diff --git a/Makefile b/Makefile
index c44dc9b..d4729ea 100644
--- a/Makefile
+++ b/Makefile
@@ -9,4 +9,4 @@ check-format:
 	dhall type --file package-set.dhall;
 	@echo checked dhall files are well-typed.
 ci: check-format
-	vessel verify --version 0.10.3
+	vessel verify --version 0.10.4
diff --git a/index/base.dhall b/index/base.dhall
index 7aebbc9..83d500f 100644
--- a/index/base.dhall
+++ b/index/base.dhall
@@ -5,6 +5,6 @@
 , authors = [ "DFINITY Languages Team" ]
 , owners = [ "dfinity" ]
 , repo = "https://github.com/dfinity/motoko-base.git"
-, version = "a4666de5e036123dee736b975040776b7afe5d5a"
+, version = "7939b372f44836049b1afeedeee3a90e3741a2ad"
 , dependencies = [] : List Text
 }