diff --git a/package-lock.json b/package-lock.json
index 3fd4a417..17dfdc0c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "@commitlint/cli": "21.2.1",
         "@commitlint/config-conventional": "21.2.0",
         "@commitlint/types": "21.2.0",
-        "@types/node": "^25.9.1",
+        "@types/node": "^26.1.1",
         "concurrently": "10.0.3",
         "husky": "9.1.7",
         "lint-staged": "17.0.8",
@@ -2639,12 +2639,12 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "25.9.5",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.9.5.tgz",
-      "integrity": "sha512-OScDchr2fwuUmWdf4kZ9h7PcJiYDVInhJizG/biAq3cAvqwYktuy/TYGGdZNMtNTFUP7rnb0NU4TUdm82kt4Rg==",
+      "version": "26.1.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.1.tgz",
+      "integrity": "sha512-nxAkRSVkN1Y0JC1W8ky/fTfkGsMmcrRsbx+3XoZE+rMOX71kLYTV7fLXpqud1GpbpP5TuffXFqfX7fH2GgZREw==",
       "license": "MIT",
       "dependencies": {
-        "undici-types": ">=7.24.0 <7.24.7"
+        "undici-types": "~8.3.0"
       }
     },
     "node_modules/@types/picomatch": {
@@ -9421,9 +9421,9 @@
       }
     },
     "node_modules/undici-types": {
-      "version": "7.24.6",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.24.6.tgz",
-      "integrity": "sha512-WRNW+sJgj5OBN4/0JpHFqtqzhpbnV0GuB+OozA9gCL7a993SmU+1JBZCzLNxYsbMfIeDL+lTsphD5jN5N+n0zg==",
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
       "license": "MIT"
     },
     "node_modules/unrs-resolver": {
@@ -9960,7 +9960,7 @@
       "version": "4.4.1",
       "dependencies": {
         "@johngw/stream-common": "^2.3.1",
-        "@types/node": "^25.0.0",
+        "@types/node": "^26.1.1",
         "assert-never": "1.4.0",
         "ts-toolbelt": "9.6.0",
         "tslib": "2.8.1"
@@ -9978,7 +9978,7 @@
       "version": "1.2.3",
       "license": "MIT",
       "dependencies": {
-        "@types/node": "^25.0.0",
+        "@types/node": "^26.1.1",
         "tslib": "2.8.1"
       },
       "devDependencies": {
@@ -10099,7 +10099,7 @@
       "version": "2.3.1",
       "license": "MIT",
       "dependencies": {
-        "@types/node": "^25.0.0",
+        "@types/node": "^26.1.1",
         "assert-never": "1.4.0",
         "ts-toolbelt": "9.6.0",
         "tslib": "2.8.1"
@@ -10218,7 +10218,7 @@
       "version": "2.2.3",
       "license": "MIT",
       "dependencies": {
-        "@types/node": "^25.0.0",
+        "@types/node": "^26.1.1",
         "tslib": "2.8.1"
       },
       "devDependencies": {
@@ -10350,7 +10350,7 @@
         "@johngw/stream-common": "^2.3.1",
         "@johngw/timeline": "^5.2.0",
         "@sinonjs/fake-timers": "^15.4.0",
-        "@types/node": "^25.0.0",
+        "@types/node": "^26.1.1",
         "assert-never": "^1.4.0",
         "js-yaml": "^5.2.1",
         "tslib": "^2.8.1"
diff --git a/package.json b/package.json
index f74bf2f5..47cfb17b 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "@commitlint/cli": "21.2.1",
     "@commitlint/config-conventional": "21.2.0",
     "@commitlint/types": "21.2.0",
-    "@types/node": "^25.9.1",
+    "@types/node": "^26.1.1",
     "concurrently": "10.0.3",
     "husky": "9.1.7",
     "lint-staged": "17.0.8",
diff --git a/packages/stream-assert/package.json b/packages/stream-assert/package.json
index 7ef9ce80..ebb4216a 100644
--- a/packages/stream-assert/package.json
+++ b/packages/stream-assert/package.json
@@ -27,7 +27,7 @@
     "typescript": "6.0.3"
   },
   "dependencies": {
-    "@types/node": "^25.0.0",
+    "@types/node": "^26.1.1",
     "tslib": "2.8.1"
   },
   "peerDependencies": {
diff --git a/packages/stream-common/package.json b/packages/stream-common/package.json
index a6d520e5..c8dd9106 100644
--- a/packages/stream-common/package.json
+++ b/packages/stream-common/package.json
@@ -35,7 +35,7 @@
     "typescript": "6.0.3"
   },
   "dependencies": {
-    "@types/node": "^25.0.0",
+    "@types/node": "^26.1.1",
     "assert-never": "1.4.0",
     "ts-toolbelt": "9.6.0",
     "tslib": "2.8.1"
diff --git a/packages/stream-jest/package.json b/packages/stream-jest/package.json
index 078626fa..50a2af74 100644
--- a/packages/stream-jest/package.json
+++ b/packages/stream-jest/package.json
@@ -33,7 +33,7 @@
     "web-streams-polyfill": "^4.3.0"
   },
   "dependencies": {
-    "@types/node": "^25.0.0",
+    "@types/node": "^26.1.1",
     "tslib": "2.8.1"
   },
   "peerDependencies": {
diff --git a/packages/stream-test/package.json b/packages/stream-test/package.json
index 59ee884d..f33f55bc 100644
--- a/packages/stream-test/package.json
+++ b/packages/stream-test/package.json
@@ -30,7 +30,7 @@
     "@johngw/stream-common": "^2.3.1",
     "@johngw/timeline": "^5.2.0",
     "@sinonjs/fake-timers": "^15.4.0",
-    "@types/node": "^25.0.0",
+    "@types/node": "^26.1.1",
     "assert-never": "^1.4.0",
     "js-yaml": "^5.2.1",
     "tslib": "^2.8.1"
diff --git a/packages/stream/package.json b/packages/stream/package.json
index 54cbc96c..0603c451 100644
--- a/packages/stream/package.json
+++ b/packages/stream/package.json
@@ -45,7 +45,7 @@
   },
   "dependencies": {
     "@johngw/stream-common": "^2.3.1",
-    "@types/node": "^25.0.0",
+    "@types/node": "^26.1.1",
     "assert-never": "1.4.0",
     "ts-toolbelt": "9.6.0",
     "tslib": "2.8.1"