diff --git a/action.yml b/action.yml
index 75f39ac..0306268 100644
--- a/action.yml
+++ b/action.yml
@@ -129,7 +129,7 @@ inputs:
   nix-installer-url:
     description: (deprecated) A URL pointing to a `nix-installer.sh` script
     required: false
-  ci-mode:
+  _internal-strict-mode:
     description: Whether to fail when any errors are thrown. Used only to test the Action; do not set this in your own workflows.
     default: false
 
diff --git a/dist/index.js b/dist/index.js
index 3c10119..7f48b04 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -96694,7 +96694,7 @@ const external_node_child_process_namespaceObject = __WEBPACK_EXTERNAL_createReq
 const external_node_stream_promises_namespaceObject = __WEBPACK_EXTERNAL_createRequire(import.meta.url)("node:stream/promises");
 ;// CONCATENATED MODULE: external "node:zlib"
 const external_node_zlib_namespaceObject = __WEBPACK_EXTERNAL_createRequire(import.meta.url)("node:zlib");
-;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@180884918b85ef67dad81f70b4130eca5268242e_o7ea7dhs7wrsl7wvvt2otnlz3q/node_modules/detsys-ts/dist/index.js
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@ed02129aed8e4d6402d920152652877189bece70_3whmnlhrx56zhgtsjnkrhnutfu/node_modules/detsys-ts/dist/index.js
 var __defProp = Object.defineProperty;
 var __export = (target, all) => {
   for (var name in all)
@@ -97184,7 +97184,7 @@ var DetSysAction = class {
     this.actionOptions = makeOptionsConfident(actionOptions);
     this.exceptionAttachments = /* @__PURE__ */ new Map();
     this.nixStoreTrust = "unknown";
-    this.strictMode = getBool("ci-mode");
+    this.strictMode = getBool("_internal-strict-mode");
     this.events = [];
     this.client = got_dist_source.extend({
       retry: {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index aaf3c16..5779c5a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -16,7 +16,7 @@ dependencies:
     version: 5.1.1
   detsys-ts:
     specifier: github:DeterminateSystems/detsys-ts
-    version: github.com/DeterminateSystems/detsys-ts/180884918b85ef67dad81f70b4130eca5268242e
+    version: github.com/DeterminateSystems/detsys-ts/ed02129aed8e4d6402d920152652877189bece70
   string-argv:
     specifier: ^0.3.2
     version: 0.3.2
@@ -5429,10 +5429,10 @@ packages:
     engines: { node: ">=10" }
     dev: true
 
-  github.com/DeterminateSystems/detsys-ts/180884918b85ef67dad81f70b4130eca5268242e:
+  github.com/DeterminateSystems/detsys-ts/ed02129aed8e4d6402d920152652877189bece70:
     resolution:
       {
-        tarball: https://codeload.github.com/DeterminateSystems/detsys-ts/tar.gz/180884918b85ef67dad81f70b4130eca5268242e,
+        tarball: https://codeload.github.com/DeterminateSystems/detsys-ts/tar.gz/ed02129aed8e4d6402d920152652877189bece70,
       }
     name: detsys-ts
     version: 1.0.0
diff --git a/src/index.ts b/src/index.ts
index 90a32f4..2405a4a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -51,7 +51,7 @@ class NixInstallerAction extends DetSysAction {
   kvm: boolean;
   githubServerUrl: string | null;
   githubToken: string | null;
-  forceDockerShim: boolean | null;
+  forceDockerShim: boolean;
   init: string | null;
   localRoot: string | null;
   logDirectives: string | null;
@@ -71,7 +71,7 @@ class NixInstallerAction extends DetSysAction {
   planner: string | null;
   reinstall: boolean;
   startDaemon: boolean;
-  trustRunnerUser: boolean | null;
+  trustRunnerUser: boolean;
   runnerOs: string | undefined;
 
   constructor() {