diff --git a/package.json b/package.json
index d092009..90743c1 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "@aureooms/js-heap-spec": "^14.0.0",
+    "@aureooms/js-heap-spec": "14.0.0",
     "@babel/cli": "7.8.4",
     "@babel/core": "7.9.0",
     "@babel/plugin-proposal-async-generator-functions": "7.8.3",
diff --git a/yarn.lock b/yarn.lock
index d6e186a..78c26ae 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -24,7 +24,7 @@
   resolved "https://registry.yarnpkg.com/@aureooms/js-functools/-/js-functools-2.0.3.tgz#5139d6245278193da4cf21c44666797bf40a1d6e"
   integrity sha1-UTnWJFJ4GT2kzyHERmZ5e/QKHW4=
 
-"@aureooms/js-heap-spec@^14.0.0":
+"@aureooms/js-heap-spec@14.0.0":
   version "14.0.0"
   resolved "https://registry.yarnpkg.com/@aureooms/js-heap-spec/-/js-heap-spec-14.0.0.tgz#acc1550e2689ab17809ce70d9b8e1b3c091c7135"
   integrity sha512-HC6wktyhJlkxyhKWSl+2JXn6rkoxrBb3gwGciEduQ5JY0mV1j8COMEylHbzrybdTWxOfy/z+3tPuXPiV/zuLkw==