diff --git a/packages/hijri/package.json b/packages/hijri/package.json
index 17d77f8..17684cb 100644
--- a/packages/hijri/package.json
+++ b/packages/hijri/package.json
@@ -6,7 +6,8 @@
   "module": "build/index.esm.js",
   "typings": "build/index.d.ts",
   "peerDependencies": {
-    "moment-hijri": "^2.1.2"
+    "moment-hijri": "^2.1.2",
+    "tslib": "^2.5.0"
   },
   "peerDependenciesMeta": {
     "moment-hijri": {
diff --git a/packages/jalaali/package.json b/packages/jalaali/package.json
index f382938..1582e22 100644
--- a/packages/jalaali/package.json
+++ b/packages/jalaali/package.json
@@ -6,7 +6,8 @@
   "module": "build/index.esm.js",
   "typings": "build/index.d.ts",
   "peerDependencies": {
-    "moment-jalaali": "^0.7.4 || ^0.8.0 || ^0.9.0"
+    "moment-jalaali": "^0.7.4 || ^0.8.0 || ^0.9.0",
+    "tslib": "^2.5.0"
   },
   "peerDependenciesMeta": {
     "moment-jalaali": {