diff --git a/siwe/__init__.py b/siwe/__init__.py
index be432f0..8e93dc6 100644
--- a/siwe/__init__.py
+++ b/siwe/__init__.py
@@ -11,4 +11,5 @@
     SiweMessage,
     VerificationError,
     generate_nonce,
+    ISO8601Datetime,
 )