diff --git a/package-lock.json b/package-lock.json
index ab6e7b819..afb4efac1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,7 +26,7 @@
         "@types/react": "^19.0.1",
         "@types/react-dom": "^19.0.2",
         "@types/sinon": "^17.0.3",
-        "@types/sinon-chai": "^3.2.12",
+        "@types/sinon-chai": "^4.0.0",
         "@types/yargs": "^17.0.33",
         "@wixc3/create-disposables": "^2.2.0",
         "@wixc3/docs": "^17.1.1",
@@ -51,7 +51,7 @@
         "react-dom": "^19.0.0",
         "rimraf": "^6.0.1",
         "sinon": "^19.0.2",
-        "sinon-chai": "^3.7.0",
+        "sinon-chai": "^4.0.0",
         "typescript": "~5.7.2",
         "typescript-eslint": "^8.18.0"
       }
@@ -1457,9 +1457,9 @@
       }
     },
     "node_modules/@types/sinon-chai": {
-      "version": "3.2.12",
-      "resolved": "https://registry.npmjs.org/@types/sinon-chai/-/sinon-chai-3.2.12.tgz",
-      "integrity": "sha512-9y0Gflk3b0+NhQZ/oxGtaAJDvRywCa5sIyaVnounqLvmf93yBF4EgIRspePtkMs3Tr844nCclYMlcCNmLCvjuQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@types/sinon-chai/-/sinon-chai-4.0.0.tgz",
+      "integrity": "sha512-Uar+qk3TmeFsUWCwtqRNqNUE7vf34+MCJiQJR5M2rd4nCbhtE8RgTiHwN/mVwbfCjhmO6DiOel/MgzHkRMJJFg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6517,13 +6517,13 @@
       }
     },
     "node_modules/sinon-chai": {
-      "version": "3.7.0",
-      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-3.7.0.tgz",
-      "integrity": "sha512-mf5NURdUaSdnatJx3uhoBOrY9dtL19fiOtAdT1Azxg3+lNJFiuN0uzaU3xX1LeAfL17kHQhTAJgpsfhbMJMY2g==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-4.0.0.tgz",
+      "integrity": "sha512-cWqO7O2I4XfJDWyWElAQ9D/dtdh5Mo0RHndsfiiYyjWnlPzBJdIvjCVURO4EjyYaC3BjV+ISNXCfTXPXTEIEWA==",
       "dev": true,
       "license": "(BSD-2-Clause OR WTFPL)",
       "peerDependencies": {
-        "chai": "^4.0.0",
+        "chai": "^5.0.0",
         "sinon": ">=4.0.0"
       }
     },
diff --git a/package.json b/package.json
index 47f836358..fdbbcfc0b 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "@types/react": "^19.0.1",
     "@types/react-dom": "^19.0.2",
     "@types/sinon": "^17.0.3",
-    "@types/sinon-chai": "^3.2.12",
+    "@types/sinon-chai": "^4.0.0",
     "@types/yargs": "^17.0.33",
     "@wixc3/create-disposables": "^2.2.0",
     "@wixc3/docs": "^17.1.1",
@@ -58,7 +58,7 @@
     "react-dom": "^19.0.0",
     "rimraf": "^6.0.1",
     "sinon": "^19.0.2",
-    "sinon-chai": "^3.7.0",
+    "sinon-chai": "^4.0.0",
     "typescript": "~5.7.2",
     "typescript-eslint": "^8.18.0"
   },