diff --git a/package-lock.json b/package-lock.json
index 9fca3cf..229f546 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,21 @@
 {
   "name": "formality-wordmap-benchmark",
   "version": "0.1.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 3,
   "requires": true,
-  "dependencies": {
-    "immutable": {
-      "version": "4.0.0-rc.12",
-      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.0.0-rc.12.tgz",
-      "integrity": "sha512-0M2XxkZLx/mi3t8NVwIm1g8nHoEmM9p9UBl/G9k4+hm0kBgOVdMV/B3CY5dQ8qG8qc80NN4gDV4HQv6FTJ5q7A=="
+  "packages": {
+    "": {
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "immutable": "^4.3.8"
+      }
+    },
+    "node_modules/immutable": {
+      "version": "4.3.8",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.8.tgz",
+      "integrity": "sha512-d/Ld9aLbKpNwyl0KiM2CT1WYvkitQ1TSvmRtkcV8FKStiDoA7Slzgjmb/1G2yhKM1p0XeNOieaTbFZmU1d3Xuw==",
+      "license": "MIT"
     }
   }
 }
diff --git a/package.json b/package.json
index 30ef0e4..63ef5c8 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,6 @@
   },
   "homepage": "https://github.com/moonad/formality-wordmap-benchmark#readme",
   "dependencies": {
-    "immutable": "^4.0.0-rc.12"
+    "immutable": "^4.3.8"
   }
 }