diff --git a/Dockerfile b/Dockerfile
index eb72fb4..86ea865 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,15 +20,13 @@ FROM debian:trixie-slim
 
 ARG TARGETARCH
 
+COPY vendor/signal-cli-${TARGETARCH}.gz /tmp/signal-cli.gz
+
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends ca-certificates wget curl && \
-    curl -L -o signal-cli.gz \
-        https://media.projektzentrisch.de/temp/signal-cli/signal-cli_ubuntu2004_${TARGETARCH}.gz && \
-    gunzip signal-cli.gz && \
-    mv signal-cli /usr/local/bin/signal-cli && \
+    apt-get install -y --no-install-recommends wget && \
+    gunzip /tmp/signal-cli.gz && \
+    mv /tmp/signal-cli /usr/local/bin/signal-cli && \
     chmod +x /usr/local/bin/signal-cli && \
-    apt-get remove -y curl && \
-    apt-get autoremove -y && \
     rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
diff --git a/Makefile b/Makefile
index 2786b06..b18a3a1 100644
--- a/Makefile
+++ b/Makefile
@@ -41,15 +41,9 @@ install-tools:
 		aarch64) SIGNAL_ARCH=arm64 ;; \
 		*) echo "Unsupported architecture: $$ARCH"; exit 1 ;; \
 	esac; \
-	TMP_DIR=$$(mktemp -d); \
-	cd $$TMP_DIR && \
-	curl -L -o signal-cli.gz \
-		https://media.projektzentrisch.de/temp/signal-cli/signal-cli_ubuntu2004_$${SIGNAL_ARCH}.gz && \
-	gunzip signal-cli.gz && \
-	sudo mv signal-cli /usr/local/bin/signal-cli && \
+	gunzip -c vendor/signal-cli-$${SIGNAL_ARCH}.gz > /tmp/signal-cli && \
+	sudo mv /tmp/signal-cli /usr/local/bin/signal-cli && \
 	sudo chmod +x /usr/local/bin/signal-cli && \
-	cd - && \
-	rm -rf $$TMP_DIR && \
 	signal-cli --version && \
 	echo "signal-cli installed successfully to /usr/local/bin/signal-cli"
 
diff --git a/vendor/signal-cli-amd64.gz b/vendor/signal-cli-amd64.gz
new file mode 100644
index 0000000..8831cf8
Binary files /dev/null and b/vendor/signal-cli-amd64.gz differ
diff --git a/vendor/signal-cli-arm64.gz b/vendor/signal-cli-arm64.gz
new file mode 100644
index 0000000..750d24a
Binary files /dev/null and b/vendor/signal-cli-arm64.gz differ