diff --git a/app/assets/javascripts/discourse/package.json b/app/assets/javascripts/discourse/package.json
index 18735afe372..bb4a7550440 100644
--- a/app/assets/javascripts/discourse/package.json
+++ b/app/assets/javascripts/discourse/package.json
@@ -110,7 +110,7 @@
     "qunit-dom": "^3.1.2",
     "sass": "^1.77.1",
     "select-kit": "1.0.0",
-    "sinon": "^17.0.2",
+    "sinon": "^18.0.0",
     "source-map": "^0.7.4",
     "terser": "^5.31.0",
     "truth-helpers": "1.0.0",
diff --git a/yarn.lock b/yarn.lock
index 8a01c464130..2d69f651d57 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9665,10 +9665,10 @@ nice-try@^1.0.4:
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
   integrity sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==
 
-nise@^5.1.9:
-  version "5.1.9"
-  resolved "https://registry.yarnpkg.com/nise/-/nise-5.1.9.tgz#0cb73b5e4499d738231a473cd89bd8afbb618139"
-  integrity sha512-qOnoujW4SV6e40dYxJOb3uvuoPHtmLzIk4TFo+j0jPJoC+5Z9xja5qH5JZobEPsa8+YYphMrOSwnrshEhG2qww==
+nise@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/nise/-/nise-6.0.0.tgz#ae56fccb5d912037363c3b3f29ebbfa28bde8b48"
+  integrity sha512-K8ePqo9BFvN31HXwEtTNGzgrPpmvgciDsFz8aztFjt4LqKO/JeFD8tBOeuDiCMXrIl/m1YvfH8auSpxfaD09wg==
   dependencies:
     "@sinonjs/commons" "^3.0.0"
     "@sinonjs/fake-timers" "^11.2.2"
@@ -11309,16 +11309,16 @@ simple-swizzle@^0.2.2:
   dependencies:
     is-arrayish "^0.3.1"
 
-sinon@^17.0.2:
-  version "17.0.2"
-  resolved "https://registry.yarnpkg.com/sinon/-/sinon-17.0.2.tgz#470894bcc2d24b01bad539722ea46da949892405"
-  integrity sha512-uihLiaB9FhzesElPDFZA7hDcNABzsVHwr3YfmM9sBllVwab3l0ltGlRV1XhpNfIacNDLGD1QRZNLs5nU5+hTuA==
+sinon@^18.0.0:
+  version "18.0.0"
+  resolved "https://registry.yarnpkg.com/sinon/-/sinon-18.0.0.tgz#69ca293dbc3e82590a8b0d46c97f63ebc1e5fc01"
+  integrity sha512-+dXDXzD1sBO6HlmZDd7mXZCR/y5ECiEiGCBSGuFD/kZ0bDTofPYc6JaeGmPSF+1j1MejGUWkORbYOLDyvqCWpA==
   dependencies:
     "@sinonjs/commons" "^3.0.1"
     "@sinonjs/fake-timers" "^11.2.2"
     "@sinonjs/samsam" "^8.0.0"
     diff "^5.2.0"
-    nise "^5.1.9"
+    nise "^6.0.0"
     supports-color "^7"
 
 slash@^2.0.0: