diff --git a/chembl_downloading.py b/chembl_downloading.py
index 6851eb7..35d6930 100644
--- a/chembl_downloading.py
+++ b/chembl_downloading.py
@@ -71,10 +71,10 @@ async def fetch_activities_async(self, session: aiohttp.ClientSession, target_id
         
         base_url = "https://www.ebi.ac.uk/chembl/api/data/activity.json"
         params = {
-            'target_id__in': ','.join(target_ids),
+            'target_chembl_id__in': ','.join(target_ids),
             'assay_type__in': ','.join(assay_types),
             'pchembl_value__isnull': 'false',
-            'only': 'molecule_chembl_id,pchembl_value,target_id,bao_label'
+            'only': 'molecule_chembl_id,pchembl_value,target_chembl_id,bao_label'
         }
         
         # First request to get total count and setup pagination
@@ -208,7 +208,7 @@ async def fetch_all_protein_targets_async(self) -> List[str]:
         base_url = "https://www.ebi.ac.uk/chembl/api/data/target.json"
         params = {
             'target_type': 'SINGLE PROTEIN',
-            'only': 'target_id'
+            'only': 'target_chembl_id'
         }
         
         async with await self.create_session() as session:
@@ -377,4 +377,4 @@ def download_target(args):
 
     args = parser.parse_args()
 
-    download_target(args)
\ No newline at end of file
+    download_target(args)
diff --git a/data_processing.py b/data_processing.py
index e288957..ffda517 100644
--- a/data_processing.py
+++ b/data_processing.py
@@ -451,7 +451,7 @@ def get_chembl_from_uniprot(uniprot_id: str) -> list:
     r = requests.get(url)
     r.raise_for_status()
     data = r.json().get('targets', [])
-    return [t['target_id'] for t in data]
+    return [t['target_chembl_id'] for t in data]
 
 # 6) Fetch inactive compounds for a ChEMBL target
 
@@ -459,7 +459,7 @@ def fetch_inactive_compounds(chembl_target_id, pchembl_threshold) -> list:
     print("fetch_inactive_compounds started")
     url = "https://www.ebi.ac.uk/chembl/api/data/activity.json"
     params = {
-        'target_id': chembl_target_id,
+        'target_chembl_id': chembl_target_id,
         'pchembl_value__lt': pchembl_threshold,
         'limit': 10000
     }