diff --git a/app/gateway-api/src/adminRouter.ts b/app/gateway-api/src/adminRouter.ts
index 8f5b98b..2e80deb 100644
--- a/app/gateway-api/src/adminRouter.ts
+++ b/app/gateway-api/src/adminRouter.ts
@@ -768,9 +768,9 @@ export const adminRouter = router({
                     }
                 }
 
-                let resolvedCommitSha: string | null = null;
                 const gitRef = input.install.gitRef?.trim();
                 if (gitRef) {
+                    let resolvedCommitSha: string;
                     try {
                         resolvedCommitSha = await resolveGitCommitSha(gitRef);
                     } catch (error) {
diff --git a/app/gateway-api/src/router.ts b/app/gateway-api/src/router.ts
index 29e9fce..a6fa92d 100644
--- a/app/gateway-api/src/router.ts
+++ b/app/gateway-api/src/router.ts
@@ -284,7 +284,7 @@ export const appRouter = router({
                     accessTokenValidUntil: oauthSession.accessTokenValidUntil,
                     refreshTokenValidUntil: oauthSession.refreshTokenValidUntil,
                 };
-                let created = null;
+                let created: Awaited<ReturnType<typeof ctx.users.createUser>>;
                 try {
                     created = await ctx.users.createUser({
                         username: input.username,
diff --git a/packages/tools-scripts/package.json b/packages/tools-scripts/package.json
index dd4167a..9ffb2eb 100644
--- a/packages/tools-scripts/package.json
+++ b/packages/tools-scripts/package.json
@@ -13,6 +13,7 @@
         "zod": "^4.3.5"
     },
     "devDependencies": {
+        "@types/node": "^26.1.1",
         "tsx": "^4.21.0",
         "typescript": "6.0.2"
     }
diff --git a/packages/tools-scripts/tsconfig.json b/packages/tools-scripts/tsconfig.json
index 9b42f91..059c2c7 100644
--- a/packages/tools-scripts/tsconfig.json
+++ b/packages/tools-scripts/tsconfig.json
@@ -5,6 +5,7 @@
         "moduleResolution": "NodeNext",
         "target": "ES2023",
         "lib": ["ES2024"],
+        "types": ["node"],
         "verbatimModuleSyntax": true,
         "noUncheckedIndexedAccess": true,
         "exactOptionalPropertyTypes": true,
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d42bc46..5159ef9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -431,6 +431,9 @@ importers:
         specifier: ^4.3.5
         version: 4.3.5
     devDependencies:
+      '@types/node':
+        specifier: ^26.1.1
+        version: 26.1.1
       tsx:
         specifier: ^4.21.0
         version: 4.21.0