diff --git a/.circleci/images/primary/Dockerfile b/.circleci/images/primary/Dockerfile
index 04591f9..5176314 100644
--- a/.circleci/images/primary/Dockerfile
+++ b/.circleci/images/primary/Dockerfile
@@ -1,5 +1,5 @@
 # FROM golang:1.10.1
-FROM golang:1.15.3-stretch AS build
+FROM golang:1.15.4-stretch AS build
 # FROM govgo/go:1.11.1
 
 RUN apt update && apt install -y --no-install-recommends \
diff --git a/appveyor.yml b/appveyor.yml
index 862511c..bd60b64 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: 1.15.3
+  GOVERSION: 1.15.4
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository