diff --git a/bootstrap.sh b/bootstrap.sh
index d54779d..5eaf442 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -8,8 +8,8 @@ readonly SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 # Nix Installer Configuration
 # =============================================================================
 # renovate: datasource=github-releases depName=DeterminateSystems/nix-installer
-readonly NIX_INSTALLER_VERSION="v3.15.1"
-readonly NIX_INSTALLER_SHA256="e19eac62d6a7fb7c1ae595b36261ffd9ae6bee4583690baa391dc795b3096d5e"
+readonly NIX_INSTALLER_VERSION="v3.21.5"
+readonly NIX_INSTALLER_SHA256="c9368f4bbfbc78ace32bf018cb15534344b33c0161468deddbfcc8a04f7c9a01"
 readonly NIX_INSTALLER_URL="https://install.determinate.systems/nix/tag/${NIX_INSTALLER_VERSION}"
 
 # =============================================================================