diff --git a/nixos/modules/services/web-apps/nextcloud.nix b/nixos/modules/services/web-apps/nextcloud.nix
index 7e7366480e18..9de2fbc07328 100644
--- a/nixos/modules/services/web-apps/nextcloud.nix
+++ b/nixos/modules/services/web-apps/nextcloud.nix
@@ -30,7 +30,7 @@ let
   phpOptionsStr = toKeyValue phpOptions;
 
   occ = pkgs.writeScriptBin "nextcloud-occ" ''
-    #! ${pkgs.stdenv.shell}
+    #! ${pkgs.runtimeShell}
     cd ${cfg.package}
     sudo=exec
     if [[ "$USER" != nextcloud ]]; then
diff --git a/nixos/tests/dovecot.nix b/nixos/tests/dovecot.nix
index c19850f418bc..bcbe234fd805 100644
--- a/nixos/tests/dovecot.nix
+++ b/nixos/tests/dovecot.nix
@@ -8,7 +8,7 @@ import ./make-test-python.nix {
     services.dovecot2.protocols = [ "imap" "pop3" ];
     environment.systemPackages = let
       sendTestMail = pkgs.writeScriptBin "send-testmail" ''
-        #!${pkgs.stdenv.shell}
+        #!${pkgs.runtimeShell}
         exec sendmail -vt <<MAIL
         From: root@localhost
         To: alice@localhost
@@ -19,7 +19,7 @@ import ./make-test-python.nix {
       '';
 
       sendTestMailViaDeliveryAgent = pkgs.writeScriptBin "send-lda" ''
-        #!${pkgs.stdenv.shell}
+        #!${pkgs.runtimeShell}
 
         exec ${pkgs.dovecot}/libexec/dovecot/deliver -d bob <<MAIL
         From: root@localhost
diff --git a/nixos/tests/nextcloud/basic.nix b/nixos/tests/nextcloud/basic.nix
index 75862feb202d..92ac5c46e8f0 100644
--- a/nixos/tests/nextcloud/basic.nix
+++ b/nixos/tests/nextcloud/basic.nix
@@ -32,7 +32,7 @@ in {
 
   testScript = let
     withRcloneEnv = pkgs.writeScript "with-rclone-env" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       export RCLONE_CONFIG_NEXTCLOUD_TYPE=webdav
       export RCLONE_CONFIG_NEXTCLOUD_URL="http://nextcloud/remote.php/webdav/"
       export RCLONE_CONFIG_NEXTCLOUD_VENDOR="nextcloud"
@@ -41,12 +41,12 @@ in {
       "''${@}"
     '';
     copySharedFile = pkgs.writeScript "copy-shared-file" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       echo 'hi' | ${withRcloneEnv} ${pkgs.rclone}/bin/rclone rcat nextcloud:test-shared-file
     '';
 
     diffSharedFile = pkgs.writeScript "diff-shared-file" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       diff <(echo 'hi') <(${pkgs.rclone}/bin/rclone cat nextcloud:test-shared-file)
     '';
   in ''
diff --git a/nixos/tests/nextcloud/with-mysql-and-memcached.nix b/nixos/tests/nextcloud/with-mysql-and-memcached.nix
index b9ba5888187d..8db630be893a 100644
--- a/nixos/tests/nextcloud/with-mysql-and-memcached.nix
+++ b/nixos/tests/nextcloud/with-mysql-and-memcached.nix
@@ -61,14 +61,14 @@ in {
 
   testScript = let
     configureMemcached = pkgs.writeScript "configure-memcached" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       nextcloud-occ config:system:set memcached_servers 0 0 --value 127.0.0.1 --type string
       nextcloud-occ config:system:set memcached_servers 0 1 --value 11211 --type integer
       nextcloud-occ config:system:set memcache.local --value '\OC\Memcache\APCu' --type string
       nextcloud-occ config:system:set memcache.distributed --value '\OC\Memcache\Memcached' --type string
     '';
     withRcloneEnv = pkgs.writeScript "with-rclone-env" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       export RCLONE_CONFIG_NEXTCLOUD_TYPE=webdav
       export RCLONE_CONFIG_NEXTCLOUD_URL="http://nextcloud/remote.php/webdav/"
       export RCLONE_CONFIG_NEXTCLOUD_VENDOR="nextcloud"
@@ -76,12 +76,12 @@ in {
       export RCLONE_CONFIG_NEXTCLOUD_PASS="$(${pkgs.rclone}/bin/rclone obscure ${adminpass})"
     '';
     copySharedFile = pkgs.writeScript "copy-shared-file" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       echo 'hi' | ${pkgs.rclone}/bin/rclone rcat nextcloud:test-shared-file
     '';
 
     diffSharedFile = pkgs.writeScript "diff-shared-file" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       diff <(echo 'hi') <(${pkgs.rclone}/bin/rclone cat nextcloud:test-shared-file)
     '';
   in ''
diff --git a/nixos/tests/nextcloud/with-postgresql-and-redis.nix b/nixos/tests/nextcloud/with-postgresql-and-redis.nix
index 324853350af6..95219cac9be8 100644
--- a/nixos/tests/nextcloud/with-postgresql-and-redis.nix
+++ b/nixos/tests/nextcloud/with-postgresql-and-redis.nix
@@ -60,14 +60,14 @@ in {
 
   testScript = let
     configureRedis = pkgs.writeScript "configure-redis" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       nextcloud-occ config:system:set redis 'host' --value 'localhost' --type string
       nextcloud-occ config:system:set redis 'port' --value 6379 --type integer
       nextcloud-occ config:system:set memcache.local --value '\OC\Memcache\Redis' --type string
       nextcloud-occ config:system:set memcache.locking --value '\OC\Memcache\Redis' --type string
     '';
     withRcloneEnv = pkgs.writeScript "with-rclone-env" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       export RCLONE_CONFIG_NEXTCLOUD_TYPE=webdav
       export RCLONE_CONFIG_NEXTCLOUD_URL="http://nextcloud/remote.php/webdav/"
       export RCLONE_CONFIG_NEXTCLOUD_VENDOR="nextcloud"
@@ -76,12 +76,12 @@ in {
       "''${@}"
     '';
     copySharedFile = pkgs.writeScript "copy-shared-file" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       echo 'hi' | ${pkgs.rclone}/bin/rclone rcat nextcloud:test-shared-file
     '';
 
     diffSharedFile = pkgs.writeScript "diff-shared-file" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       diff <(echo 'hi') <(${pkgs.rclone}/bin/rclone cat nextcloud:test-shared-file)
     '';
   in ''
diff --git a/nixos/tests/rabbitmq.nix b/nixos/tests/rabbitmq.nix
index 8e7f34d06e32..f403e4ac2edc 100644
--- a/nixos/tests/rabbitmq.nix
+++ b/nixos/tests/rabbitmq.nix
@@ -15,7 +15,7 @@ import ./make-test-python.nix ({ pkgs, ... }: {
 
     machine.wait_for_unit("rabbitmq.service")
     machine.wait_until_succeeds(
-        'su -s ${pkgs.stdenv.shell} rabbitmq -c "rabbitmqctl status"'
+        'su -s ${pkgs.runtimeShell} rabbitmq -c "rabbitmqctl status"'
     )
   '';
 })
diff --git a/nixos/tests/switch-test.nix b/nixos/tests/switch-test.nix
index 7076bd77b770..9ef96cec5ef3 100644
--- a/nixos/tests/switch-test.nix
+++ b/nixos/tests/switch-test.nix
@@ -22,7 +22,7 @@ import ./make-test-python.nix ({ pkgs, ...} : {
     # Ensures failures pass through using pipefail, otherwise failing to
     # switch-to-configuration is hidden by the success of `tee`.
     stderrRunner = pkgs.writeScript "stderr-runner" ''
-      #! ${pkgs.stdenv.shell}
+      #! ${pkgs.runtimeShell}
       set -e
       set -o pipefail
       exec env -i "$@" | tee /dev/stderr
diff --git a/nixos/tests/systemd-confinement.nix b/nixos/tests/systemd-confinement.nix
index b7b10fb36aac..f22836e227b0 100644
--- a/nixos/tests/systemd-confinement.nix
+++ b/nixos/tests/systemd-confinement.nix
@@ -3,14 +3,14 @@ import ./make-test.nix {
 
   machine = { pkgs, lib, ... }: let
     testServer = pkgs.writeScript "testserver.sh" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       export PATH=${lib.escapeShellArg "${pkgs.coreutils}/bin"}
-      ${lib.escapeShellArg pkgs.stdenv.shell} 2>&1
+      ${lib.escapeShellArg pkgs.runtimeShell} 2>&1
       echo "exit-status:$?"
     '';
 
     testClient = pkgs.writeScriptBin "chroot-exec" ''
-      #!${pkgs.stdenv.shell} -e
+      #!${pkgs.runtimeShell} -e
       output="$(echo "$@" | nc -NU "/run/test$(< /teststep).sock")"
       ret="$(echo "$output" | sed -nre '$s/^exit-status:([0-9]+)$/\1/p')"
       echo "$output" | head -n -1
diff --git a/nixos/tests/systemd.nix b/nixos/tests/systemd.nix
index 8028145939bb..ca2e36a443e9 100644
--- a/nixos/tests/systemd.nix
+++ b/nixos/tests/systemd.nix
@@ -22,7 +22,7 @@ import ./make-test-python.nix ({ pkgs, ... }: {
     test-support.displayManager.auto.user = "alice";
 
     systemd.shutdown.test = pkgs.writeScript "test.shutdown" ''
-      #!${pkgs.stdenv.shell}
+      #!${pkgs.runtimeShell}
       PATH=${lib.makeBinPath (with pkgs; [ utillinux coreutils ])}
       mount -t 9p shared -o trans=virtio,version=9p2000.L /tmp/shared
       touch /tmp/shared/shutdown-test
diff --git a/nixos/tests/virtualbox.nix b/nixos/tests/virtualbox.nix
index f03dc1cc4138..aec8da6a2af3 100644
--- a/nixos/tests/virtualbox.nix
+++ b/nixos/tests/virtualbox.nix
@@ -23,7 +23,7 @@ let
     guestAdditions = pkgs.linuxPackages.virtualboxGuestAdditions;
 
     miniInit = ''
-      #!${pkgs.stdenv.shell} -xe
+      #!${pkgs.runtimeShell} -xe
       export PATH="${lib.makeBinPath [ pkgs.coreutils pkgs.utillinux ]}"
 
       mkdir -p /run/dbus
@@ -80,7 +80,7 @@ let
       touch /mnt-root/boot-done
       hostname "${vmName}"
       mkdir -p /nix/store
-      unshare -m ${escapeShellArg pkgs.stdenv.shell} -c '
+      unshare -m ${escapeShellArg pkgs.runtimeShell} -c '
         mount -t vboxsf nixstore /nix/store
         exec "$stage2Init"
       '