diff --git a/src/grocker/builders/op.py b/src/grocker/builders/op.py
index 4a8faa9..d36adf2 100644
--- a/src/grocker/builders/op.py
+++ b/src/grocker/builders/op.py
@@ -93,7 +93,7 @@ def get_manifest_digest(name):
         return None  # Docker HUB API is not documented
 
     registry, repository = registry_repository.split('/', 1)
-    response = requests.head(f'https://{registry}/v2/{repository}/manifests/{tag}')
+    response = requests.head(f'https://{registry}/v2/{repository}/manifests/{tag}', timeout=5)
     response.raise_for_status()
     return response.headers['Docker-Content-Digest']