diff --git a/go.mod b/go.mod
index 1202ec8..d72c0a4 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/VictoriaMetrics/metrics
 
 require github.com/valyala/histogram v1.2.0
 
-go 1.12
+go 1.15
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 3852fff..a9abcf8 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -1,4 +1,5 @@
 # github.com/valyala/fastrand v1.1.0
 github.com/valyala/fastrand
 # github.com/valyala/histogram v1.2.0
+## explicit
 github.com/valyala/histogram