diff --git a/manual/src/from_source.md b/manual/src/from_source.md
index a7204b2e0..d2488f595 100644
--- a/manual/src/from_source.md
+++ b/manual/src/from_source.md
@@ -4,7 +4,7 @@
 
 Difftastic is written in Rust, so you will need Rust installed. I
 recommend [rustup](https://rustup.rs/) to install Rust. Difftastic
-requires Rust version 1.66 or later.
+requires Rust version 1.74.1 or later.
 
 You will also need a C++ compiler that supports C++14. If you're using
 GCC, you need at least version 8.