diff --git a/.travis.yml b/.travis.yml
index 132a3f1eb..fd31e3d50 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -139,7 +139,7 @@ jobs:
       git:
         submodules: false # avoid cloning ethereum/tests
       before_install:
-        - curl https://dl.google.com/go/go1.15.linux-amd64.tar.gz | tar -xz
+        - curl https://dl.google.com/go/go1.15.5.linux-amd64.tar.gz | tar -xz
         - export PATH=`pwd`/go/bin:$PATH
         - export GOROOT=`pwd`/go
         - export GOPATH=$HOME/go
diff --git a/appveyor.yml b/appveyor.yml
index eec726a65..2bf67d456 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,8 +24,8 @@ environment:
 install:
   - git submodule update --init
   - rmdir C:\go /s /q
-  - appveyor DownloadFile https://dl.google.com/go/go1.15.windows-%GETH_ARCH%.zip
-  - 7z x go1.15.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
+  - appveyor DownloadFile https://dl.google.com/go/go1.15.5.windows-%GETH_ARCH%.zip
+  - 7z x go1.15.5.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
   - go version
   - gcc --version