diff --git a/packages/core/package.json b/packages/core/package.json
index b66c5bae..e84993c6 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -10,6 +10,7 @@
   "homepage": "https://github.com/actions/toolkit/tree/master/packages/core",
   "license": "MIT",
   "main": "lib/core.js",
+  "types": "lib/core.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"
diff --git a/packages/exec/package.json b/packages/exec/package.json
index f283e8ee..42d9148b 100644
--- a/packages/exec/package.json
+++ b/packages/exec/package.json
@@ -10,6 +10,7 @@
   "homepage": "https://github.com/actions/toolkit/tree/master/packages/exec",
   "license": "MIT",
   "main": "lib/exec.js",
+  "types": "lib/exec.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"
diff --git a/packages/github/package.json b/packages/github/package.json
index 36aeea4a..e49db4a4 100644
--- a/packages/github/package.json
+++ b/packages/github/package.json
@@ -9,6 +9,7 @@
   "homepage": "https://github.com/actions/toolkit/tree/master/packages/github",
   "license": "MIT",
   "main": "lib/github.js",
+  "types": "lib/github.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"
diff --git a/packages/io/package.json b/packages/io/package.json
index 3214676c..9530062b 100644
--- a/packages/io/package.json
+++ b/packages/io/package.json
@@ -10,6 +10,7 @@
   "homepage": "https://github.com/actions/toolkit/tree/master/packages/io",
   "license": "MIT",
   "main": "lib/io.js",
+  "types": "lib/io.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"
diff --git a/packages/tool-cache/package.json b/packages/tool-cache/package.json
index a9816ae0..84055222 100644
--- a/packages/tool-cache/package.json
+++ b/packages/tool-cache/package.json
@@ -10,6 +10,7 @@
   "homepage": "https://github.com/actions/toolkit/tree/master/packages/exec",
   "license": "MIT",
   "main": "lib/tool-cache.js",
+  "types": "lib/tool-cache.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"