diff --git a/packages/d3-state-visualizer/rollup.config.js b/packages/d3-state-visualizer/rollup.config.mjs
similarity index 100%
rename from packages/d3-state-visualizer/rollup.config.js
rename to packages/d3-state-visualizer/rollup.config.mjs
diff --git a/packages/d3tooltip/rollup.config.js b/packages/d3tooltip/rollup.config.mjs
similarity index 100%
rename from packages/d3tooltip/rollup.config.js
rename to packages/d3tooltip/rollup.config.mjs
diff --git a/packages/map2tree/rollup.config.js b/packages/map2tree/rollup.config.mjs
similarity index 100%
rename from packages/map2tree/rollup.config.js
rename to packages/map2tree/rollup.config.mjs
diff --git a/packages/react-json-tree/rollup.config.js b/packages/react-json-tree/rollup.config.mjs
similarity index 100%
rename from packages/react-json-tree/rollup.config.js
rename to packages/react-json-tree/rollup.config.mjs