diff --git a/package.json b/package.json
index 84974e5..df1c15c 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@types/cross-spawn": "6.0.2",
     "@types/jasmine": "3.6.2",
-    "@types/pngjs": "^3.4.2",
+    "@types/pngjs": "3.4.2",
     "@types/uuid": "8.3.0",
     "@typescript-eslint/eslint-plugin": "4.10.0",
     "@typescript-eslint/parser": "4.10.0",