diff --git a/filtermail/.github/workflows/ci.yml b/filtermail/.github/workflows/ci.yml
index 8bcb24f6..d6e9c16c 100644
--- a/filtermail/.github/workflows/ci.yml
+++ b/filtermail/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9 # master
+      - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
         with:
           toolchain: nightly
           components: rustfmt
@@ -50,7 +50,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9 # master
+      - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
         with:
           toolchain: ${{ matrix.toolchain }}
           components: clippy
@@ -70,7 +70,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9 # master
+      - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
         with:
           toolchain: stable
       - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2
diff --git a/filtermail/.github/workflows/release.yml b/filtermail/.github/workflows/release.yml
index 271e7938..5ad6ac54 100644
--- a/filtermail/.github/workflows/release.yml
+++ b/filtermail/.github/workflows/release.yml
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9 # master
+      - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
         with:
           toolchain: stable
           targets: aarch64-unknown-linux-musl,x86_64-unknown-linux-musl