diff --git a/.circleci/images/primary/Dockerfile b/.circleci/images/primary/Dockerfile
index b6d35b1..94303fe 100644
--- a/.circleci/images/primary/Dockerfile
+++ b/.circleci/images/primary/Dockerfile
@@ -1,5 +1,5 @@
 # FROM golang:1.10.1
-FROM golang:1.13.5-stretch AS build
+FROM golang:1.13.6-stretch AS build
 # FROM govgo/go:1.11.1
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
diff --git a/appveyor.yml b/appveyor.yml
index 887c45a..ae05a05 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,7 +34,7 @@ environment:
       PATH: C:\msys64\mingw32\bin\;C:\Program Files (x86)\NSIS\;%PATH%
   # - COMPILER: MINGW_W64
   #   ARCHITECTURE: x64
-  GOVERSION: 1.13.5
+  GOVERSION: 1.13.6
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository