.toml
+++ b/crates/file-parser/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "file-parser"
 version = "0.1.0"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/crates/machine/Cargo.toml b/crates/machine/Cargo.toml
index 0b38822..16371df 100644
--- a/crates/machine/Cargo.toml
+++ b/crates/machine/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "machine"
 version = "0.1.0"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html