diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 327ae014..9f4dd5f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -158,9 +158,7 @@ jobs:
           - stable
           - nightly
 
-          # MSRV: webpki builds and works with Rust 1.47 and later. The
-          # rcgen-based test requires 1.67.0 or later.
-          - 1.67.0
+          - 1.61.0
 
           - beta
 
diff --git a/Cargo.toml b/Cargo.toml
index 327d158e..4ce94fa1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ license-file = "LICENSE"
 name = "webpki"
 readme = "README.md"
 repository = "https://github.com/briansmith/webpki"
+rust-version = "1.61.0"
 version = "0.22.2"
 
 include = [