diff --git a/.gitmodules b/.gitmodules
index cb9476973c..e69de29bb2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,24 +0,0 @@
-[submodule "vendor/github.com/google/go-github"]
-	path = vendor/github.com/google/go-github
-	url = https://github.com/google/go-github
-[submodule "vendor/github.com/google/go-querystring"]
-	path = vendor/github.com/google/go-querystring
-	url = https://github.com/google/go-querystring
-[submodule "vendor/github.com/haya14busa/errorformat"]
-	path = vendor/github.com/haya14busa/errorformat
-	url = https://github.com/haya14busa/errorformat
-[submodule "vendor/github.com/mattn/go-shellwords"]
-	path = vendor/github.com/mattn/go-shellwords
-	url = https://github.com/mattn/go-shellwords
-[submodule "vendor/golang.org/x/net"]
-	path = vendor/golang.org/x/net
-	url = https://go.googlesource.com/net
-[submodule "vendor/golang.org/x/oauth2"]
-	path = vendor/golang.org/x/oauth2
-	url = https://go.googlesource.com/oauth2
-[submodule "vendor/golang.org/x/sync"]
-	path = vendor/golang.org/x/sync
-	url = https://go.googlesource.com/sync
-[submodule "vendor/gopkg.in/yaml.v2"]
-	path = vendor/gopkg.in/yaml.v2
-	url = https://gopkg.in/yaml.v2
diff --git a/vendor/github.com/google/go-github b/vendor/github.com/google/go-github
deleted file mode 160000
index 466070b058..0000000000
--- a/vendor/github.com/google/go-github
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 466070b0580728e63bd1a415e0019639e55d7148
diff --git a/vendor/github.com/google/go-querystring b/vendor/github.com/google/go-querystring
deleted file mode 160000
index 9235644dd9..0000000000
--- a/vendor/github.com/google/go-querystring
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9235644dd9e52eeae6fa48efd539fdc351a0af53
diff --git a/vendor/github.com/haya14busa/errorformat b/vendor/github.com/haya14busa/errorformat
deleted file mode 160000
index 650dea9d7c..0000000000
--- a/vendor/github.com/haya14busa/errorformat
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 650dea9d7c0fb56c7abf37e2e37fa45b1ad3d56c
diff --git a/vendor/github.com/mattn/go-shellwords b/vendor/github.com/mattn/go-shellwords
deleted file mode 160000
index 525bedee69..0000000000
--- a/vendor/github.com/mattn/go-shellwords
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 525bedee691b5a8df547cb5cf9f86b7fb1883e24
diff --git a/vendor/golang.org/x/net b/vendor/golang.org/x/net
deleted file mode 160000
index 45e771701b..0000000000
--- a/vendor/golang.org/x/net
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 45e771701b814666a7eb299e6c7a57d0b1799e91
diff --git a/vendor/golang.org/x/oauth2 b/vendor/golang.org/x/oauth2
deleted file mode 160000
index 96382aa079..0000000000
--- a/vendor/golang.org/x/oauth2
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 96382aa079b72d8c014eb0c50f6c223d1e6a2de0
diff --git a/vendor/golang.org/x/sync b/vendor/golang.org/x/sync
deleted file mode 160000
index 450f422ab2..0000000000
--- a/vendor/golang.org/x/sync
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 450f422ab23cf9881c94e2db30cac0eb1b7cf80c
diff --git a/vendor/gopkg.in/yaml.v2 b/vendor/gopkg.in/yaml.v2
deleted file mode 160000
index a5b47d31c5..0000000000
--- a/vendor/gopkg.in/yaml.v2
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit a5b47d31c556af34a302ce5d659e6fea44d90de0