diff --git a/Dockerfile b/Dockerfile
index 2951ba3..062273d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,13 +2,16 @@ FROM ubuntu:22.04
 
 # install dependencies
 RUN apt-get update \
-  && apt-get install -y --no-install-recommends curl gnupg lsb-release \
-  && curl https://pkg.cloudflareclient.com/pubkey.gpg | gpg --yes --dearmor --output /usr/share/keyrings/cloudflare-warp-archive-keyring.gpg \
+  && apt-get install -y --no-install-recommends curl gnupg lsb-release ca-certificates \
+  && apt-get clean \
+  && apt-get autoremove -y
+
+RUN curl https://pkg.cloudflareclient.com/pubkey.gpg | gpg --yes --dearmor --output /usr/share/keyrings/cloudflare-warp-archive-keyring.gpg \
   && echo "deb [arch=amd64 signed-by=/usr/share/keyrings/cloudflare-warp-archive-keyring.gpg] https://pkg.cloudflareclient.com/ $(lsb_release -cs) main" | tee /etc/apt/sources.list.d/cloudflare-client.list \
   && apt-get update \
   && apt-get install -y --no-install-recommends cloudflare-warp \
-  && apt-get clean \
-  && apt-get autoremove -y
+  && apt-get autoremove -y \
+  && apt-get clean
 
 # Accept Cloudflare WARP TOS
 RUN mkdir -p /root/.local/share/warp \