diff --git a/crates/aiken-lang/Cargo.toml b/crates/aiken-lang/Cargo.toml
index f66f22d4..3a3a7931 100644
--- a/crates/aiken-lang/Cargo.toml
+++ b/crates/aiken-lang/Cargo.toml
@@ -1,14 +1,13 @@
 [package]
 name = "aiken-lang"
-description = "The aiken compiler"
+description = "The Aiken compiler"
 version = "0.0.29"
 edition = "2021"
 repository = "https://github.com/aiken-lang/aiken"
 homepage = "https://github.com/aiken-lang/aiken"
 license = "Apache-2.0"
 authors = ["Lucas Rosa <x@rvcas.dev>", "Kasey White <kwhitemsg@gmail.com>"]
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+rust-version = "1.66.1"
 
 [dependencies]
 chumsky = "0.9.2"
diff --git a/crates/aiken-lsp/Cargo.toml b/crates/aiken-lsp/Cargo.toml
index 324a22ca..e1bee055 100644
--- a/crates/aiken-lsp/Cargo.toml
+++ b/crates/aiken-lsp/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/aiken-lang/aiken"
 homepage = "https://github.com/aiken-lang/aiken"
 license = "Apache-2.0"
 authors = ["Lucas Rosa <x@rvcas.dev>"]
-
+rust-version = "1.66.1"
 
 [dependencies]
 aiken-lang = { path = '../aiken-lang', version = "0.0.29" }
diff --git a/crates/aiken-project/Cargo.toml b/crates/aiken-project/Cargo.toml
index f972900a..94683ca8 100644
--- a/crates/aiken-project/Cargo.toml
+++ b/crates/aiken-project/Cargo.toml
@@ -7,6 +7,7 @@ repository = "https://github.com/aiken-lang/aiken/crates/project"
 homepage = "https://github.com/aiken-lang/aiken"
 license = "Apache-2.0"
 authors = ["Lucas Rosa <x@rvcas.dev>", "Kasey White <kwhitemsg@gmail.com>"]
+rust-version = "1.66.1"
 
 [dependencies]
 aiken-lang = { path = "../aiken-lang", version = "0.0.29" }
diff --git a/crates/aiken/Cargo.toml b/crates/aiken/Cargo.toml
index 9d152121..d2246520 100644
--- a/crates/aiken/Cargo.toml
+++ b/crates/aiken/Cargo.toml
@@ -7,6 +7,7 @@ repository = "https://github.com/aiken-lang/aiken"
 homepage = "https://github.com/aiken-lang/aiken"
 license = "Apache-2.0"
 authors = ["Lucas Rosa <x@rvcas.dev>", "Kasey White <kwhitemsg@gmail.com>"]
+rust-version = "1.66.1"
 
 [dependencies]
 anyhow = "1.0.69"
diff --git a/crates/flat-rs/Cargo.toml b/crates/flat-rs/Cargo.toml
index 73ef0604..1ca215a5 100644
--- a/crates/flat-rs/Cargo.toml
+++ b/crates/flat-rs/Cargo.toml
@@ -7,8 +7,7 @@ repository = "https://github.com/aiken-lang/aiken/crates/flat"
 homepage = "https://github.com/aiken-lang/aiken"
 license = "Apache-2.0"
 authors = ["Lucas Rosa <x@rvcas.dev>", "Kasey White <kwhitemsg@gmail.com>"]
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+rust-version = "1.66.1"
 
 [dependencies]
 anyhow = "1.0.69"
diff --git a/crates/uplc/Cargo.toml b/crates/uplc/Cargo.toml
index 48fb7c3a..1d83cda6 100644
--- a/crates/uplc/Cargo.toml
+++ b/crates/uplc/Cargo.toml
@@ -7,11 +7,9 @@ repository = "https://github.com/aiken-lang/aiken/crates/uplc"
 homepage = "https://github.com/aiken-lang/aiken"
 license = "Apache-2.0"
 authors = ["Lucas Rosa <x@rvcas.dev>", "Kasey White <kwhitemsg@gmail.com>"]
-
+rust-version = "1.66.1"
 exclude = ["test_data/*"]
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 anyhow = "1.0.69"
 cryptoxide = "0.4.4"