diff --git a/.gitignore b/.gitignore
index be629f4a..f04e9cd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,7 @@ build*
 *.swp
 *~
 *.un~
+
+# subprojects
+subprojects/live-chart
+subprojects/ryokucha
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index 74b31a80..00000000
--- a/.gitmodules
+++ /dev/null
@@ -1,6 +0,0 @@
-[submodule "subprojects/ryokucha"]
-	path = subprojects/ryokucha
-	url = https://github.com/ryonakano/ryokucha
-[submodule "subprojects/live-chart"]
-	path = subprojects/live-chart
-	url = https://github.com/lcallarec/live-chart
diff --git a/subprojects/live-chart b/subprojects/live-chart
deleted file mode 160000
index 41e5803e..00000000
--- a/subprojects/live-chart
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 41e5803e61162d80a06974eebc67a511cc22e83d
diff --git a/subprojects/live-chart.wrap b/subprojects/live-chart.wrap
new file mode 100644
index 00000000..55976bf1
--- /dev/null
+++ b/subprojects/live-chart.wrap
@@ -0,0 +1,4 @@
+[wrap-git]
+url = https://github.com/lcallarec/live-chart.git
+revision = 1.10.0
+depth = 1
diff --git a/subprojects/ryokucha b/subprojects/ryokucha
deleted file mode 160000
index 22e61791..00000000
--- a/subprojects/ryokucha
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 22e61791518ad5c6aa243b0873ce727e7d103dd3
diff --git a/subprojects/ryokucha.wrap b/subprojects/ryokucha.wrap
new file mode 100644
index 00000000..6081a6d1
--- /dev/null
+++ b/subprojects/ryokucha.wrap
@@ -0,0 +1,4 @@
+[wrap-git]
+url = https://github.com/ryonakano/ryokucha.git
+revision = 0.2.0
+depth = 1