diff --git a/docker-compose.example.yml b/docker-compose.example.yml
index 589049f..3c7c2f4 100644
--- a/docker-compose.example.yml
+++ b/docker-compose.example.yml
@@ -14,7 +14,6 @@ services:
             - /tmp
             - /judger_run:exec,mode=777
             - /spj:exec,mode=777
-            - /dev/shm:mode=777
         volumes:
             - $PWD/tests/test_case:/test_case:ro
             - $PWD/log:/log
diff --git a/server/.python-version b/server/.python-version
new file mode 100644
index 0000000..b727628
--- /dev/null
+++ b/server/.python-version
@@ -0,0 +1 @@
+3.6.2
diff --git a/server/compiler.py b/server/compiler.py
index c9b0c4f..b88af56 100644
--- a/server/compiler.py
+++ b/server/compiler.py
@@ -34,7 +34,7 @@ class Compiler(object):
 
         if result["result"] != _judger.RESULT_SUCCESS:
             if os.path.exists(compiler_out):
-                with open(compiler_out) as f:
+                with open(compiler_out, encoding="utf-8") as f:
                     error = f.read().strip()
                     os.remove(compiler_out)
                     if error:
diff --git a/server/judge_client.py b/server/judge_client.py
index 758dc98..1b88dd2 100644
--- a/server/judge_client.py
+++ b/server/judge_client.py
@@ -56,7 +56,7 @@ class JudgeClient(object):
 
     def _compare_output(self, test_case_file_id):
         user_output_file = os.path.join(self._submission_dir, str(test_case_file_id) + ".out")
-        with open(user_output_file, "r") as f:
+        with open(user_output_file, "r", encoding="utf-8") as f:
             content = f.read()
         output_md5 = hashlib.md5(content.rstrip().encode("utf-8")).hexdigest()
         result = output_md5 == self._get_test_case_file_info(test_case_file_id)["stripped_output_md5"]
@@ -141,7 +141,7 @@ class JudgeClient(object):
 
         if self._output:
             try:
-                with open(user_output_file, "r") as f:
+                with open(user_output_file, "r", encoding="utf-8") as f:
                     run_result["output"] = f.read()
             except Exception:
                 pass
diff --git a/server/server.py b/server/server.py
index 3d4a38d..c4fe300 100644
--- a/server/server.py
+++ b/server/server.py
@@ -66,7 +66,7 @@ class JudgeServer:
                 src_path = os.path.join(submission_dir, compile_config["src_name"])
 
                 # write source code into file
-                with open(src_path, "w") as f:
+                with open(src_path, "w", encoding="utf-8") as f:
                     f.write(src)
 
                 # compile source code, return exe file path
@@ -75,7 +75,7 @@ class JudgeServer:
                                               output_dir=submission_dir)
             else:
                 exe_path = os.path.join(submission_dir, run_config["exe_name"])
-                with open(exe_path, "w") as f:
+                with open(exe_path, "w", encoding="utf-8") as f:
                     f.write(src)
 
             judge_client = JudgeClient(run_config=language_config["run"],
@@ -100,7 +100,7 @@ class JudgeServer:
 
         # if spj source code not found, then write it into file
         if not os.path.exists(spj_src_path):
-            with open(spj_src_path, "w") as f:
+            with open(spj_src_path, "w", encoding="utf-8") as f:
                 f.write(src)
         try:
             Compiler().compile(compile_config=spj_compile_config,
diff --git a/tests/test_case/unicode/1.in b/tests/test_case/unicode/1.in
new file mode 100644
index 0000000..98882f7
--- /dev/null
+++ b/tests/test_case/unicode/1.in
@@ -0,0 +1 @@
+你好，世界
diff --git a/tests/test_case/unicode/1.out b/tests/test_case/unicode/1.out
new file mode 100644
index 0000000..98882f7
--- /dev/null
+++ b/tests/test_case/unicode/1.out
@@ -0,0 +1 @@
+你好，世界
diff --git a/tests/test_case/unicode/info b/tests/test_case/unicode/info
new file mode 100644
index 0000000..cdee612
--- /dev/null
+++ b/tests/test_case/unicode/info
@@ -0,0 +1,12 @@
+{
+    "spj": false,
+    "test_cases": {
+        "1": {
+            "stripped_output_md5": "dbefd3ada018615b35588a01e216ae6e",
+            "input_size": 16,
+            "output_size": 16,
+            "input_name": "1.in",
+            "output_name": "1.out"
+        }
+    }
+}
\ No newline at end of file