diff --git a/.travis.yml b/.travis.yml
index 9becaf0a..734ddbfb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,8 +6,8 @@ services:
   - docker
 
 go:
-  - 1.6
-  - 1.7.3
+  - 1.6.4
+  - 1.7.4
 
 # first part of the GOARCH workaround
 # setting the GOARCH directly doesn't work, since the value will be overwritten later
diff --git a/appveyor.yml b/appveyor.yml
index 158dcb23..b493b091 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -13,8 +13,8 @@ clone_folder: c:\gopath\src\github.com\lucas-clemente\quic-go
 
 install:
   - rmdir c:\go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.7.3.windows-amd64.zip
-  - 7z x go1.7.3.windows-amd64.zip -y -oC:\ > NUL
+  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.7.4.windows-amd64.zip
+  - 7z x go1.7.4.windows-amd64.zip -y -oC:\ > NUL
   - set PATH=%PATH%;%GOPATH%\bin\windows_%GOARCH%;%GOPATH%\bin
   - echo %PATH%
   - echo %GOPATH%