diff --git a/.ci/test-coverage.yml b/.ci/test-coverage.yml
index 7ccc106564f..e0800bb6bf3 100644
--- a/.ci/test-coverage.yml
+++ b/.ci/test-coverage.yml
@@ -52,14 +52,14 @@ jobs:
       uses: cache@1.*
       with:
         cachePaths: swiftshader-install
-        cacheKey: swiftshader-linux-install-20230420-1
+        cacheKey: swiftshader-linux-install-20240622
 
     - name: checkout-swiftshader
       if: steps.cache-swiftshader.outputs.cacheHit != 'true'
       checkout: https://github.com/google/swiftshader.git
       with:
         pullType: COMMIT_ID
-        refName: dd55e592406dc0bae219df11adec6363840aff4a
+        refName: de870ac7518fe2b6bb651ecc22fc36647cf7b986
         localPath: swiftshader
         enableSubmodule: false
         enableGitLfs: false
diff --git a/tests/test_multiheadattention.cpp b/tests/test_multiheadattention.cpp
index 6dd108d0315..5f110284ca7 100644
--- a/tests/test_multiheadattention.cpp
+++ b/tests/test_multiheadattention.cpp
@@ -106,7 +106,7 @@ static int test_multiheadattention_sameqkv(const ncnn::Mat& a, int embed_dim, in
     pd.set(2, embed_dim * qdim);
     pd.set(3, qdim);
     pd.set(4, qdim);
-    pd.set(6, 2.f / sqrtf(embed_dim / num_heads));
+    pd.set(6, 0.7f / sqrtf(embed_dim / num_heads));
 
     std::vector<ncnn::Mat> weights(8);
     weights[0] = RandomMat(embed_dim * qdim);