diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c93a6f3..ba66d76 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -124,6 +124,7 @@ jobs:
         uses: dtolnay/rust-toolchain@nightly
         with:
           components: rust-src
+          toolchain: nightly-2025-09-24
           targets: wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2
       - name: Install dependencies
diff --git a/.github/workflows/nightly-release.yml b/.github/workflows/nightly-release.yml
index 0fe9590..cbab208 100644
--- a/.github/workflows/nightly-release.yml
+++ b/.github/workflows/nightly-release.yml
@@ -108,6 +108,7 @@ jobs:
         uses: dtolnay/rust-toolchain@nightly
         with:
           components: rust-src
+          toolchain: nightly-2025-09-24
           targets: wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2
       - name: Install dependencies
@@ -116,7 +117,7 @@ jobs:
         run: |
           if [[ ${{ matrix.feature }} == *parallel* ]]; then
             env RUSTFLAGS="-C target-feature=+atomics,+bulk-memory,+mutable-globals" \
-            rustup run nightly wasm-pack build --release --target web --scope waku \
+            rustup run nightly-2025-09-24 wasm-pack build --release --target web --scope waku \
             --features ${{ matrix.feature }} -Z build-std=panic_abort,std
           else
             wasm-pack build --release --target web --scope waku
diff --git a/rln-wasm/Makefile.toml b/rln-wasm/Makefile.toml
index 6f9765c..738e4f1 100644
--- a/rln-wasm/Makefile.toml
+++ b/rln-wasm/Makefile.toml
@@ -16,7 +16,7 @@ args = [
     "RUSTFLAGS=-C target-feature=+atomics,+bulk-memory,+mutable-globals",
     "rustup",
     "run",
-    "nightly",
+    "nightly-2025-09-24",
     "wasm-pack",
     "build",
     "--release",
@@ -78,7 +78,7 @@ args = [
     "RUSTFLAGS=-C target-feature=+atomics,+bulk-memory,+mutable-globals",
     "rustup",
     "run",
-    "nightly",
+    "nightly-2025-09-24",
     "wasm-pack",
     "test",
     "--release",
diff --git a/rln-wasm/README.md b/rln-wasm/README.md
index 85a20ca..7a1fb29 100644
--- a/rln-wasm/README.md
+++ b/rln-wasm/README.md
@@ -98,7 +98,7 @@ enabling multi-threaded execution in the browser.
 #### Install `nightly` Rust
 
 ```bash
-rustup install nightly
+rustup install nightly-2025-09-24
 ```
 
 ### Build Commands