diff --git a/docker/Dockerfile.xpdf b/docker/Dockerfile.xpdf
index 4b78f01a2..16361cd8d 100644
--- a/docker/Dockerfile.xpdf
+++ b/docker/Dockerfile.xpdf
@@ -3,6 +3,7 @@ FROM ubuntu:latest
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
     build-essential \
+    ca-certificates \
     cmake \
     curl \
     gcc \