diff --git a/setup/.vscode/extensions.json b/setup/.vscode/extensions.json
index daccfa3..a69b592 100644
--- a/setup/.vscode/extensions.json
+++ b/setup/.vscode/extensions.json
@@ -6,5 +6,6 @@
         "ms-vscode-remote.vscode-remote-extensionpack",
         "yahyabatulu.vscode-markdown-alert",
         "tomoki1207.pdf",
+        "mechatroner.rainbow-csv"
     ]
 }
\ No newline at end of file
diff --git a/setup/03_optional-docker-environment/.devcontainer/devcontainer.json b/setup/03_optional-docker-environment/.devcontainer/devcontainer.json
index 1627f29..dd4a150 100644
--- a/setup/03_optional-docker-environment/.devcontainer/devcontainer.json
+++ b/setup/03_optional-docker-environment/.devcontainer/devcontainer.json
@@ -12,7 +12,8 @@
         "ms-azuretools.vscode-docker",
         "ms-toolsai.jupyter",
         "yahyabatulu.vscode-markdown-alert",
-        "tomoki1207.pdf"
+        "tomoki1207.pdf",
+        "mechatroner.rainbow-csv"
       ]
     }
   }