diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee604d8..3530133 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -105,13 +105,13 @@ jobs:
               "http 127.0.0.1 18080" > ci.e2e.conf
 
             cargo run -p proxychains-bin -- -f ./ci.e2e.conf --probe --probe-json > probe-report.json || true
-            python3 -c "import json; r=json.load(open('probe-report.json','r',encoding='utf-8')); assert 'summary' in r; assert int(r['summary']['fail']) == 0"
+            python3 -c "import json; r=json.load(open(\"probe-report.json\",\"r\",encoding=\"utf-8\")); assert \"summary\" in r; assert int(r[\"summary\"][\"fail\"]) == 0"
 
-            DNS_V4="$(cargo run -q -p proxychains-bin -- -q -f ./ci.e2e.conf python3 -c "import socket;print(socket.getaddrinfo(\"dns-proxychains-e2e.invalid\",443,0,socket.SOCK_STREAM)[0][4][0])" | tr -d "\r\n")"
+            DNS_V4=$(cargo run -q -p proxychains-bin -- -q -f ./ci.e2e.conf python3 -c "import socket;print(socket.getaddrinfo(\"dns-proxychains-e2e.invalid\",443,0,socket.SOCK_STREAM)[0][4][0])" | tr -d "\r\n")
             echo "dns v4 fake ip: ${DNS_V4}"
             DNS_V4="${DNS_V4}" python3 -c "import ipaddress, os; n = ipaddress.ip_network(\"224.0.0.0/8\"); ip = ipaddress.ip_address(os.environ[\"DNS_V4\"]); mapped = getattr(ip, \"ipv4_mapped\", None); ok = (ip.version == 4 and ip in n) or (ip.version == 6 and mapped is not None and mapped in n); assert ok"
 
-            DNS_V6="$(cargo run -q -p proxychains-bin -- -q -f ./ci.e2e.conf python3 -c "import socket;print(socket.getaddrinfo(\"dns-proxychains-e2e.invalid\",443,socket.AF_INET6,socket.SOCK_STREAM)[0][4][0])" | tr -d "\r\n")"
+            DNS_V6=$(cargo run -q -p proxychains-bin -- -q -f ./ci.e2e.conf python3 -c "import socket;print(socket.getaddrinfo(\"dns-proxychains-e2e.invalid\",443,socket.AF_INET6,socket.SOCK_STREAM)[0][4][0])" | tr -d "\r\n")
             echo "dns v6 fake ip: ${DNS_V6}"
             DNS_V6="${DNS_V6}" python3 -c "import ipaddress, os; n = ipaddress.ip_network(\"224.0.0.0/8\"); lo_min = int(ipaddress.ip_address(\"224.0.0.0\")); lo_max = int(ipaddress.ip_address(\"239.255.255.255\")); ip = ipaddress.ip_address(os.environ[\"DNS_V6\"]); mapped = getattr(ip, \"ipv4_mapped\", None); v4compat = ip.version == 6 and (int(ip) >> 32) == 0 and lo_min <= (int(ip) & 0xffffffff) <= lo_max; v4mapped = ip.version == 6 and mapped is not None and mapped in n; assert v4compat or v4mapped"