diff --git a/.github/workflows/rust-professionalization-check.yml b/.github/workflows/rust-professionalization-check.yml
index 37ab4d9..2aee4f6 100644
--- a/.github/workflows/rust-professionalization-check.yml
+++ b/.github/workflows/rust-professionalization-check.yml
@@ -5,6 +5,7 @@ on:
     branches:
       - main
     paths:
+      - 'rust-toolchain.toml'
       - 'adk-rust/crates/detmir-core/**'
       - 'adk-rust/crates/detmir-portal/**'
       - 'scripts/check_private_config_guard.sh'
@@ -22,34 +23,35 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install Rust 1.85 with rustfmt and clippy
+      - name: Install pinned Rust toolchain
         run: |
           rustup toolchain install 1.85.0 --profile minimal --component rustfmt --component clippy
-          rustup default 1.85.0
-          cargo --version
-          rustc --version
+          rustup override set 1.85.0
+          rustup show active-toolchain
+          cargo +1.85.0 --version
+          rustc +1.85.0 --version
 
       - name: Cargo fmt check
         working-directory: adk-rust
-        run: cargo fmt --all -- --check
+        run: cargo +1.85.0 fmt --all -- --check
 
       - name: Test detmir-core
         working-directory: adk-rust
-        run: cargo test -p detmir-core
+        run: cargo +1.85.0 test -p detmir-core
 
       - name: Test detmir-portal
         working-directory: adk-rust
-        run: cargo test -p detmir-portal
+        run: cargo +1.85.0 test -p detmir-portal
 
       - name: Clippy detmir-core
         working-directory: adk-rust
-        run: cargo clippy -p detmir-core --all-targets -- -D warnings
+        run: cargo +1.85.0 clippy -p detmir-core --all-targets -- -D warnings
 
       - name: Clippy detmir-portal with captured log
         working-directory: adk-rust
         run: |
           set +e
-          cargo clippy -p detmir-portal --all-targets -- -D warnings > ../detmir-portal-clippy.log 2>&1
+          cargo +1.85.0 clippy -p detmir-portal --all-targets -- -D warnings > ../detmir-portal-clippy.log 2>&1
           status=$?
           echo "clippy_exit_status=${status}" > ../detmir-portal-clippy-status.txt
           tail -n 80 ../detmir-portal-clippy.log