diff --git a/manual/upgrade/upgrade_docker.md b/manual/upgrade/upgrade_docker.md
index 080da075..5562d2bd 100644
--- a/manual/upgrade/upgrade_docker.md
+++ b/manual/upgrade/upgrade_docker.md
@@ -189,7 +189,7 @@ Seafile 13.0 add a new environment `SEAF_SERVER_STORAGE_TYPE` to determine the s
     SEAF_SERVER_STORAGE_TYPE=
     ```
 
-### Step 4) Remove obsolote configurations
+### Step 4) Remove obsolete configurations
 
 Although the configurations in environment (i.e., `.env`) have higher priority than the configurations in config files, we recommend that you remove or modify the cache configuration in the following files to avoid ambiguity: