diff --git a/.github/workflows/ci-backwards-compatibility.yml b/.github/workflows/ci-backwards-compatibility.yml
index 919fb4009da..5c23a64b9a8 100644
--- a/.github/workflows/ci-backwards-compatibility.yml
+++ b/.github/workflows/ci-backwards-compatibility.yml
@@ -60,7 +60,7 @@ jobs:
             CARGO_PROFILE=ci \
             PERFIT_ACCESS_TOKEN="${{ secrets.PERFIT_ACCESS_TOKEN }}" \
             nix develop -c \
-            nix shell github:rustshop/fs-dir-cache -c \
+            nix shell 'github:rustshop/fs-dir-cache?rev=e9752d00ee16778c9d3d0b93a09c49c44013ac17' -c \
             nix run 'github:rustshop/perfit?rev=a2ea3bae86b0e70d2ebdbca1fd16a843b7f0a3bd#perfit' -- \
               run \
                 --metric aPuCAjrFT7uE5Oax_T4sMw \
diff --git a/.github/workflows/ci-fuzz.yml b/.github/workflows/ci-fuzz.yml
index bd34462982f..b6828fd6d0e 100644
--- a/.github/workflows/ci-fuzz.yml
+++ b/.github/workflows/ci-fuzz.yml
@@ -58,7 +58,7 @@ jobs:
             CARGO_PROFILE=ci \
             PERFIT_ACCESS_TOKEN="${{ secrets.PERFIT_ACCESS_TOKEN }}" \
             nix develop .#fuzz -c \
-            nix shell github:rustshop/fs-dir-cache -c \
+            nix shell 'github:rustshop/fs-dir-cache?rev=e9752d00ee16778c9d3d0b93a09c49c44013ac17' -c \
             nix run 'github:rustshop/perfit?rev=a2ea3bae86b0e70d2ebdbca1fd16a843b7f0a3bd#perfit' -- \
               run \
                 --metric EOKLCdk0SRWnjmA0sLRFKQ \
diff --git a/.github/workflows/upgrade-tests.yml b/.github/workflows/upgrade-tests.yml
index 75e4a5e026e..6ae13f7b0f2 100644
--- a/.github/workflows/upgrade-tests.yml
+++ b/.github/workflows/upgrade-tests.yml
@@ -67,7 +67,7 @@ jobs:
             CARGO_PROFILE=ci \
             PERFIT_ACCESS_TOKEN="${{ secrets.PERFIT_ACCESS_TOKEN }}" \
             nix develop -c \
-            nix shell github:rustshop/fs-dir-cache -c \
+            nix shell 'github:rustshop/fs-dir-cache?rev=e9752d00ee16778c9d3d0b93a09c49c44013ac17' -c \
             nix run 'github:rustshop/perfit?rev=a2ea3bae86b0e70d2ebdbca1fd16a843b7f0a3bd#perfit' -- \
               run \
                 --metric 5pReH96mSsqIeh513jJQGg \
diff --git a/scripts/ci/run-in-fs-dir-cache.sh b/scripts/ci/run-in-fs-dir-cache.sh
index de6e7f05ba6..3f3471f1f41 100755
--- a/scripts/ci/run-in-fs-dir-cache.sh
+++ b/scripts/ci/run-in-fs-dir-cache.sh
@@ -32,25 +32,34 @@ log_file="$FS_DIR_CACHE_ROOT/log"
 
 fs-dir-cache gc unused --seconds "$((5 * 24 * 60 * 60))" # delete caches not used in more than a 5 days
 
-# create/reuse cache (sub-directory) and lock it (wait if already locked)
-cache_dir=$(fs-dir-cache lock --key-file Cargo.lock --key-str "${CARGO_PROFILE-:dev}" --key-file flake.lock)
+export log_file
+export job_name
+src_dir=$(pwd)
+export src_dir
 
-export TARGET_DIR="$cache_dir/target"
-export CARGO_BUILD_TARGET_DIR="$TARGET_DIR"
+function run_in_cache() {
+    echo "$(date --rfc-3339=seconds) RUN job=$job_name dir=$(pwd)" >> "$log_file"
+    >&2 echo "$(date --rfc-3339=seconds) RUN job=$job_name dir=$(pwd)"
+    CARGO_BUILD_TARGET_DIR="$(pwd)"
+    export CARGO_BUILD_TARGET_DIR
+    cd "$src_dir"
 
->&2 echo "Starting a job=$job_name in cache_dir=$cache_dir"
+    function on_exit() {
+        local exit_code=$?
 
-echo "$(date --rfc-3339=seconds) RUN $cache_dir job=$job_name" >> "$log_file"
+        echo "$(date --rfc-3339=seconds) END job=$job_name code=$exit_code" >> "$log_file"
+        >&2 echo "$(date --rfc-3339=seconds) END job=$job_name code=$exit_code"
 
-on_exit() {
-    local exit_code=$?
+        exit $exit_code
+    }
+    trap on_exit EXIT
 
-    fs-dir-cache unlock --dir "${cache_dir}"
-    echo "$(date --rfc-3339=seconds) END $cache_dir job=$job_name code=$exit_code" >> "$log_file"
-
-    exit $exit_code
+    "$@"
 }
-trap on_exit EXIT
+export -f run_in_cache
 
 
-"$@"
+fs-dir-cache exec \
+    --key-file Cargo.lock --key-str "${CARGO_PROFILE-:dev}" --key-file flake.lock \
+    -- \
+    bash -c 'run_in_cache "$@"' _ "$@"