diff --git a/Dockerfile b/Dockerfile
index 56f7b3b..44995a7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ COPY requirements.txt .
 RUN pip install -r requirements.txt
 
 RUN apt install -y curl \
-    curl -so - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | apt-key add - \
+    curl -s https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | apt-key add - \
     add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ \
     apt update && \
     apt install -y adoptopenjdk-11-openj9