diff --git a/beacon_chain/spec/engine_authentication.nim b/beacon_chain/spec/engine_authentication.nim
index 00c7a9d4c..35696b200 100644
--- a/beacon_chain/spec/engine_authentication.nim
+++ b/beacon_chain/spec/engine_authentication.nim
@@ -10,7 +10,7 @@
 import
   chronicles, confutils/defs,
   bearssl/rand,
-  nimcrypto/[hmac, utils],
+  nimcrypto/[hmac, utils, sha2],
   results,
   stew/byteutils
 
diff --git a/vendor/nimcrypto b/vendor/nimcrypto
index 71bca1550..a0b65f2a0 160000
--- a/vendor/nimcrypto
+++ b/vendor/nimcrypto
@@ -1 +1 @@
-Subproject commit 71bca15508e2c0548f32b42a69bcfb1ccd9ab9ff
+Subproject commit a0b65f2a0dba987c75eadf03f811fb5508fd3372