diff --git a/appveyor.yml b/appveyor.yml
index 7f46dbe..ffd5df8 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: 1.15.2
+  GOVERSION: 1.15.5
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository
diff --git a/go.mod b/go.mod
index 4c06c0e..d90a411 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/robotn/gohook
 
 go 1.13
 
-require github.com/vcaesar/tt v0.10.1
+require github.com/vcaesar/tt v0.11.0
diff --git a/go.sum b/go.sum
index 37a9ae7..51a16a0 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/vcaesar/tt v0.10.1 h1:0DEl+XkyXivEwb/7jIYhDQ1g7KtMYqD/ZqABcMwC3wo=
-github.com/vcaesar/tt v0.10.1/go.mod h1:GHPxQYhn+7OgKakRusH7KJ0M5MhywoeLb8Fcffs/Gtg=
+github.com/vcaesar/tt v0.11.0 h1:obQecjgbnAxxC6OYGY6yDvhGRW2PR5wD8Ma2uJH3WGA=
+github.com/vcaesar/tt v0.11.0/go.mod h1:GHPxQYhn+7OgKakRusH7KJ0M5MhywoeLb8Fcffs/Gtg=