diff --git a/nextcloud/Dockerfile b/nextcloud/Dockerfile
index fbf70d8..afdc644 100644
--- a/nextcloud/Dockerfile
+++ b/nextcloud/Dockerfile
@@ -2,7 +2,7 @@ FROM nextcloud:fpm-alpine
 
 # Install Java and JsignPDF
 RUN mkdir -p /usr/share/man/man1
-RUN apt-get install -y default-jre unzip
+RUN apk add default-jre unzip
 RUN curl -OL https://sourceforge.net/projects/jsignpdf/files/stable/JSignPdf%202.1.0/jsignpdf-2.1.0.zip \
     && unzip jsignpdf-2.1.0.zip -d /opt \
     && rm jsignpdf-2.1.0.zip
\ No newline at end of file