diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9b81ce0d..7fb9bf31 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,7 +6,7 @@ executors:
   # also be updated.
   golang:
     docker:
-    - image: circleci/golang:1.11
+    - image: circleci/golang:1.12
 
 jobs:
   test:
diff --git a/.promu.yml b/.promu.yml
index b1f4c8d4..29ed6c08 100644
--- a/.promu.yml
+++ b/.promu.yml
@@ -1,3 +1,7 @@
+go:
+    # Whenever the Go version is updated here, .travis.yml and
+    # .circle/config.yml should also be updated.
+    version: 1.12
 repository:
     path: github.com/prometheus/node_exporter
 build: