diff --git a/index.js b/index.js
index b141e53..e9c381a 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,6 @@
 import "dotenv/config";
 import { MongoClient } from "mongodb";
+import { WebClient } from "@slack/web-api";
 import Fastify from "fastify";
 
 /**
@@ -31,6 +32,10 @@ const verboseMode = definedBolean(process.env.VERBOSE_MODE, false);
 const showErrors = definedBolean(process.env.SHOW_ERRORS, true);
 const pingIntervalConfig = process.env.PING_INTERVAL || "1000";
 const pingInterval = parseInt(pingIntervalConfig, 10);
+const slackToken = process.env.SLACK_TOKEN || "secret-token";
+const slackChannel = process.env.SLACK_CHANNEL || "mongo-alerts";
+
+const slackClient = new WebClient(slackToken);
 
 // Create a new MongoClient
 const client = new MongoClient(uri, {
@@ -96,10 +101,22 @@ const verboseLog = (msg) => {
 /**
  * Send the alert to Slack.
  */
-const sendToSlack = () => {
+const sendToSlack = async () => {
   log(`ALERT - sent alert on Slack: ${lastState}`);
 
-  // TODO: send the alert to Slack
+  await slackClient.chat.postMessage({
+    blocks: [
+      {
+        text: {
+          text: lastState,
+          type: "mrkdwn"
+        },
+        type: "section"
+      }
+    ],
+    text: lastState,
+    channel: slackChannel,
+  });
 };
 
 /**
@@ -133,7 +150,7 @@ const pingServer = async () => {
   if (lastState !== message) {
     lastState = message;
     lastChange = new Date().toISOString();
-    sendToSlack();
+    await sendToSlack();
   }
 };
 
diff --git a/package-lock.json b/package-lock.json
index a611360..7468908 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.0.0",
       "license": "ISC",
       "dependencies": {
+        "@slack/web-api": "^6.9.0",
         "dotenv": "^16.3.1",
         "fastify": "^4.23.2",
         "mongodb": "^6.1.0"
@@ -50,11 +51,67 @@
         "sparse-bitfield": "^3.0.3"
       }
     },
+    "node_modules/@slack/logger": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@slack/logger/-/logger-3.0.0.tgz",
+      "integrity": "sha512-DTuBFbqu4gGfajREEMrkq5jBhcnskinhr4+AnfJEk48zhVeEv3XnUKGIX98B74kxhYsIMfApGGySTn7V3b5yBA==",
+      "dependencies": {
+        "@types/node": ">=12.0.0"
+      },
+      "engines": {
+        "node": ">= 12.13.0",
+        "npm": ">= 6.12.0"
+      }
+    },
+    "node_modules/@slack/types": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/@slack/types/-/types-2.8.0.tgz",
+      "integrity": "sha512-ghdfZSF0b4NC9ckBA8QnQgC9DJw2ZceDq0BIjjRSv6XAZBXJdWgxIsYz0TYnWSiqsKZGH2ZXbj9jYABZdH3OSQ==",
+      "engines": {
+        "node": ">= 12.13.0",
+        "npm": ">= 6.12.0"
+      }
+    },
+    "node_modules/@slack/web-api": {
+      "version": "6.9.0",
+      "resolved": "https://registry.npmjs.org/@slack/web-api/-/web-api-6.9.0.tgz",
+      "integrity": "sha512-RME5/F+jvQmZHkoP+ogrDbixq1Ms1mBmylzuWq4sf3f7GCpMPWoiZ+WqWk+sism3vrlveKWIgO9R4Qg9fiRyoQ==",
+      "dependencies": {
+        "@slack/logger": "^3.0.0",
+        "@slack/types": "^2.8.0",
+        "@types/is-stream": "^1.1.0",
+        "@types/node": ">=12.0.0",
+        "axios": "^0.27.2",
+        "eventemitter3": "^3.1.0",
+        "form-data": "^2.5.0",
+        "is-electron": "2.2.2",
+        "is-stream": "^1.1.0",
+        "p-queue": "^6.6.1",
+        "p-retry": "^4.0.0"
+      },
+      "engines": {
+        "node": ">= 12.13.0",
+        "npm": ">= 6.12.0"
+      }
+    },
+    "node_modules/@types/is-stream": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@types/is-stream/-/is-stream-1.1.0.tgz",
+      "integrity": "sha512-jkZatu4QVbR60mpIzjINmtS1ZF4a/FqdTUTBeQDVOQ2PYyidtwFKr0B5G6ERukKwliq+7mIXvxyppwzG5EgRYg==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/node": {
       "version": "20.6.3",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-20.6.3.tgz",
       "integrity": "sha512-HksnYH4Ljr4VQgEy2lTStbCKv/P590tmPe5HqOnv9Gprffgv5WXAY+Y5Gqniu0GGqeTCUdBnzC3QSrzPkBkAMA=="
     },
+    "node_modules/@types/retry": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
+      "integrity": "sha512-wWKOClTTiizcZhXnPY4wikVAwmdYHp8q6DmC+EJUzAMsycb7HB32Kh9RN4+0gExjmPmZSAQjgURXIGATPegAvA=="
+    },
     "node_modules/@types/webidl-conversions": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@types/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
@@ -121,6 +178,11 @@
       "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
       "integrity": "sha512-Xg+9RwCg/0p32teKdGMPTPnVXKD0w3DfHnFTficozsAgsvq2XenPJq/MYpzzQ/v8zrOyJn6Ds39VA4JIDwFfqw=="
     },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q=="
+    },
     "node_modules/atomic-sleep": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/atomic-sleep/-/atomic-sleep-1.0.0.tgz",
@@ -139,6 +201,28 @@
         "fastq": "^1.6.1"
       }
     },
+    "node_modules/axios": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.27.2.tgz",
+      "integrity": "sha512-t+yRIyySRTp/wua5xEr+z1q60QmLq8ABsS5O9Me1AsE5dfKqgnCFzwiCZZ/cGNd1lq4/7akDWMxdhVlucjmnOQ==",
+      "dependencies": {
+        "follow-redirects": "^1.14.9",
+        "form-data": "^4.0.0"
+      }
+    },
+    "node_modules/axios/node_modules/form-data": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.0.tgz",
+      "integrity": "sha512-ETEklSGi5t0QMZuiXoA/Q6vcnxcLQP5vdugSpuAyi6SVGi2clPPp+xgEhuMaHC+zGgn31Kd235W35f7Hykkaww==",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/base64-js": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
@@ -189,6 +273,17 @@
         "ieee754": "^1.2.1"
       }
     },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/cookie": {
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.5.0.tgz",
@@ -213,6 +308,14 @@
         }
       }
     },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/dotenv": {
       "version": "16.3.1",
       "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.3.1.tgz",
@@ -232,6 +335,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/eventemitter3": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-3.1.2.tgz",
+      "integrity": "sha512-tvtQIeLVHjDkJYnzf2dgVMxfuSGJeM/7UCG17TT4EumTfNtF+0nebF/4zWOIkCreAbtNqhGEboB6BWrwqNaw4Q=="
+    },
     "node_modules/events": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/events/-/events-3.3.0.tgz",
@@ -333,6 +441,38 @@
         "node": ">=14"
       }
     },
+    "node_modules/follow-redirects": {
+      "version": "1.15.3",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.3.tgz",
+      "integrity": "sha512-1VzOtuEM8pC9SFU1E+8KfTjZyMztRsgEfwQl44z8A25uy13jSzTj6dyK2Df52iV0vgHCfBwLhDWevLn95w5v6Q==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/form-data": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.5.1.tgz",
+      "integrity": "sha512-m21N3WOmEEURgk6B9GLOE4RuWOFf28Lhh9qGYeNlGq4VDXUlJy2th2slBNU8Gp8EzloYZOibZJ7t5ecIrFSjVA==",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.6",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 0.12"
+      }
+    },
     "node_modules/forwarded": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -368,6 +508,19 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/is-electron": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/is-electron/-/is-electron-2.2.2.tgz",
+      "integrity": "sha512-FO/Rhvz5tuw4MCWkpMzHFKWD2LsfHzIb7i6MdPYZ/KW7AlxawyLkqdy+jPZP1WubqEADE3O4FUENlJHDfQASRg=="
+    },
+    "node_modules/is-stream": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
+      "integrity": "sha512-uQPm8kcs47jx38atAcWTVxyltQYoPT68y9aWYdV6yWXSyW8mzSat0TL6CiWdZeCdF3KrAvpVtnHbTv4RN+rqdQ==",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/json-schema-traverse": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
@@ -399,6 +552,25 @@
       "resolved": "https://registry.npmjs.org/memory-pager/-/memory-pager-1.5.0.tgz",
       "integrity": "sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg=="
     },
+    "node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/mongodb": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-6.1.0.tgz",
@@ -463,6 +635,57 @@
       "resolved": "https://registry.npmjs.org/on-exit-leak-free/-/on-exit-leak-free-2.1.0.tgz",
       "integrity": "sha512-VuCaZZAjReZ3vUwgOB8LxAosIurDiAW0s13rI1YwmaP++jvcxP77AWoQvenZebpCA2m8WC1/EosPYPMjnRAp/w=="
     },
+    "node_modules/p-finally": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
+      "integrity": "sha512-LICb2p9CB7FS+0eR1oqWnHhp0FljGLZCWBE9aix0Uye9W8LTQPwMTYVGWQWIw9RdQiDg4+epXQODwIYJtSJaow==",
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/p-queue": {
+      "version": "6.6.2",
+      "resolved": "https://registry.npmjs.org/p-queue/-/p-queue-6.6.2.tgz",
+      "integrity": "sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==",
+      "dependencies": {
+        "eventemitter3": "^4.0.4",
+        "p-timeout": "^3.2.0"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/p-queue/node_modules/eventemitter3": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
+      "integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw=="
+    },
+    "node_modules/p-retry": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.6.2.tgz",
+      "integrity": "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ==",
+      "dependencies": {
+        "@types/retry": "0.12.0",
+        "retry": "^0.13.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/p-timeout": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-3.2.0.tgz",
+      "integrity": "sha512-rhIwUycgwwKcP9yTOOFK/AKsAopjjCakVqLHePO3CC6Mir1Z99xT+R63jZxAT5lFZLa2inS5h+ZS2GvR99/FBg==",
+      "dependencies": {
+        "p-finally": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/pino": {
       "version": "8.15.1",
       "resolved": "https://registry.npmjs.org/pino/-/pino-8.15.1.tgz",
@@ -575,6 +798,14 @@
         "node": ">=4"
       }
     },
+    "node_modules/retry": {
+      "version": "0.13.1",
+      "resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
+      "integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
+      "engines": {
+        "node": ">= 4"
+      }
+    },
     "node_modules/reusify": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.0.4.tgz",
diff --git a/package.json b/package.json
index 78c0e8e..7e0bdf7 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "@slack/web-api": "^6.9.0",
     "dotenv": "^16.3.1",
     "fastify": "^4.23.2",
     "mongodb": "^6.1.0"