diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b9a8b1c4..4e901826 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Install Rust toolchain (per rust-toolchain.toml)
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.97.1
+          toolchain: 1.98.1
           components: rustfmt, clippy
       - uses: Swatinem/rust-cache@v2
       - name: cargo check --workspace --all-targets
diff --git a/crates/ogar-a2ui-frame/src/lib.rs b/crates/ogar-a2ui-frame/src/lib.rs
index b7ae440c..53b66306 100644
--- a/crates/ogar-a2ui-frame/src/lib.rs
+++ b/crates/ogar-a2ui-frame/src/lib.rs
@@ -245,8 +245,10 @@ impl Frame {
                     });
                 }
                 let mask_words = payload[FIXED..mask_end]
-                    .chunks_exact(8)
-                    .map(|c| u64::from_le_bytes([c[0], c[1], c[2], c[3], c[4], c[5], c[6], c[7]]))
+                    .as_chunks::<8>()
+                    .0
+                    .iter()
+                    .map(|c| u64::from_le_bytes(*c))
                     .collect();
                 Ok(Self::NodeDelta(NodeDelta {
                     key,
diff --git a/crates/ogar-r2il/examples/probe_counterfactual_witness_kernel.rs b/crates/ogar-r2il/examples/probe_counterfactual_witness_kernel.rs
index b9896998..5be46a2f 100644
--- a/crates/ogar-r2il/examples/probe_counterfactual_witness_kernel.rs
+++ b/crates/ogar-r2il/examples/probe_counterfactual_witness_kernel.rs
@@ -45,7 +45,7 @@
 //! - G1: segmentation is GREEN over the mixed core+R2IL body, and the edit
 //!   is CONFINED: outside the edited statement's `CallMask`, the projected
 //!   calls of factual and counterfactual slabs are identical; inside, they
-//!    differ (the lens proves locality — can-fire + can-stay-silent).
+//!   differ (the lens proves locality — can-fire + can-stay-silent).
 //! - G2a (CF-1a intra-run swap): byte > 0, exact-area > 0, increment == 0
 //!   (net per-locus counts unchanged — increments are structurally blind
 //!   to dataflow order), register == 0 — the orientation bit is
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 5ec58696..c9901407 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.97.1"
+channel = "1.98.1"
 components = ["rustfmt", "clippy"]
 profile = "minimal"