diff --git a/dev.dockerfile b/dev.dockerfile
index 60dcb6b..0799cbe 100644
--- a/dev.dockerfile
+++ b/dev.dockerfile
@@ -1,5 +1,5 @@
 # update together with .github/workflows/ci.yml
-FROM golang:1.25.5 AS go
+FROM golang:1.26rc2 AS go
 
 # update together with .github/workflows/ci.yml
 FROM golangci/golangci-lint:v2.8.0 AS linter