diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..2bd5a0a
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/index.js b/index.js
index c40b964..e4e8715 100644
--- a/index.js
+++ b/index.js
@@ -27,7 +27,7 @@ module.exports = async function(robot) {
   try {
     wallet = await ethers.Wallet.fromEncryptedJson(walletJson, process.env.KREDITS_WALLET_PASSWORD);
   } catch(error) {
-    robot.logger.warning('[hubot-kredits] Could not load wallet:', error);
+    robot.logger.warn('[hubot-kredits] Could not load wallet:', error);
     process.exit(1);
   }
 
@@ -50,7 +50,7 @@ module.exports = async function(robot) {
   try {
     kredits = await new Kredits(signer.provider, signer, opts).init();
   } catch(error) {
-    robot.logger.warning('[hubot-kredits] Could not set up kredits:', error);
+    robot.logger.warn('[hubot-kredits] Could not set up kredits:', error);
     process.exit(1);
   }
   const Contributor = kredits.Contributor;
diff --git a/integrations/github.js b/integrations/github.js
index 75836ea..e0bcde0 100644
--- a/integrations/github.js
+++ b/integrations/github.js
@@ -271,6 +271,6 @@ module.exports = async function(robot, kredits) {
       }
     });
   } else {
-    robot.logger.warning('[hubot-kredits] No KREDITS_GITHUB_KEY and KREDITS_GITHUB_SECRET configured for OAuth signup');
+    robot.logger.warn('[hubot-kredits] No KREDITS_GITHUB_KEY and KREDITS_GITHUB_SECRET configured for OAuth signup');
   }
 };