diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 306f36e..2e513d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,7 +4,6 @@ on:
   push:
   pull_request:
   workflow_dispatch:
-  schedule: [cron: "0 1 1 * *"]
 
 permissions:
   contents: read
@@ -14,12 +13,8 @@ env:
 
 jobs:
   test:
-    name: Rust ${{matrix.rust}}
+    name: Rust stable
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        rust: [nightly, beta, stable]
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v3
diff --git a/src/lib.rs b/src/lib.rs
index 796c1a2..47f4370 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,6 +41,8 @@
 //!
 //! ```
 
+#![cfg_attr(not(feature = "std"), no_std)]
+
 #[macro_export]
 macro_rules! serde_default {
     ($kind:ty) => {