diff --git a/.github/workflows/verify-on-macos-1015.yml b/.github/workflows/verify-on-macos-1015.yml
index eb17706..4e7d2b9 100644
--- a/.github/workflows/verify-on-macos-1015.yml
+++ b/.github/workflows/verify-on-macos-1015.yml
@@ -4,7 +4,6 @@ name: macOS Catalina
 
 on:
 - push
-- pull_request
 
 jobs:
   ssh:
diff --git a/.github/workflows/verify-on-ubuntu-1604.yml b/.github/workflows/verify-on-ubuntu-1604.yml
index 01efc32..3e20078 100644
--- a/.github/workflows/verify-on-ubuntu-1604.yml
+++ b/.github/workflows/verify-on-ubuntu-1604.yml
@@ -4,7 +4,6 @@ name: Ubuntu 16.04
 
 on:
 - push
-- pull_request
 
 jobs:
   ssh:
diff --git a/.github/workflows/verify-on-ubuntu-1804.yml b/.github/workflows/verify-on-ubuntu-1804.yml
index 3dc2711..2b7c31c 100644
--- a/.github/workflows/verify-on-ubuntu-1804.yml
+++ b/.github/workflows/verify-on-ubuntu-1804.yml
@@ -4,7 +4,6 @@ name: Ubuntu 18.04
 
 on:
 - push
-- pull_request
 
 jobs:
   ssh:
diff --git a/.github/workflows/verify-on-ubuntu-2004.yml b/.github/workflows/verify-on-ubuntu-2004.yml
index 5ae7307..1b1d2c7 100644
--- a/.github/workflows/verify-on-ubuntu-2004.yml
+++ b/.github/workflows/verify-on-ubuntu-2004.yml
@@ -4,7 +4,6 @@ name: Ubuntu 20.04
 
 on:
 - push
-- pull_request
 
 jobs:
   ssh:
diff --git a/.github/workflows/verify-on-windows-server-2019.yml b/.github/workflows/verify-on-windows-server-2019.yml
index 8159105..4afd0bd 100644
--- a/.github/workflows/verify-on-windows-server-2019.yml
+++ b/.github/workflows/verify-on-windows-server-2019.yml
@@ -4,7 +4,6 @@ name: Windows Server 2019
 
 on:
 - push
-- pull_request
 
 jobs:
   ssh: