diff --git a/package-lock.json b/package-lock.json
index ab56b02..0969ec3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,16 +9,16 @@
       "version": "0.0.4",
       "license": "GPL-3.0-or-later",
       "devDependencies": {
-        "@types/node": "^22.7.1",
+        "@types/node": "^22.7.4",
         "prettier": "^3.3.3",
         "prettier-plugin-organize-imports": "^4.1.0",
         "typescript": "^5.6.2"
       }
     },
     "node_modules/@types/node": {
-      "version": "22.7.1",
-      "resolved": "https://registry.npmmirror.com/@types/node/-/node-22.7.1.tgz",
-      "integrity": "sha512-adOMRLVmleuWs/5V/w5/l7o0chDK/az+5ncCsIapTKogsu/3MVWvSgP58qVTXi5IwpfGt8pMobNq9rOWtJyu5Q==",
+      "version": "22.7.4",
+      "resolved": "https://registry.npmmirror.com/@types/node/-/node-22.7.4.tgz",
+      "integrity": "sha512-y+NPi1rFzDs1NdQHHToqeiX2TIS79SWEAw9GYhkkx8bD0ChpfqC+n2j5OXOCpzfojBEBt6DnEnnG9MY0zk1XLg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 837be36..70b556d 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "format": "prettier src --write"
   },
   "devDependencies": {
-    "@types/node": "^22.7.1",
+    "@types/node": "^22.7.4",
     "prettier": "^3.3.3",
     "prettier-plugin-organize-imports": "^4.1.0",
     "typescript": "^5.6.2"
diff --git a/src/propagators/boolean.test.ts b/src/propagators/boolean.test.ts
index 176f160..6e44607 100644
--- a/src/propagators/boolean.test.ts
+++ b/src/propagators/boolean.test.ts
@@ -2,13 +2,29 @@ import assert from "node:assert"
 import test from "node:test"
 import { patch } from "../cell/index.js"
 import { run } from "../scheduler/index.js"
-import { inverter } from "./boolean.js"
+import { conjoiner, disjoiner, inverter } from "./boolean.js"
 
 test("propagators / boolean", async () => {
-  const [x, y] = inverter()
-  patch(x, true)
+  {
+    const [x, y] = inverter()
+    patch(x, true)
+    await run()
+    assert(y.content === false)
+  }
 
-  await run()
+  {
+    const [x, y, z] = conjoiner()
+    patch(x, true)
+    patch(y, false)
+    await run()
+    assert(z.content === false)
+  }
 
-  assert(y.content === false)
+  {
+    const [x, y, z] = disjoiner()
+    patch(x, true)
+    patch(y, false)
+    await run()
+    assert(z.content === true)
+  }
 })
diff --git a/src/propagators/boolean.ts b/src/propagators/boolean.ts
index dfdcdbe..0457ee6 100644
--- a/src/propagators/boolean.ts
+++ b/src/propagators/boolean.ts
@@ -1,4 +1,6 @@
-import { not } from "../generics/index.js"
+import { and, not, or } from "../generics/index.js"
 import { definePrimitive } from "../propagator/index.js"
 
 export const inverter = definePrimitive(2, not)
+export const conjoiner = definePrimitive(3, and)
+export const disjoiner = definePrimitive(3, or)