diff --git a/vulnerabilities/importers/alpine_linux.py b/vulnerabilities/importers/alpine_linux.py
index 15d1d1716..350e906f0 100644
--- a/vulnerabilities/importers/alpine_linux.py
+++ b/vulnerabilities/importers/alpine_linux.py
@@ -79,7 +79,7 @@ def fetch_response(url):
     response = requests.get(url)
     if response.status_code == 200:
         return response
-    raise Exception(f"Failed to fetch data from {url!r}")
+    raise Exception(f"Failed to fetch data from {url!r} with status code: {response.status_code!r}")
 
 
 def fetch_advisory_directory_links(page_response_content: str) -> List[str]:
@@ -87,7 +87,11 @@ def fetch_advisory_directory_links(page_response_content: str) -> List[str]:
     Return a list of advisory directory links present in `page_response_content` html string
     """
     index_page = BeautifulSoup(page_response_content, features="lxml")
-    alpine_versions = [link.text for link in index_page.find_all("a") if link.text.startswith("v")]
+    alpine_versions = [
+        link.text
+        for link in index_page.find_all("a")
+        if link.text.startswith("v") or link.text.startswith("edge")
+    ]
 
     if not alpine_versions:
         LOGGER.error(f"No versions found in {BASE_URL!r}")
diff --git a/vulnerabilities/improver.py b/vulnerabilities/improver.py
index 60f293efd..27e6a26cd 100644
--- a/vulnerabilities/improver.py
+++ b/vulnerabilities/improver.py
@@ -27,10 +27,10 @@ class Inference:
     """
 
     vulnerability_id: str = None
-    aliases: Optional[List[str]] = None
+    aliases: Optional[List[str]] = dataclasses.field(default_factory=list)
     confidence: int = MAX_CONFIDENCE
     summary: Optional[str] = None
-    affected_purls: Optional[List[PackageURL]] = None
+    affected_purls: Optional[List[PackageURL]] = dataclasses.field(default_factory=list)
     fixed_purl: PackageURL = None
     references: List[Reference] = dataclasses.field(default_factory=list)
 
@@ -50,9 +50,9 @@ def __post_init__(self):
         versionless_purls = []
         purls = []
         if self.fixed_purl:
-            purls = [self.fixed_purl]
+            purls.append(self.fixed_purl)
         if self.affected_purls:
-            purls = purls + self.affected_purls
+            purls.extend(self.affected_purls)
         for purl in purls:
             if purl and not purl.version:
                 versionless_purls.append(purl)
diff --git a/vulnerabilities/tests/test_alpine.py b/vulnerabilities/tests/test_alpine.py
index 5a2876557..3f1f5f950 100644
--- a/vulnerabilities/tests/test_alpine.py
+++ b/vulnerabilities/tests/test_alpine.py
@@ -465,6 +465,7 @@ def test_process_record(caplog):
 
 def test_fetch_advisory_directory_links():
     expected = [
+        "https://secdb.alpinelinux.org/edge/",
         "https://secdb.alpinelinux.org/v3.10/",
         "https://secdb.alpinelinux.org/v3.11/",
         "https://secdb.alpinelinux.org/v3.12/",