diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4aa9564..6a998a8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0 # fetch tags for publish
-
+    - uses: Swatinem/rust-cache@359a70e43a0bb8a13953b04a90f76428b4959bb6
     - run: cargo run -p xtask -- ci
       env:
         CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 2a5b66d..b3e2377 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -5,50 +5,50 @@ use std::time::Instant;
 
 use xshell::{cmd, Shell};
 
-const MSRV: &str = "1.56.0";
+// const MSRV: &str = "1.56.0";
 
 fn main() -> xshell::Result<()> {
     let sh = Shell::new()?;
 
     let _e = push_toolchain(&sh, "stable")?;
 
-    {
-        let _s = section("BUILD");
-        cmd!(sh, "cargo test --workspace --no-run").run()?;
-    }
-
-    {
-        let _s = section("TEST");
-
-        for &release in &[None, Some("--release")] {
-            cmd!(sh, "cargo test --features unstable {release...}").run()?;
-            cmd!(
-                sh,
-                "cargo test --no-default-features --features unstable,std,parking_lot {release...}"
-            )
-            .run()?;
-        }
-
-        // Skip doctests for no_std tests as those don't work
-        cmd!(sh, "cargo test --no-default-features --features unstable --test it").run()?;
-        cmd!(sh, "cargo test --no-default-features --features unstable,alloc --test it").run()?;
-
-        cmd!(sh, "cargo test --no-default-features --features critical-section").run()?;
-        cmd!(sh, "cargo test --features critical-section").run()?;
-    }
-
-    {
-        let _s = section("TEST_BETA");
-        let _e = push_toolchain(&sh, "beta")?;
-        cmd!(sh, "cargo test --features unstable").run()?;
-    }
-
-    {
-        let _s = section("TEST_MSRV");
-        let _e = push_toolchain(&sh, MSRV)?;
-        sh.copy_file("Cargo.lock.msrv", "Cargo.lock")?;
-        cmd!(sh, "cargo build").run()?;
-    }
+    // {
+    //     let _s = section("BUILD");
+    //     cmd!(sh, "cargo test --workspace --no-run").run()?;
+    // }
+
+    // {
+    //     let _s = section("TEST");
+
+    //     for &release in &[None, Some("--release")] {
+    //         cmd!(sh, "cargo test --features unstable {release...}").run()?;
+    //         cmd!(
+    //             sh,
+    //             "cargo test --no-default-features --features unstable,std,parking_lot {release...}"
+    //         )
+    //         .run()?;
+    //     }
+
+    //     // Skip doctests for no_std tests as those don't work
+    //     cmd!(sh, "cargo test --no-default-features --features unstable --test it").run()?;
+    //     cmd!(sh, "cargo test --no-default-features --features unstable,alloc --test it").run()?;
+
+    //     cmd!(sh, "cargo test --no-default-features --features critical-section").run()?;
+    //     cmd!(sh, "cargo test --features critical-section").run()?;
+    // }
+
+    // {
+    //     let _s = section("TEST_BETA");
+    //     let _e = push_toolchain(&sh, "beta")?;
+    //     cmd!(sh, "cargo test --features unstable").run()?;
+    // }
+
+    // {
+    //     let _s = section("TEST_MSRV");
+    //     let _e = push_toolchain(&sh, MSRV)?;
+    //     sh.copy_file("Cargo.lock.msrv", "Cargo.lock")?;
+    //     cmd!(sh, "cargo build").run()?;
+    // }
 
     {
         let _s = section("TEST_MIRI");
@@ -58,6 +58,10 @@ fn main() -> xshell::Result<()> {
         sh.remove_path("./target")?;
 
         cmd!(sh, "rustup component add miri").run()?;
+        cmd!(sh, "cargo --version").run()?;
+        let cargo = sh.var("CARGO");
+        eprintln!("cargo = {:?}", cargo);
+        cmd!(sh, "cargo miri --version").run()?;
         cmd!(sh, "cargo miri setup").run()?;
         cmd!(sh, "cargo miri test --features unstable").run()?;
     }