diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42311c0..2d3bef1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,7 +55,7 @@ jobs:
             rhysd/actionlint@sha256:b1934ee5f1c509618f2508e6eb47ee0d3520686341fec936f3b79331f9315667 \
             /work/ci.yml /work/release.yml
 
-      - uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         if: runner.os == 'Linux'
         with:
           dotnet-version: "8.0.x"
@@ -81,7 +81,7 @@ jobs:
         with:
           node-version: "22"
 
-      - uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         with:
           dotnet-version: "8.0.x"
 
diff --git a/.github/workflows/ppt-office-regression.yml b/.github/workflows/ppt-office-regression.yml
index 75a1207..7f63634 100644
--- a/.github/workflows/ppt-office-regression.yml
+++ b/.github/workflows/ppt-office-regression.yml
@@ -80,7 +80,7 @@ jobs:
         with:
           node-version: "22"
 
-      - uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
+      - uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
         with:
           dotnet-version: "8.0.x"