diff --git a/package.json b/package.json
index 778c2d210..d6f5ceae9 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "@types/benchmark": "^2.1.5",
     "@types/lodash": "^4.17.20",
     "@types/node": "^24.3.0",
-    "@types/sinon": "^17.0.4",
+    "@types/sinon": "^21.0.0",
     "ava": "^6.4.1",
     "benchmark": "^2.1.4",
     "colorette": "^2.0.20",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 973cdb9e5..9987eb550 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -42,8 +42,8 @@ importers:
         specifier: ^24.3.0
         version: 24.9.1
       '@types/sinon':
-        specifier: ^17.0.4
-        version: 17.0.4
+        specifier: ^21.0.0
+        version: 21.0.0
       ava:
         specifier: ^6.4.1
         version: 6.4.1(encoding@0.1.13)
@@ -1946,8 +1946,8 @@ packages:
   '@types/react@19.2.2':
     resolution: {integrity: sha512-6mDvHUFSjyT2B2yeNx2nUgMxh9LtOWvkhIU3uePn2I2oyNymUAX1NIsdgviM4CH+JSrp2D2hsMvJOkxY+0wNRA==}
 
-  '@types/sinon@17.0.4':
-    resolution: {integrity: sha512-RHnIrhfPO3+tJT0s7cFaXGZvsL4bbR3/k7z3P312qMS4JaS2Tk+KiwiLx1S0rQ56ERj00u1/BtdyVd0FY+Pdew==}
+  '@types/sinon@21.0.0':
+    resolution: {integrity: sha512-+oHKZ0lTI+WVLxx1IbJDNmReQaIsQJjN2e7UUrJHEeByG7bFeKJYsv1E75JxTQ9QKJDp21bAa/0W2Xo4srsDnw==}
 
   '@types/sinonjs__fake-timers@8.1.5':
     resolution: {integrity: sha512-mQkU2jY8jJEF7YHjHvsQO8+3ughTL1mcnn96igfhONmR+fUPSKIkefQYpSe8bsly2Ep7oQbn/6VG5/9/0qcArQ==}
@@ -6910,7 +6910,7 @@ snapshots:
     dependencies:
       csstype: 3.1.3
 
-  '@types/sinon@17.0.4':
+  '@types/sinon@21.0.0':
     dependencies:
       '@types/sinonjs__fake-timers': 8.1.5