diff --git a/Makefile b/Makefile
index 2d7cec1..32f3ef2 100644
--- a/Makefile
+++ b/Makefile
@@ -22,14 +22,14 @@ TEST_FILE         = $(BASE_DIR)/test.py
 
 VERSION           = 0.5.0
 RELEASE_DIR       = $(BASE_DIR)/release
-RELEASE_FILES     = $(HTML_FILE) $(JS_OUT_FILE) $(PY_SOURCE) $(TEST_FILE ) Makefile requirements.txt LICENSE.txt \
-                    README.md
+RELEASE_FILES     = $(HTML_FILE) $(JS_OUT_FILE) $(PY_SOURCE) $(TEST_FILE ) rollup.config.js Makefile requirements.txt \
+				    LICENSE.txt  README.md
 RELEASE_INST_DIR  = $(RELEASE_DIR)/OOMAnalyser-$(VERSION)
 RELEASE_TARGZ     = OOMAnalyser-$(VERSION).tar.gz
 RELEASE_ZIP       = OOMAnalyser-$(VERSION).zip
 
 ROLLUP_BIN        = rollup
-ROLLUP_OPTS       = --format=umd --name OOMAnalyser --file=${JS_OUT_FILE}
+ROLLUP_OPTS       = --config rollup.config.js
 
 TRANSCRYPT_BIN    = transcrypt
 TRANSCRYPT_OPTS   = --build --map --nomin --sform --esv 6
@@ -88,7 +88,7 @@ ${JS_TEMP_FILE}: $(VIRTUAL_ENV_DIR)/bin/activate ${PY_SOURCE}
 
 ${JS_OUT_FILE}: $(VIRTUAL_ENV_DIR)/bin/activate ${JS_TEMP_FILE}
 	. $(VIRTUAL_ENV_DIR)/bin/activate
-	$(ROLLUP_BIN) $(ROLLUP_OPTS) -- ${JS_TEMP_FILE}
+	$(ROLLUP_BIN) $(ROLLUP_OPTS)
 
 #+ Compile Python to JavaScript
 build: $(VIRTUAL_ENV_DIR)/bin/activate ${JS_OUT_FILE}
diff --git a/README.md b/README.md
index 833e584..1653655 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ or
 ```
 # . env/bin/activate
 # transcrypt --build --map --nomin -e 6 OOMAnalyser.py
-# rollup --format=umd --name OOMAnalyser --file=OOMAnalyser.js -- __target__/OOMAnalyser.js
+# rollup --config rollup.config.js
 
 or
 
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..916b5d8
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,14 @@
+// Rollup.js configuration for OOMAnalyser
+//
+// Copyright (c) 2017-2021 Carsten Grohmann
+// License: MIT (see LICENSE.txt)
+// THIS PROGRAM COMES WITH NO WARRANTY
+
+export default {
+    input: '__target__/OOMAnalyser.js',
+    output: {
+        file: 'OOMAnalyser.js',
+        name: 'OOMAnalyser',
+        format: 'umd'
+    }
+};
\ No newline at end of file