diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a4ba1ca86..4ecfcec01 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1071,7 +1071,10 @@ jobs:
       - name: Install cargo-hack, wasmtime
         uses: taiki-e/install-action@v2
         with:
-          tool: cargo-hack,wasmtime
+          # Wasmtime v46.0.1 is the last version to support
+          # `wasm32-wasip1-threads` (which was an experiment that was never
+          # standardized):
+          tool: cargo-hack,wasmtime@46.0.1
 
       - uses: Swatinem/rust-cache@v2
       - name: WASI test tokio full