diff --git a/Dockerfile b/Dockerfile
index 5959070..9b81b9c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -37,4 +37,6 @@ RUN chmod +x /root/sandbox.sh
 
 EXPOSE 5050/tcp
 
+ENV JUDGER_VERSION=$(git describe --tags --always --dirty)
+
 ENTRYPOINT [ "/root/entrypoint.sh" ]
diff --git a/sojj/Services/JudgeService.cs b/sojj/Services/JudgeService.cs
index 168f9fd..0014a23 100644
--- a/sojj/Services/JudgeService.cs
+++ b/sojj/Services/JudgeService.cs
@@ -46,7 +46,7 @@ public async Task<bool> CheckinAsync()
         var formdata = new MultipartFormDataContent{
             {new StringContent(Environment.MachineName), "name"},
             {new StringContent(this.configuration.GetValue<int>("NumberOfWorkers", Environment.ProcessorCount).ToString()), "concurrency"},
-            {new StringContent(this.configuration.GetValue<string>("Version", "default")), "version"},
+            {new StringContent(this.configuration.GetValue<string>("JUDGER_VERSION", "default")), "version"},
         };
         var response = await httpClient.PostAsync("/judge/checkin", formdata);
         if (response.IsSuccessStatusCode)