diff --git a/update.ubuntu.sh b/update.ubuntu.sh
index b4c8cc8a0b3b58cf402d0c88f71d2f02d0930c07..0d01331a62da0bdc42271c144466ee58e580e24e 100644
--- a/update.ubuntu.sh
+++ b/update.ubuntu.sh
@@ -101,7 +101,7 @@ else
 			docker_repository="local/misskey:latest";
 		fi
 
-		sudo -u '$misskey_user' XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker build -t $docker_repository "/home/$misskey_user/$misskey_directory";
+		sudo -u "$misskey_user" XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker build -t $docker_repository "/home/$misskey_user/$misskey_directory";
 
 	else
 		if [ $# == 1 ]; then
@@ -110,10 +110,10 @@ else
 			docker_repository="misskey/misskey:latest";
 		fi
 
-		sudo -u '$misskey_user' XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker pull "$docker_repository";
+		sudo -u "$misskey_user" XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker pull "$docker_repository";
 	fi
 
-	docker_container=$(sudo -u '$misskey_user' XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker run -d -p $misskey_port:$misskey_port --add-host=$misskey_localhost:$docker_host_ip -v /home/$misskey_user/$misskey_directory/files:/misskey/files -v "/home/$misskey_user/$misskey_directory/.config/default.yml":/misskey/.config/default.yml:ro --restart unless-stopped -t "$docker_repository");
+	docker_container=$(sudo -u "$misskey_user" XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker run -d -p $misskey_port:$misskey_port --add-host=$misskey_localhost:$docker_host_ip -v /home/$misskey_user/$misskey_directory/files:/misskey/files -v "/home/$misskey_user/$misskey_directory/.config/default.yml":/misskey/.config/default.yml:ro --restart unless-stopped -t "$docker_repository");
 
 	su "$misskey_user" <<-MKEOF
 	set -eu;
@@ -136,6 +136,6 @@ else
 	_EOF
 	MKEOF
 
-	sudo -u '$misskey_user' XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker image rm "$oldid"
+	sudo -u $misskey_user XDG_RUNTIME_DIR=/run/user/$m_uid DOCKER_HOST=unix:///run/user/$m_uid/docker.sock docker image rm "$oldid"
 
 fi