diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 58ec3ae..3f5bcd9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, macos-latest, ubuntu-latest]
-        rust_version: [stable, 1.87.0]
+        rust_version: [stable, &msrv 1.87.0]
 
     steps:
       - name: Checkout repository
@@ -147,7 +147,7 @@ jobs:
       fail-fast: false
       matrix:
         target: [aarch64-unknown-linux-gnu]
-        rust_version: [stable, 1.87.0]
+        rust_version: [stable, *msrv]
 
     steps:
       - name: Checkout repository
@@ -160,7 +160,7 @@ jobs:
           targets: ${{ matrix.target }}
 
       - name: Install cross-compilation toolset
-        run: cargo install cross
+        run: cargo install cross --locked
 
       - name: Cache Rust dependencies
         uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
@@ -191,7 +191,7 @@ jobs:
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # master
         with:
-          toolchain: 1.87.0
+          toolchain: *msrv
           targets: aarch64-apple-ios-sim
 
       - name: Install cargo-dinghy