diff --git a/.vscode/settings.json b/.vscode/settings.json
index f8be830..3eb0f58 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -2,6 +2,7 @@
     "peacock.color": "#81ec64",
     "workbench.colorCustomizations": {
         "activityBar.background": "#a6f291",
+        "activityBar.activeBackground": "#a6f291",
         "activityBar.activeBorder": "#708cee",
         "activityBar.foreground": "#15202b",
         "activityBar.inactiveForeground": "#15202b99",
diff --git a/bel/edge/pipeline.py b/bel/edge/pipeline.py
index 4a18e7c..126b9f1 100755
--- a/bel/edge/pipeline.py
+++ b/bel/edge/pipeline.py
@@ -71,7 +71,7 @@ def process_nanopub(
     if token:
         headers = {"Authorization": f"Bearer {token}"}
 
-    r = http_client.get(nanopub_url, headers=headers, verify=False)
+    r = http_client.get(nanopub_url, headers=headers)
 
     nanopub = r.json()
 
@@ -253,7 +253,7 @@ def edge_iterator(edges=[], edges_fn=None):
             "annotations",
             "edge_types",
         ]
-        for key in relation_hash:
+        for key in list(relation_hash.keys()):
             if key not in keep:
                 relation_hash.pop(key, None)
 
diff --git a/bel/utils.py b/bel/utils.py
index 1e212a9..7e64671 100644
--- a/bel/utils.py
+++ b/bel/utils.py
@@ -40,14 +40,15 @@ def timespan(start_time):
 def download_file(url):
     """Download file"""
 
-    response = http_client.get(url, stream=True)
-    fp = tempfile.NamedTemporaryFile()
-    for chunk in response.iter_content(chunk_size=1024):
-        if chunk:  # filter out keep-alive new chunks
-            fp.write(chunk)
-
-    # log.info(f'Download file - tmp file: {fp.name}  size: {fp.tell()}')
-    return fp
+    with http_client.stream("GET", url) as response:
+
+        fp = tempfile.NamedTemporaryFile()
+        for chunk in response.iter_bytes():
+            if chunk:  # filter out keep-alive new chunks
+                fp.write(chunk)
+
+        # log.info(f'Download file - tmp file: {fp.name}  size: {fp.tell()}')
+        return fp
 
 
 def url_path_param_quoting(param):