diff --git a/.github/workflows/blake2.yml b/.github/workflows/blake2.yml
index ed5eba91..5df981b7 100644
--- a/.github/workflows/blake2.yml
+++ b/.github/workflows/blake2.yml
@@ -68,17 +68,18 @@ jobs:
         working-directory: ${{ github.workflow }}
         stable-cmd: cargo hack test --release --feature-powerset --exclude-features simd,simd_opt,simd_asm
 
-  simd:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: RustCrypto/actions/cargo-cache@master
-      - uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: nightly-2021-05-01
-      - run: cargo test --features simd
-      - run: cargo test --features simd_opt
-      - run: cargo test --features simd_asm
+# No longer builds on recent nightlies
+#  simd:
+#    runs-on: ubuntu-latest
+#    steps:
+#      - uses: actions/checkout@v4
+#      - uses: RustCrypto/actions/cargo-cache@master
+#      - uses: dtolnay/rust-toolchain@master
+#        with:
+#          toolchain: nightly-2021-05-01
+#      - run: cargo test --features simd
+#      - run: cargo test --features simd_opt
+#      - run: cargo test --features simd_asm
 
   # Cross-compiled tests
   cross: