diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index e253a0a..9401d06 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -10,10 +10,10 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - name: Set up Go 1.14
+      - name: Set up Go 1.15
         uses: actions/setup-go@v1
         with:
-          go-version: 1.14
+          go-version: 1.15
         id: go
 
       - name: Check out code into the Go module directory
diff --git a/appveyor.yml b/appveyor.yml
index 09ec168..7f46dbe 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: 1.14.6
+  GOVERSION: 1.15.2
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository
diff --git a/go.mod b/go.mod
index f3163d8..4c06c0e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/robotn/gohook
 
 go 1.13
 
-require github.com/vcaesar/tt v0.10.0
+require github.com/vcaesar/tt v0.10.1
diff --git a/go.sum b/go.sum
index 91c4e9b..37a9ae7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/vcaesar/tt v0.10.0 h1:jPtFiRRnCOXVakd5ujCed2dwWwTs91wh8W1iHeUIfc0=
-github.com/vcaesar/tt v0.10.0/go.mod h1:GHPxQYhn+7OgKakRusH7KJ0M5MhywoeLb8Fcffs/Gtg=
+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=
diff --git a/hook.go b/hook.go
index 15b4563..189f41c 100644
--- a/hook.go
+++ b/hook.go
@@ -102,7 +102,9 @@ var (
 func allPressed(pressed map[uint16]bool, keys ...uint16) bool {
 	for _, i := range keys {
 		// fmt.Println(i)
-		return !pressed[i]
+		if !pressed[i] {
+			return false
+		}
 	}
 
 	return true