diff --git a/animetosho2mks.py b/animetosho2mks.py
index 7e33d04..f4aa51e 100755
--- a/animetosho2mks.py
+++ b/animetosho2mks.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.tqdm ])" mkvtoolnix-cli
 from subprocess import run
 from tqdm import tqdm
diff --git a/ass2mks.py b/ass2mks.py
index cfc3c2a..165ecd4 100755
--- a/ass2mks.py
+++ b/ass2mks.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p python3 ffmpeg-full
 from subprocess import run
 import mimetypes
diff --git a/cbz2ebook.sh b/cbz2ebook.sh
index 7f70a42..e36f398 100755
--- a/cbz2ebook.sh
+++ b/cbz2ebook.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i zsh -p imagemagick unzip zip zsh
 set -e
 
diff --git a/chiptune-mix.sh b/chiptune-mix.sh
index 20466db..02b3b40 100755
--- a/chiptune-mix.sh
+++ b/chiptune-mix.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i bash -p sidplayfp ffmpeg-full
 # Creates 4-channel flac file to be played with mpv profile “musicvideo-c64”
 # Set HVSC_BASE to point to your HVSC directory, otherwise the output
diff --git a/encoder-parameters.py b/encoder-parameters.py
index 2390ee3..82c3466 100755
--- a/encoder-parameters.py
+++ b/encoder-parameters.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p python3
 import sys
 import subprocess
diff --git a/huion-tablet.py b/huion-tablet.py
index b2eb273..baa90a1 100755
--- a/huion-tablet.py
+++ b/huion-tablet.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.pyyaml ])"
 # Set Huion H430P parameters from saved profiles using swaymsg
 #
diff --git a/odrive-proxy.py b/odrive-proxy.py
index a6e5b78..5bf4156 100755
--- a/odrive-proxy.py
+++ b/odrive-proxy.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p "python3.withPackages(ps: with ps; [ ps.flask ps.requests ])"
 from flask import Flask, redirect
 import requests
diff --git a/quizlet2anki.py b/quizlet2anki.py
index 8e7fc08..9cf4b0f 100755
--- a/quizlet2anki.py
+++ b/quizlet2anki.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p python3
 # I want to use Anki instead of Quizlet. However, Quizlet only provides a very
 # limited “export” functionality, that exports something like csv, but does not
diff --git a/ssim-stats.py b/ssim-stats.py
index df1f698..edc48c4 100755
--- a/ssim-stats.py
+++ b/ssim-stats.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p "python3.withPackages(ps: with ps; [ ps.pandas ps.numpy ps.tabulate ])"
 import pandas as pd
 import numpy as np
diff --git a/wordclock.py b/wordclock.py
index 8784cc0..388e4ad 100755
--- a/wordclock.py
+++ b/wordclock.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env nix-shell
+#!/usr/bin/env cached-nix-shell
 #!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.paho-mqtt ])"
 import sys
 import paho.mqtt.client as mqtt