diff --git a/CHANGELOG.md b/CHANGELOG.md
index d710ba4..2c4aeb5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 3.1.2 (2025-05-22)
+
+### Fix
+
+- add missing mac signed_artifacts
+
 ## 3.1.1 (2025-05-22)
 
 ### Fix
diff --git a/pyproject.toml b/pyproject.toml
index 61d89e5..2d23368 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mozilla-taskgraph"
-version = "3.1.1"
+version = "3.1.2"
 description = "Mozilla specific transforms and utilities for Taskgraph"
 readme = "README.md"
 authors = [
diff --git a/src/mozilla_taskgraph/util/signed_artifacts.py b/src/mozilla_taskgraph/util/signed_artifacts.py
index b72e9de..09b7b06 100644
--- a/src/mozilla_taskgraph/util/signed_artifacts.py
+++ b/src/mozilla_taskgraph/util/signed_artifacts.py
@@ -10,6 +10,8 @@ def get_signed_artifacts(input, formats, behavior=None):
     artifacts = set()
     if input.endswith(".dmg"):
         artifacts.add(input.replace(".dmg", ".tar.gz"))
+        if behavior and behavior != "mac_sign":
+            artifacts.add(input.replace(".dmg", ".pkg"))
     else:
         artifacts.add(input)
 
diff --git a/test/util/test_signed_artifacts.py b/test/util/test_signed_artifacts.py
new file mode 100644
index 0000000..ab1a9d1
--- /dev/null
+++ b/test/util/test_signed_artifacts.py
@@ -0,0 +1,22 @@
+import pytest
+
+from mozilla_taskgraph.util.signed_artifacts import get_signed_artifacts
+
+
+@pytest.mark.parametrize(
+    "input_file, formats, behavior, expected",
+    [
+        ("example.dmg", [], None, {"example.tar.gz": True, "example.pkg": False}),
+        ("example.dmg", [], "mac_sign", {"example.tar.gz": True, "example.pkg": False}),
+        ("example.dmg", [], "other", {"example.tar.gz": True, "example.pkg": True}),
+        ("example.zip", [], None, {"example.zip": True}),
+        ("example.zip", ["gcp_prod_autograph_gpg"], None, {"example.zip.asc": True}),
+    ],
+)
+def test_get_signed_artifacts(input_file, formats, behavior, expected):
+    result = get_signed_artifacts(input_file, formats, behavior=behavior)
+    for artifact, exists in expected.items():
+        if exists:
+            assert artifact in result
+        else:
+            assert artifact not in result
diff --git a/uv.lock b/uv.lock
index 06db181..64a136b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -567,7 +567,7 @@ wheels = [
 
 [[package]]
 name = "mozilla-taskgraph"
-version = "3.1.1"
+version = "3.1.2"
 source = { editable = "." }
 dependencies = [
     { name = "taskcluster-taskgraph" },