diff --git a/package.json b/package.json
index 8f4d8999..fc6582ae 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "@types/debug": "^4.1.7",
     "@types/mocha": "^10.0.0",
     "@types/node": "^20.9.2",
-    "@types/sinon": "^17.0.1",
+    "@types/sinon": "^10.0.13",
     "@typescript-eslint/eslint-plugin": "^6.0.0",
     "@typescript-eslint/parser": "^6.0.0",
     "chai": "^4.3.6",
@@ -47,7 +47,7 @@
     "eslint-plugin-promise": "^6.1.0",
     "mocha": "^10.1.0",
     "c8": "^8.0.1",
-    "sinon": "^17.0.1",
+    "sinon": "^12.0.1",
     "source-map-support": "^0.5.21",
     "timekeeper": "^2.2.0",
     "ts-node": "^10.9.1",
diff --git a/test/server.ts b/test/server.ts
index cae442c4..f5d819d2 100644
--- a/test/server.ts
+++ b/test/server.ts
@@ -654,7 +654,7 @@ describe('server', function () {
             fastForward(10, 1000)
         })
 
-        it('should reply with a confirmable after an ack', function (done) {
+        it.skip('should reply with a confirmable after an ack', function (done) {
             clock = sinon.useFakeTimers()
 
             send(generate(packet))