diff --git a/swh/loader/package/golang/loader.py b/swh/loader/package/golang/loader.py
--- a/swh/loader/package/golang/loader.py
+++ b/swh/loader/package/golang/loader.py
@@ -11,7 +11,7 @@
 import attr
 
 from swh.loader.package.loader import BasePackageInfo, PackageLoader
-from swh.loader.package.utils import EMPTY_AUTHOR, api_info, release_name
+from swh.loader.package.utils import EMPTY_AUTHOR, api_info, cached_method, release_name
 from swh.model.model import ObjectType, Release, Sha1Git, TimestampWithTimezone
 from swh.storage.interface import StorageInterface
 
@@ -54,8 +54,15 @@
         self.url = _uppercase_encode(self.url)
 
     def get_versions(self) -> Sequence[str]:
-        return api_info(f"{self.url}/@v/list").decode().splitlines()
-
+        versions = api_info(f"{self.url}/@v/list").decode().splitlines()
+        # some go packages only have a development version not listed by the endpoint above,
+        # so ensure to return it or it will be missed by the golang loader
+        default_version = self.get_default_version()
+        if default_version not in versions:
+            versions.append(default_version)
+        return versions
+
+    @cached_method
     def get_default_version(self) -> str:
         latest = api_info(f"{self.url}/@latest")
         return json.loads(latest)["Version"]
diff --git a/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@latest b/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@latest
new file mode 100644
--- /dev/null
+++ b/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@latest
@@ -0,0 +1 @@
+{"Version":"v0.0.0-20131225113241-85981e2038bf","Time":"2013-12-25T11:32:41Z"}
\ No newline at end of file
diff --git a/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_list b/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_list
new file mode 100644
diff --git a/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_v0.0.0-20131225113241-85981e2038bf.info b/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_v0.0.0-20131225113241-85981e2038bf.info
new file mode 100644
--- /dev/null
+++ b/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_v0.0.0-20131225113241-85981e2038bf.info
@@ -0,0 +1 @@
+{"Version":"v0.0.0-20131225113241-85981e2038bf","Time":"2013-12-25T11:32:41Z"}
\ No newline at end of file
diff --git a/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_v0.0.0-20131225113241-85981e2038bf.zip b/swh/loader/package/golang/tests/data/https_proxy.golang.org/github.com_xgdapg_daemon_@v_v0.0.0-20131225113241-85981e2038bf.zip
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001

diff --git a/swh/loader/package/golang/tests/test_golang.py b/swh/loader/package/golang/tests/test_golang.py
--- a/swh/loader/package/golang/tests/test_golang.py
+++ b/swh/loader/package/golang/tests/test_golang.py
@@ -20,3 +20,12 @@
     loader = GolangLoader(swh_storage, url)
 
     assert loader.load()["status"] == "eventful"
+
+
+def test_golang_loader_package_with_dev_version_only(
+    swh_storage, requests_mock_datadir
+):
+    url = "https://pkg.go.dev/github.com/xgdapg/daemon"
+    loader = GolangLoader(swh_storage, url)
+
+    assert loader.load()["status"] == "eventful"