diff --git a/Cargo.toml b/Cargo.toml
index 7cf4ac7..467d63e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2024"
 license = "MIT"
 repository = "https://github.com/AdaWorldAPI/a2ui-rs"
 authors = ["AdaWorldAPI"]
-rust-version = "1.98.1"
+rust-version = "1.99.0"
 
 # ── The fork, named ONCE, with no version anywhere ───────────────────────────
 #
diff --git a/Dockerfile.railway b/Dockerfile.railway
index 161684c..45e2985 100644
--- a/Dockerfile.railway
+++ b/Dockerfile.railway
@@ -103,7 +103,7 @@
 # (1.98 -> 1.99), and never to a patch-level tag — that is the shape that
 # broke.
 
-ARG RUST_IMAGE_TAG=1.98.1-slim-bookworm
+ARG RUST_IMAGE_TAG=1.99.0-slim-bookworm
 ARG BIN_NAME=a2ui-paint-web
 
 # ── builder ────────────────────────────────────────────────────────────────
diff --git a/Dockerfile.solid.railway b/Dockerfile.solid.railway
index e114976..1cbac44 100644
--- a/Dockerfile.solid.railway
+++ b/Dockerfile.solid.railway
@@ -84,7 +84,7 @@
 # (1.98 -> 1.99), and never to a patch-level tag — that is the shape that
 # broke.
 
-ARG RUST_IMAGE_TAG=1.98.1-slim-bookworm
+ARG RUST_IMAGE_TAG=1.99.0-slim-bookworm
 ARG BIN_NAME=a2ui-solid-web
 
 # ── builder ────────────────────────────────────────────────────────────────
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 98d71fb..a640409 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.98.1"
+channel = "1.99.0"
 # The pinned version is the `channel` line ABOVE — deliberately not restated
 # in this comment, so a future bump touches one line rather than editing
 # prose that then drifts. (lance-graph's rust-toolchain.toml explains the