diff --git a/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package-lock.json b/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package-lock.json
index f45484ffb..172a80888 100644
--- a/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package-lock.json
+++ b/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package-lock.json
@@ -12,6 +12,7 @@
         "buffer": "6.0.3"
       },
       "devDependencies": {
+        "@types/node": "^22.7.4",
         "typescript": "5.3.3"
       }
     },
@@ -47,6 +48,16 @@
         "urijs": "^1.19.1"
       }
     },
+    "node_modules/@types/node": {
+      "version": "22.7.4",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.7.4.tgz",
+      "integrity": "sha512-y+NPi1rFzDs1NdQHHToqeiX2TIS79SWEAw9GYhkkx8bD0ChpfqC+n2j5OXOCpzfojBEBt6DnEnnG9MY0zk1XLg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.19.2"
+      }
+    },
     "node_modules/asynckit": {
       "version": "0.4.0",
       "license": "MIT"
@@ -288,6 +299,13 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici-types": {
+      "version": "6.19.8",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
+      "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/urijs": {
       "version": "1.19.11",
       "license": "MIT"
diff --git a/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package.json b/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package.json
index 5cc5e337f..35504c2c5 100644
--- a/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package.json
+++ b/cmd/crates/soroban-spec-typescript/fixtures/test_custom_types/package.json
@@ -8,10 +8,11 @@
     "build": "tsc"
   },
   "dependencies": {
-    "buffer": "6.0.3",
-    "@stellar/stellar-sdk": "12.1.0"
+    "@stellar/stellar-sdk": "12.1.0",
+    "buffer": "6.0.3"
   },
   "devDependencies": {
+    "@types/node": "^22.7.4",
     "typescript": "5.3.3"
   }
 }