diff --git a/craft_parts/executor/step_handler.py b/craft_parts/executor/step_handler.py
index 404df69..f90e2ac 100644
--- a/craft_parts/executor/step_handler.py
+++ b/craft_parts/executor/step_handler.py
@@ -243,8 +243,9 @@ class StepHandler:
                 print(script, file=script_file)
                 script_file.flush()
                 script_file.seek(0)
+                import shutil
                 process = subprocess.Popen(  # pylint: disable=consider-using-with
-                    ["/bin/bash"],
+                    [shutil.which("bash")],
                     stdin=script_file,
                     cwd=work_dir,
                     stdout=self._stdout,
@@ -394,7 +395,8 @@ def _create_and_run_script(
 ) -> None:
     """Create a script with step-specific commands and execute it."""
     with script_path.open("w") as run_file:
-        print("#!/bin/bash", file=run_file)
+        import shutil
+        print(f"#!{shutil.which('bash')}", file=run_file)
         print("set -euo pipefail", file=run_file)
 
         if build_environment_script_path:
diff --git a/craft_parts/plugins/validator.py b/craft_parts/plugins/validator.py
index b8d8f11..fce0e72 100644
--- a/craft_parts/plugins/validator.py
+++ b/craft_parts/plugins/validator.py
@@ -142,9 +142,9 @@ class PluginEnvironmentValidator:
             print(self._env, file=env_file)
             print(cmd, file=env_file)
             env_file.flush()
-
+            import shutil
             proc = subprocess.run(
-                ["/bin/bash", env_file.name],
+                [shutil.which("bash"), env_file.name],
                 check=True,
                 capture_output=True,
                 text=True,