diff --git a/pulsar-functions/runtime/src/main/java/org/apache/pulsar/client/admin/internal/FunctionsImpl.java b/pulsar-functions/runtime/src/main/java/org/apache/pulsar/client/admin/internal/FunctionsImpl.java
index 733957be33dba..eadbd3f757ea3 100644
--- a/pulsar-functions/runtime/src/main/java/org/apache/pulsar/client/admin/internal/FunctionsImpl.java
+++ b/pulsar-functions/runtime/src/main/java/org/apache/pulsar/client/admin/internal/FunctionsImpl.java
@@ -120,7 +120,7 @@ public void updateFunction(FunctionConfig functionConfig, byte[] code) throws Pu
                         MediaType.APPLICATION_JSON_TYPE));
             }
             request(functions.path(functionConfig.getTenant()).path(functionConfig.getNameSpace()).path(functionConfig.getName()))
-                    .post(Entity.entity(mp, MediaType.MULTIPART_FORM_DATA), ErrorData.class);
+                    .put(Entity.entity(mp, MediaType.MULTIPART_FORM_DATA), ErrorData.class);
         } catch (Exception e) {
             throw getApiException(e);
         }