diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ba86ae3..788a483 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,32 +48,26 @@ jobs:
             target: i686-pc-windows-msvc
             runner: windows-2025-vs2026
             artifact: rd_pipe-x86
-            toolchain: stable
           - name: x64
             target: x86_64-pc-windows-msvc
             runner: windows-2025-vs2026
             artifact: rd_pipe-x64
-            toolchain: stable
           - name: arm64
             target: aarch64-pc-windows-msvc
             runner: windows-11-arm
             artifact: rd_pipe-arm64
-            toolchain: beta
           - name: arm64ec
             target: arm64ec-pc-windows-msvc
             runner: windows-11-arm
             artifact: rd_pipe-arm64ec
-            toolchain: beta
           - name: arm64x-on-arm64
             target: aarch64-pc-windows-msvc
             runner: windows-11-arm
             artifact: rd_pipe-arm64x
-            toolchain: beta
           - name: arm64x-on-arm64ec
             target: arm64ec-pc-windows-msvc
             runner: windows-11-arm
             artifact: rd_pipe-arm64x
-            toolchain: beta
 
     steps:
       - uses: actions/checkout@v7
@@ -81,7 +75,7 @@ jobs:
       - name: Install rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.toolchain }}
+          toolchain: stable
           target: ${{ matrix.target }}
 
       - uses: Swatinem/rust-cache@v2
@@ -124,16 +118,12 @@ jobs:
         include:
           - target: i686-pc-windows-msvc
             suffix: x86
-            toolchain: stable
           - target: x86_64-pc-windows-msvc
             suffix: x64
-            toolchain: stable
           - target: aarch64-pc-windows-msvc
             suffix: arm64
-            toolchain: beta
           - target: arm64ec-pc-windows-msvc
             suffix: arm64ec
-            toolchain: beta
 
     steps:
       - uses: actions/checkout@v7
@@ -141,7 +131,7 @@ jobs:
       - name: Install rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.toolchain }}
+          toolchain: stable
           target: ${{ matrix.target }}
 
       - uses: Swatinem/rust-cache@v2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2538f9..eb38b31 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- The arm64, arm64ec and arm64x CI targets build on `stable` instead of
+  `beta`, now that the arm64ec TLS-destructors→FLS fix
+  (rust-lang/rust#148799) has reached stable in Rust 1.98.0. Every CI
+  target is on the same toolchain again, so the per-target `toolchain`
+  matrix key is gone.
+- Declared a minimum supported Rust version of `1.98` for the whole
+  crate. The requirement originates with arm64ec — an ARM64X image built
+  without rust-lang/rust#148799 aborts at `0xc0000096` when its EC view
+  is loaded — but is enforced for every target so the failure is a clear
+  `requires rustc 1.98` message instead of a crash at DLL load.
+
 ## [0.9.0] - 2026-07-24
 
 ### Changed
diff --git a/CLAUDE.md b/CLAUDE.md
index 6a16d37..6747885 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -10,7 +10,7 @@ The DLL is loaded into the RDP/Citrix client process and registered as an in-pro
 
 ## Build & Test
 
-Windows + MSVC toolchain required. Cross-platform builds fail (`windows-core` is Windows-only).
+Windows + MSVC toolchain required. Cross-platform builds fail (`windows-core` is Windows-only). MSRV is `1.98` (`rust-version` in `Cargo.toml`), set by the arm64ec requirement below and enforced for every target.
 
 ```
 cargo build                                        # debug
@@ -31,7 +31,7 @@ The `aarch64` + `arm64ec` staticlibs are linked into one ARM64X (hybrid) DLL by
 
 One hard requirement:
 
-- **Toolchain must be at least `beta` (was `nightly`).** `arm64ec` staticlibs built on a toolchain *without* the TLS-destructors→FLS fix (rust-lang/rust#148799) crash at `0xc0000096` when an ARM64X DLL is loaded from an x64 process on ARM64 Windows (rust-lang/rust#145154). The fix first landed in nightly `1.98.0` (2026-06-03) and, as of 2026-07-17, is in `beta` (`1.98.0-beta.4`, verified: beta contains merge `9c963eec`; arm64ec EC-view tests pass 15/15 on a `windows-11-arm` host). CI therefore uses `beta`. Once `1.98.0` reaches stable the arm64 path can move to `stable`. The `Test (arm64x-on-arm64ec)` job is the gate; it only runs on the `windows-11-arm` runner.
+- **Toolchain must be at least `1.98.0` (was `beta`, before that `nightly`).** `arm64ec` staticlibs built on a toolchain *without* the TLS-destructors→FLS fix (rust-lang/rust#148799) crash at `0xc0000096` when an ARM64X DLL is loaded from an x64 process on ARM64 Windows (rust-lang/rust#145154). The fix landed in nightly `1.98.0` (2026-06-03) and rode the train through `beta` (`1.98.0-beta.4`, verified 2026-07-17: beta contains merge `9c963eec`; arm64ec EC-view tests pass 15/15 on a `windows-11-arm` host) into stable `1.98.0`. CI therefore uses `stable` for every target. The `Test (arm64x-on-arm64ec)` job is the gate; it only runs on the `windows-11-arm` runner.
 
 Link recipe (dynamic CRT, MSVC link.exe):
 - Both per-arch staticlibs as explicit inputs (`rd_pipe.lib` arm64 + arm64ec)
@@ -41,7 +41,7 @@ Link recipe (dynamic CRT, MSVC link.exe):
 - `/force:multiple` resolves duplicate `DllMain` (arm64 + arm64ec each define it, plus msvcrt's stub); msvcrt's stub wins but correctly chains through `_pRawDllMain` → user DllMain
 - No SDK version constraint (both 26100 and 28000 work)
 
-The script can be exercised on a Windows ARM64 host: build both staticlibs+DLLs (`cargo +beta build --release --target {aarch64,arm64ec}-pc-windows-msvc`), run the script, then validate the merged DLL with `RD_PIPE_DLL_PATH=<dll> cargo +beta nextest run --target {aarch64,arm64ec}-pc-windows-msvc -E 'binary(dll_smoke) or binary(dvc_emulation)'`.
+The script can be exercised on a Windows ARM64 host: build both staticlibs+DLLs (`cargo build --release --target {aarch64,arm64ec}-pc-windows-msvc`), run the script, then validate the merged DLL with `RD_PIPE_DLL_PATH=<dll> cargo nextest run --target {aarch64,arm64ec}-pc-windows-msvc -E 'binary(dll_smoke) or binary(dvc_emulation)'`.
 
 ## Registration (DllInstall)
 
diff --git a/Cargo.toml b/Cargo.toml
index 7731f61..fc77311 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,6 +23,7 @@ repository = "https://github.com/leonardder/rd_pipe-rs"
 license = "AGPL-3.0-or-later"
 categories = ["network-programming", "os::windows-apis"]
 edition = "2024"
+rust-version = "1.98"
 
 [lib]
 crate-type = ["cdylib", "staticlib"]
diff --git a/readme.md b/readme.md
index ce22402..ddb0cf3 100644
--- a/readme.md
+++ b/readme.md
@@ -26,7 +26,7 @@ The pipe ACL is built from the caller's logon SID, so only the interactive user
 
 ## Building from source
 
-Requires the MSVC Rust toolchain on Windows. Cross-platform builds are not supported.
+Requires the MSVC Rust toolchain on Windows, version 1.98 or newer. Cross-platform builds are not supported.
 
 ```
 cargo build