diff --git a/package.json b/package.json
index 07c9c74..98e34d9 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
     "@types/node": "^13.13.5"
   },
   "devDependencies": {
+    "typescript": "^3.8.3",
     "@zeit/ncc": "^0.22.1"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e2824a0..117a766 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -6,6 +6,7 @@ dependencies:
   download: 8.0.0
 devDependencies:
   '@zeit/ncc': 0.22.1
+  typescript: 3.8.3
 lockfileVersion: 5.1
 packages:
   /@actions/core/1.2.4:
@@ -992,6 +993,13 @@ packages:
       node: '>=0.6.11 <=0.7.0 || >=0.7.3'
     resolution:
       integrity: sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg==
+  /typescript/3.8.3:
+    dev: true
+    engines:
+      node: '>=4.2.0'
+    hasBin: true
+    resolution:
+      integrity: sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==
   /unbzip2-stream/1.3.0:
     dependencies:
       buffer: 3.6.2
@@ -1068,3 +1076,4 @@ specifiers:
   '@types/node': ^13.13.5
   '@zeit/ncc': ^0.22.1
   download: ^8.0.0
+  typescript: ^3.8.3