diff --git a/Cargo.toml b/Cargo.toml
index af9962f..b3495c1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,9 @@ version = "0.4.0"
 repository = "https://github.com/sksat/github-webhook-rs"
 authors = ["sksat <sksat@sksat.net>", "s-ylide"]
 
+# MSRV
+rust-version = "1.64.0"
+
 [workspace.dependencies]
 github-webhook-dts-downloader = { path = "./dts-downloader", version = "0.4" }
 github-webhook-type-generator = { path = "./type-generator", version = "0.4" }
diff --git a/dts-downloader/Cargo.toml b/dts-downloader/Cargo.toml
index 7ac3e91..fb33964 100644
--- a/dts-downloader/Cargo.toml
+++ b/dts-downloader/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "github-webhook-dts-downloader"
 version.workspace = true
+rust-version.workspace = true
 edition = "2021"
 
 description = "GitHub webhook payload type def downloader for Rust"
diff --git a/github-webhook/Cargo.toml b/github-webhook/Cargo.toml
index 8b3ea6c..2c4fd05 100644
--- a/github-webhook/Cargo.toml
+++ b/github-webhook/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "github-webhook"
 version.workspace = true
+rust-version.workspace = true
 edition = "2021"
 
 build = "build.rs"
diff --git a/type-generator/Cargo.toml b/type-generator/Cargo.toml
index 8976c17..ddd5b78 100644
--- a/type-generator/Cargo.toml
+++ b/type-generator/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "github-webhook-type-generator"
 version.workspace = true
+rust-version.workspace = true
 edition = "2021"
 
 description = "GitHub webhook payload type generator for Rust"