diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44f17e6086..2f82e9024c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -187,7 +187,9 @@ jobs:
 
         rust_channel:
           - stable
-          - nightly
+          # Work around failure to link on aarch64-apple-darwin in later
+          # nightly toolchains.
+          - nightly-2021-08-13
           - 1.52.1 # MSRV
           - beta