diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7233be6..23ddfb9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -79,7 +79,8 @@ jobs:
       - run: cargo miri test
         env:
           # -Zmiri-ignore-leaks is needed because we use detached threads in doctests
-          MIRIFLAGS: -Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-ignore-leaks
+          # TODO: remove -Zmiri-disable-weak-memory-emulation
+          MIRIFLAGS: -Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-disable-weak-memory-emulation -Zmiri-ignore-leaks
           RUSTFLAGS: ${{ env.RUSTFLAGS }} -Z randomize-layout
 
   security_audit:
diff --git a/tests/rwlock.rs b/tests/rwlock.rs
index 40a3350..c95fa0b 100644
--- a/tests/rwlock.rs
+++ b/tests/rwlock.rs
@@ -94,7 +94,7 @@ fn get_mut() {
 #[test]
 fn contention() {
     const N: u32 = 10;
-    const M: usize = 1000;
+    const M: usize = if cfg!(miri) { 100 } else { 1000 };
 
     let (tx, rx) = async_channel::unbounded();
     let tx = Arc::new(tx);