diff --git a/.github/workflows/latest_deps.yml b/.github/workflows/latest_deps.yml
index c3705b059b..452600ba16 100644
--- a/.github/workflows/latest_deps.yml
+++ b/.github/workflows/latest_deps.yml
@@ -27,9 +27,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-          toolchain: stable
+        uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
 
       # The dev dependencies aren't exposed in the wheel metadata (at least with current
@@ -61,9 +59,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-          toolchain: stable
+        uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
 
       - run: sudo apt-get -qq install xmlsec1
@@ -134,9 +130,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-          toolchain: stable
+        uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
 
       - name: Ensure sytest runs `pip install`
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f895163e51..f01342c8b7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -35,12 +35,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
       - uses: matrix-org/setup-python-poetry@v1
         with:
@@ -104,12 +99,7 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
       - uses: matrix-org/setup-python-poetry@v1
         with:
@@ -126,12 +116,8 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
+        uses: dtolnay/rust-toolchain@1.58.1
         with:
-            toolchain: 1.58.1
             components: clippy
       - uses: Swatinem/rust-cache@v2
 
@@ -148,10 +134,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
+        uses: dtolnay/rust-toolchain@master
         with:
             toolchain: nightly-2022-12-01
             components: clippy
@@ -168,10 +151,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
+        uses: dtolnay/rust-toolchain@master
         with:
           # We use nightly so that it correctly groups together imports
           toolchain: nightly-2022-12-01
@@ -236,12 +216,7 @@ jobs:
             postgres:${{ matrix.job.postgres-version }}
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
 
       - uses: matrix-org/setup-python-poetry@v1
@@ -281,12 +256,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
 
       # There aren't wheels for some of the older deps, so we need to install
@@ -402,12 +372,7 @@ jobs:
         run: cat sytest-blacklist .ci/worker-blacklist > synapse-blacklist-with-workers
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
 
       - name: Run SyTest
@@ -547,12 +512,7 @@ jobs:
           path: synapse
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
 
       - uses: actions/setup-go@v4
@@ -580,12 +540,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-            toolchain: 1.58.1
+        uses: dtolnay/rust-toolchain@1.58.1
       - uses: Swatinem/rust-cache@v2
 
       - run: cargo test
@@ -603,10 +558,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        # There don't seem to be versioned releases of this action per se: for each rust
-        # version there is a branch which gets constantly rebased on top of master.
-        # We pin to a specific commit for paranoia's sake.
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
+        uses: dtolnay/rust-toolchain@master
         with:
             toolchain: nightly-2022-12-01
       - uses: Swatinem/rust-cache@v2
diff --git a/.github/workflows/twisted_trunk.yml b/.github/workflows/twisted_trunk.yml
index ad35c6b570..14fc6a0389 100644
--- a/.github/workflows/twisted_trunk.yml
+++ b/.github/workflows/twisted_trunk.yml
@@ -25,9 +25,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-          toolchain: stable
+        uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
 
       - uses: matrix-org/setup-python-poetry@v1
@@ -50,9 +48,7 @@ jobs:
       - run: sudo apt-get -qq install xmlsec1
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-          toolchain: stable
+        uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
 
       - uses: matrix-org/setup-python-poetry@v1
@@ -89,9 +85,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@fc3253060d0c959bea12a59f10f8391454a0b02d
-        with:
-          toolchain: stable
+        uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
 
       - name: Patch dependencies
diff --git a/changelog.d/15406.misc b/changelog.d/15406.misc
new file mode 100644
index 0000000000..d2f9eb0dd4
--- /dev/null
+++ b/changelog.d/15406.misc
@@ -0,0 +1 @@
+Trust dtonlay/rust-toolchain in CI.