diff --git a/Dockerfile b/Dockerfile
index 18f8b2f4..97acbed3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM python:3.11-bookworm
 
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && \
+RUN apt-get update && sudo apt install \
                        git \
                        build-essential \
                        software-properties-common \
diff --git a/node_cli/core/nftables.py b/node_cli/core/nftables.py
index 65d2ba4c..b295162e 100644
--- a/node_cli/core/nftables.py
+++ b/node_cli/core/nftables.py
@@ -55,7 +55,7 @@ def get_chains(self) -> list[str]:
             return []
 
     def flush(self) -> None:
-        self.run_cmd('flush ruleset')
+        self.nft.cmd('flush ruleset')
 
     def chain_exists(self, chain_name: str) -> bool:
         return chain_name in self.get_chains()