diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index d6ba854a..857578fd 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -23,7 +23,7 @@ jobs:
         # Fixed Nigthly version is used to prevent
         # CI failures which are not relevant to PR changes
         # on introduction of new Clippy lints.
-        toolchain: nightly-2025-06-01
+        toolchain: nightly-2025-09-15
         components: clippy,rust-src
     - name: std feature
       run: cargo clippy --features std
diff --git a/src/backends/windows.rs b/src/backends/windows.rs
index b5cd504f..b1e10e7f 100644
--- a/src/backends/windows.rs
+++ b/src/backends/windows.rs
@@ -44,7 +44,7 @@ pub use crate::util::{inner_u32, inner_u64};
 extern "system" {
     fn ProcessPrng(pbdata: *mut u8, cbdata: usize) -> BOOL;
 }
-#[allow(clippy::upper_case_acronyms)]
+#[allow(clippy::upper_case_acronyms, clippy::incompatible_msrv)]
 type BOOL = core::ffi::c_int; // MSRV 1.64, similarly OK for this backend.
 const TRUE: BOOL = 1;