diff --git a/.github/workflows/bench-primitives.yml b/.github/workflows/bench-primitives.yml
index c2a6234..b0edaf1 100644
--- a/.github/workflows/bench-primitives.yml
+++ b/.github/workflows/bench-primitives.yml
@@ -67,7 +67,7 @@ jobs:
 
       - name: 🏃🏻‍♀️ Benchmarks (using Nix as shell)
         working-directory: ciphers
-        run: nix develop ".#devShells.${{ matrix.system }}.benchmark" --command cargo bench -F bench --bench primitives --verbose $RUST_TARGET_FLAG -- --output-format bencher | tee ../bench-primitives.txt
+        run: nix develop --command cargo bench -F bench --bench primitives --verbose $RUST_TARGET_FLAG -- --output-format bencher | tee ../bench-primitives.txt
 
       - name: Extract benchmarks
         uses: cryspen/benchmark-data-extract-transform@v2
diff --git a/.github/workflows/bench-protocol.yml b/.github/workflows/bench-protocol.yml
index 881d12d..6a66f74 100644
--- a/.github/workflows/bench-protocol.yml
+++ b/.github/workflows/bench-protocol.yml
@@ -66,7 +66,7 @@ jobs:
       # Benchmarks ...
 
       - name: 🏃🏻‍♀️ Benchmarks
-        run: nix develop ".#devShells.${{ matrix.system }}.benchmark" --command cargo bench -p rosenpass --bench trace_handshake -F trace_bench --verbose $RUST_TARGET_FLAG >bench-protocol.json
+        run: nix develop --command cargo bench -p rosenpass --bench trace_handshake -F trace_bench --verbose $RUST_TARGET_FLAG >bench-protocol.json
 
       - name: Upload benchmarks
         uses: cryspen/benchmark-upload-and-plot-action@v3
diff --git a/flake.nix b/flake.nix
index 4b3413f..8ae3fad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -173,15 +173,6 @@
                 inherit (pkgs.cargo-llvm-cov) LLVM_COV LLVM_PROFDATA;
               };
             };
-            devShells.benchmark = pkgs.mkShell {
-              inputsFrom = [ pkgs.rosenpass ];
-              nativeBuildInputs = let
-                      rustToolchain = (inputs.fenix.packages.${system}.toolchainOf {
-                          channel = "1.77.0";
-                          sha256 = "sha256-+syqAd2kX8KVa8/U2gz3blIQTTsYYt3U63xBWaGOSc8=";
-                      });
-                  in [ rustToolchain.toolchain ];
-            };
 
             checks =
               {