diff --git a/Cargo.toml b/Cargo.toml
index 19de3e9cf77..f245fd06b67 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ version = "0.1.1"
 # x-release-please-end
 authors = ["The Noir Team <kevtheappdev@gmail.com>"]
 edition = "2021"
-rust-version = "1.64"
+rust-version = "1.66"
 
 [workspace.dependencies]
 acvm = "0.4.1"
diff --git a/README.md b/README.md
index c03b9de897e..eadda3ea2f5 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ Concretely the following items are on the road map:
 
 ## Minimum Rust version
 
-This crate's minimum supported rustc version is 1.64.0.
+This crate's minimum supported rustc version is 1.66.0.
 
 ## License
 
diff --git a/crates/nargo/build.rs b/crates/nargo/build.rs
index 21889d81b36..9bd33aab0e7 100644
--- a/crates/nargo/build.rs
+++ b/crates/nargo/build.rs
@@ -18,8 +18,8 @@ fn rerun_if_stdlib_changes(directory: &Path) {
 
 fn check_rustc_version() {
     assert!(
-        version().unwrap() >= Version::parse("1.6.4").unwrap(),
-        "The minimal supported rustc version is 1.64.0."
+        version().unwrap() >= Version::parse("1.66.0").unwrap(),
+        "The minimal supported rustc version is 1.66.0."
     );
 }