diff --git a/README.md b/README.md
index 893db0a1a..87fd50922 100644
--- a/README.md
+++ b/README.md
@@ -67,11 +67,10 @@ Building Zebra requires [Rust](https://www.rust-lang.org/tools/install),
 [pkg-config](http://pkgconf.org/), and a C++ compiler.
 
 Zebra is tested with the latest `stable` Rust version. Earlier versions are not
-supported or tested. Note that Zebra's code currently uses features introduced
-in Rust 1.68, or any later stable release.
+supported or tested. Any Zebra release can start depending on new features in the
+latest stable Rust.
 
-Every few weeks, we release a [new Zebra
-version](https://github.com/ZcashFoundation/zebra/releases).
+Every few weeks, we release a [new Zebra version](https://github.com/ZcashFoundation/zebra/releases).
 
 Below are quick summaries for installing the dependencies on your machine.
 
diff --git a/zebrad/Cargo.toml b/zebrad/Cargo.toml
index 239dc1ead..71d57a0a4 100644
--- a/zebrad/Cargo.toml
+++ b/zebrad/Cargo.toml
@@ -9,9 +9,9 @@ repository = "https://github.com/ZcashFoundation/zebra"
 # Settings that impact compilation
 edition = "2021"
 
-# Zebra is only supported on the latest stable Rust version. Some earlier versions might work.
-# Zebra's code uses features introduced in Rust 1.68, or any later stable release.
-rust-version = "1.68"
+# Zebra is only supported on the latest stable Rust version. See the README for details.
+# Any Zebra release can break compatibility with older Rust versions.
+rust-version = "1.66"
 
 # Settings that impact runtime behaviour