diff --git a/.github/workflows/dart-bindings.yml b/.github/workflows/dart-bindings.yml
index 96478c7..6f31ba9 100644
--- a/.github/workflows/dart-bindings.yml
+++ b/.github/workflows/dart-bindings.yml
@@ -34,7 +34,7 @@ jobs:
       # Pinned to match python-bindings.yml, same reasoning: a floating
       # toolchain turns an unrelated Rust release into a red gate on an
       # untouched branch.
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           components: rustfmt, clippy
 
@@ -87,7 +87,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           targets: ${{ matrix.target }}
 
@@ -131,7 +131,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
 
       - uses: Swatinem/rust-cache@v2
         with:
diff --git a/.github/workflows/parity.yml b/.github/workflows/parity.yml
index 7050655..4f7431c 100644
--- a/.github/workflows/parity.yml
+++ b/.github/workflows/parity.yml
@@ -33,7 +33,7 @@ jobs:
       # Must stay equal to `crates/rust-toolchain.toml`, for the same reason the
       # Rust workflow pins it: rustup reads that file inside `crates/`, so a
       # disagreement here installs one toolchain and builds with another.
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
 
       - uses: Swatinem/rust-cache@v2
         with:
diff --git a/.github/workflows/python-bindings.yml b/.github/workflows/python-bindings.yml
index 5b9b95d..86e9218 100644
--- a/.github/workflows/python-bindings.yml
+++ b/.github/workflows/python-bindings.yml
@@ -35,7 +35,7 @@ jobs:
       # Pinned to match crates/rust-toolchain.toml, same reasoning as rust.yml:
       # a floating toolchain turns an unrelated Rust release into a red gate on
       # an untouched branch.
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           components: rustfmt, clippy
 
@@ -77,7 +77,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
 
       - uses: actions/setup-python@v7
         with:
@@ -104,7 +104,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
 
       - uses: actions/setup-python@v7
         with:
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index aa4842e..0fa68e1 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -36,7 +36,7 @@ jobs:
       # an untouched branch. This must stay equal to `crates/rust-toolchain.toml`
       # — rustup reads that file inside `crates/`, so a disagreement here means
       # the runner installs one toolchain and cargo silently fetches another.
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           components: rustfmt, clippy
 
diff --git a/.github/workflows/wasm-bindings.yml b/.github/workflows/wasm-bindings.yml
index 9ccf886..9e62990 100644
--- a/.github/workflows/wasm-bindings.yml
+++ b/.github/workflows/wasm-bindings.yml
@@ -42,7 +42,7 @@ jobs:
       # patch, and the committed core-harness.js/.d.ts (deterministic; see the
       # drift check below) have to byte-match a build made with this exact
       # toolchain.
-      - uses: dtolnay/rust-toolchain@1.97.1
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           targets: wasm32-unknown-unknown