diff --git a/Cargo.toml b/Cargo.toml
index 2af52e25..6753ee01 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ license = "BSD-3-Clause"
 keywords = ["prolog", "prolog-interpreter", "prolog-system"]
 categories = ["command-line-utilities"]
 build = "build/main.rs"
-rust-version = "1.70"
+rust-version = "1.77"
 
 [lib]
 crate-type = ["cdylib", "rlib"]