diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index f5c69049..0b91db9e 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -21,14 +21,25 @@ jobs:
     - name: Check style
       run: cargo fmt -- --check
 
-  build-and-test:
+  test:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        rust: [stable]
+        include:
+          - os: ubuntu-latest
+            rust: nightly
     steps:
-    - uses: actions/checkout@v2
-    - name: Build
-      run: cargo build --locked --tests --verbose
-    - name: Run tests
-      run: cargo test --locked --verbose
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - run: cargo test --all-features --locked --verbose
+
+  msrv:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: taiki-e/install-action@cargo-hack
+      - run: cargo hack --no-dev-deps --rust-version check --package typify
diff --git a/Cargo.toml b/Cargo.toml
index 37c2c943..5c80980e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,9 @@ members = [
 
 resolver = "2"
 
+[workspace.package]
+rust-version = "1.88.0"
+
 [workspace.dependencies]
 typify = { version = "0.5.0", path = "typify" }
 typify-impl = { version = "0.5.0", path = "typify-impl" }
diff --git a/cargo-typify/Cargo.toml b/cargo-typify/Cargo.toml
index d09cdd54..3b58e787 100644
--- a/cargo-typify/Cargo.toml
+++ b/cargo-typify/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/oxidecomputer/typify"
 readme = "README.md"
 keywords = ["json", "schema", "cargo"]
 categories = ["api-bindings", "compilers"]
+rust-version.workspace = true
 
 default-run = "cargo-typify"
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
deleted file mode 100644
index 65c0d610..00000000
--- a/rust-toolchain.toml
+++ /dev/null
@@ -1,3 +0,0 @@
-[toolchain]
-channel = "1.89.0"
-profile = "default"
diff --git a/typify-impl/Cargo.toml b/typify-impl/Cargo.toml
index 11cdb3f1..ed807993 100644
--- a/typify-impl/Cargo.toml
+++ b/typify-impl/Cargo.toml
@@ -6,6 +6,7 @@ license = "Apache-2.0"
 description = "typify backend implementation"
 repository = "https://github.com/oxidecomputer/typify"
 readme = "../README.md"
+rust-version.workspace = true
 
 [dependencies]
 heck = { workspace = true }
diff --git a/typify-macro/Cargo.toml b/typify-macro/Cargo.toml
index acf12bf6..64199f1c 100644
--- a/typify-macro/Cargo.toml
+++ b/typify-macro/Cargo.toml
@@ -6,6 +6,7 @@ license = "Apache-2.0"
 description = "typify macro implementation"
 repository = "https://github.com/oxidecomputer/typify"
 readme = "../README.md"
+rust-version.workspace = true
 
 [lib]
 proc-macro = true
diff --git a/typify-test/Cargo.toml b/typify-test/Cargo.toml
index 8e134288..46f4754c 100644
--- a/typify-test/Cargo.toml
+++ b/typify-test/Cargo.toml
@@ -2,10 +2,11 @@
 name = "typify-test"
 version = "0.0.0"
 edition = "2021"
+rust-version.workspace = true
 
 [dependencies]
 regress = { workspace = true }
-serde = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 
 [build-dependencies]
@@ -14,5 +15,5 @@ typify = { path = "../typify" }
 ipnetwork = { workspace = true }
 prettyplease = { workspace = true }
 schemars = { workspace = true }
-serde = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
 syn = { workspace = true }
diff --git a/typify/Cargo.toml b/typify/Cargo.toml
index 534f1fa8..f582a2c9 100644
--- a/typify/Cargo.toml
+++ b/typify/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/oxidecomputer/typify"
 readme = "../README.md"
 keywords = ["json", "schema", "proc_macro"]
 categories = ["api-bindings", "compilers"]
+rust-version.workspace = true
 
 [features]
 default = ["macro"]