diff --git a/qg-cli/Cargo.toml b/qg-cli/Cargo.toml
index 54dafb8..c2dc01f 100644
--- a/qg-cli/Cargo.toml
+++ b/qg-cli/Cargo.toml
@@ -3,6 +3,7 @@
 author = "The Pigweed Authors"
 version = "0.1.0"
 edition = "2021"
+rust-version = "1.65"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/qg/Cargo.toml b/qg/Cargo.toml
index 911d92c..2745e2a 100644
--- a/qg/Cargo.toml
+++ b/qg/Cargo.toml
@@ -3,6 +3,7 @@
 version = "0.1.0"
 author = "The Pigweed Authors"
 edition = "2021"
+rust-version = "1.65"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html