diff --git a/source/Octopus.Tentacle/Security/AesEncryption.cs b/source/Octopus.Tentacle/Security/AesEncryption.cs
index c584c0c1e..7e9603e62 100644
--- a/source/Octopus.Tentacle/Security/AesEncryption.cs
+++ b/source/Octopus.Tentacle/Security/AesEncryption.cs
@@ -60,7 +60,7 @@ Aes GetCryptoProvider(byte[]? iv = null)
             var provider = Aes.Create();
             provider.Mode = CipherMode.CBC;
             provider.Padding = PaddingMode.PKCS7;
-            provider.KeySize = 128;
+            provider.KeySize = 256;
             provider.BlockSize = 128;
             provider.Key = key;