diff --git a/Makefile b/Makefile
index 0c00b79..ba906ec 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SHELL := /bin/bash
+SHELL := $(shell echo $$SHELL)
 .PHONY: $(shell sed -n -e '/^$$/ { n ; /^[^ .\#][^ ]*:/ { s/:.*$$// ; p ; } ; }' $(MAKEFILE_LIST))
 VERSION := $$(grep '^version' pyproject.toml | sed 's%version = "\(.*\)"%\1%')
 APP_NAME := $$(grep '^name' pyproject.toml | head -1 | sed 's%name = "\(.*\)"%\1%')
@@ -9,7 +9,7 @@ version: ## display version and exit
 	@echo $(VERSION)
 
 dev: ## setup development environment
-	./setup.sh
+	$(SHELL) ./setup.sh
 
 test: ## run unit tests
 	@echo "Running tests..."
diff --git a/setup.sh b/setup.sh
index c02e690..5b4309f 100755
--- a/setup.sh
+++ b/setup.sh
@@ -1,5 +1,3 @@
-#!/usr/bin/env bash
-
 # This script installs Rye and updates the shell configuration file.
 # It also initializes current project and syncs the dependencies.
 # It is intended to be run on a new system to quickly set up Rye.