diff --git a/package-lock.json b/package-lock.json
index d51c73f..fb2d4b7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,6 +7,7 @@
         "": {
             "name": "health-cards-dev-tools",
             "version": "1.3.0-2",
+            "hasInstallScript": true,
             "license": "MIT",
             "dependencies": {
                 "@fidm/x509": "^1.2.1",
@@ -4463,13 +4464,10 @@
             "dev": true
         },
         "node_modules/json5": {
-            "version": "2.2.0",
-            "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
-            "integrity": "sha512-f+8cldu7X/y7RAJurMEJmdoKXGB/X550w2Nr3tTbezL6RwEE/iMcm+tZnXeoZtKuOq6ft8+CqzEkrIgx1fPoQA==",
+            "version": "2.2.3",
+            "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
+            "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
             "dev": true,
-            "dependencies": {
-                "minimist": "^1.2.5"
-            },
             "bin": {
                 "json5": "lib/cli.js"
             },
@@ -9975,13 +9973,10 @@
             "dev": true
         },
         "json5": {
-            "version": "2.2.0",
-            "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
-            "integrity": "sha512-f+8cldu7X/y7RAJurMEJmdoKXGB/X550w2Nr3tTbezL6RwEE/iMcm+tZnXeoZtKuOq6ft8+CqzEkrIgx1fPoQA==",
-            "dev": true,
-            "requires": {
-                "minimist": "^1.2.5"
-            }
+            "version": "2.2.3",
+            "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
+            "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
+            "dev": true
         },
         "jsqr": {
             "version": "1.4.0",
diff --git a/package.json b/package.json
index 861252b..9637d7e 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,8 @@
         "update-validator": "git pull && npm install && npm run build",
         "lint": "eslint --config .eslintrc.json --ext .ts ./src ./tests",
         "prune-fhir-schema": "ts-node --files src/prune-fhir-schema.ts",
-        "shl-server": "cd ./shl-server && node ./src/server.js"
+        "shl-server": "cd ./shl-server && node ./src/server.js",
+        "postinstall": "cd ./shl-server && npm install && tsc"
     },
     "bin": {
         "shc-validator": "js/src/shc-validator.js"
diff --git a/shl-server/tsconfig.json b/shl-server/tsconfig.json
index c4c8450..473e0fe 100644
--- a/shl-server/tsconfig.json
+++ b/shl-server/tsconfig.json
@@ -25,7 +25,7 @@
     // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
 
     /* Modules */
-    "module": "Node16",                                  /* Specify what module code is generated. */
+    "module": "CommonJS",                                  /* Specify what module code is generated. */
     // "rootDir": "./",                                  /* Specify the root folder within your source files. */
     // "moduleResolution": "node",                       /* Specify how TypeScript looks up a file from a given module specifier. */
     // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */