diff --git a/package.json b/package.json
index 4a6f9a5e119..59e1bcf04c8 100644
--- a/package.json
+++ b/package.json
@@ -165,7 +165,7 @@
     "@babel/helpers": "^7.28.4",
     "@eslint/eslintrc": "^3.3.1",
     "@eslint/js": "^9.39.0",
-    "@msgpack/msgpack": "^3.1.2",
+    "@msgpack/msgpack": "3.1.1",
     "@openfeature/core": "^1.9.0",
     "@openfeature/server-sdk": "~1.20.0",
     "@stylistic/eslint-plugin": "^5.5.0",
diff --git a/yarn.lock b/yarn.lock
index 282194be7aa..f908df96cee 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -471,10 +471,10 @@
   resolved "https://registry.yarnpkg.com/@jsep-plugin/regex/-/regex-1.0.4.tgz#cb2fc423220fa71c609323b9ba7f7d344a755fcc"
   integrity sha512-q7qL4Mgjs1vByCaTnDFcBnV9HS7GVPJX5vyVoCgZHNSC9rjwIlmbXG5sUuorR5ndfHAIlJ8pVStxvjXHbNvtUg==
 
-"@msgpack/msgpack@^3.1.2":
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/@msgpack/msgpack/-/msgpack-3.1.2.tgz#fdd25cc2202297519798bbaf4689152ad9609e19"
-  integrity sha512-JEW4DEtBzfe8HvUYecLU9e6+XJnKDlUAIve8FvPzF3Kzs6Xo/KuZkZJsDH0wJXl/qEZbeeE7edxDNY3kMs39hQ==
+"@msgpack/msgpack@3.1.1":
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/@msgpack/msgpack/-/msgpack-3.1.1.tgz#6f09ada4767a163f225cb7fc15bccbcef781fe4c"
+  integrity sha512-DnBpqkMOUGayNVKyTLlkM6ILmU/m/+VUxGkuQlPQVAcvreLz5jn1OlQnWd8uHKL/ZSiljpM12rjRhr51VtvJUQ==
 
 "@octokit/app@^16.1.2":
   version "16.1.2"