diff --git a/.envrc b/.envrc
index f5141c2..a6b1f81 100644
--- a/.envrc
+++ b/.envrc
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 if ! has nix_direnv_version || ! nix_direnv_version 3.0.0; then
     source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.0/direnvrc" "sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg="
 fi
diff --git a/templates/c++-cmake/.envrc b/templates/c++-cmake/.envrc
old mode 100644
new mode 100755
index de77fcb..390d06d
--- a/templates/c++-cmake/.envrc
+++ b/templates/c++-cmake/.envrc
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 if ! has nix_direnv_version || ! nix_direnv_version 3.0.0; then
     source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.0/direnvrc" "sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg="
 fi
diff --git a/templates/c++-meson/.envrc b/templates/c++-meson/.envrc
index de77fcb..390d06d 100644
--- a/templates/c++-meson/.envrc
+++ b/templates/c++-meson/.envrc
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 if ! has nix_direnv_version || ! nix_direnv_version 3.0.0; then
     source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.0/direnvrc" "sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg="
 fi
diff --git a/templates/rust-cargo/.envrc b/templates/rust-cargo/.envrc
index de77fcb..390d06d 100644
--- a/templates/rust-cargo/.envrc
+++ b/templates/rust-cargo/.envrc
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 if ! has nix_direnv_version || ! nix_direnv_version 3.0.0; then
     source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.0/direnvrc" "sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg="
 fi