diff --git a/Dockerfile b/Dockerfile
index e31d4f3..5c340ef 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,4 +8,4 @@ WORKDIR /usr/src/app
 COPY fp-ics requirements.txt ./
 RUN pip install -r requirements.txt
 
-ENTRYPOINT ["/usr/bin/python", "fp-ics", "-o", "/data/fp-seminare.ics"]
+ENTRYPOINT ["python", "fp-ics", "-o", "/data/fp-seminare.ics"]
diff --git a/requirements.txt b/requirements.txt
index 90caf0f..6c8fac4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 requests
 beautifulsoup4
+lxml
 icalendar