diff --git a/CHANGELOG.md b/CHANGELOG.md
index a2d837b0a..7d165a1bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 **Note**: Numbers like (\#123) point to closed Pull Requests on the fractal-tasks-core repository.
 
+# Unreleased
+
+* Testing:
+    * Fix links to ome/ngff specs (\#930).
+
 # 1.4.3
 
 * Tasks:
diff --git a/tests/tasks/_validation.py b/tests/tasks/_validation.py
index 00ff4028b..3c008bb12 100644
--- a/tests/tasks/_validation.py
+++ b/tests/tasks/_validation.py
@@ -19,11 +19,15 @@
 
 
 def validate_schema(*, path: str, type: str):
-
+    if __OME_NGFF_VERSION__ != "0.4":
+        raise ValueError(
+            "This test is only valid for OME-NGFF version 0.4, "
+            "please update the test."
+        )
     file_path = pooch.retrieve(
         url=(
-            "https://raw.githubusercontent.com/ome/ngff/main/"
-            f"{__OME_NGFF_VERSION__}/schemas/{type}.schema"
+            "https://raw.githubusercontent.com/ome/ngff/"
+            f"7ac3430c74a66e5bcf53e41c429143172d68c0a4/schemas/{type}.schema"
         ),
         known_hash=None,
     )
diff --git a/tests/test_unit_channels.py b/tests/test_unit_channels.py
index 76fe38dcc..92ad69b7f 100644
--- a/tests/test_unit_channels.py
+++ b/tests/test_unit_channels.py
@@ -126,10 +126,16 @@ def test_get_channel_from_list(testdata_path: Path):
 
 @pytest.fixture(scope="session")
 def omero_channel_schema():
+
+    if __OME_NGFF_VERSION__ != "0.4":
+        raise ValueError(
+            "This test is only valid for OME-NGFF version 0.4, "
+            "please update the test."
+        )
     file_path = pooch.retrieve(
         url=(
-            "https://raw.githubusercontent.com/ome/ngff/main/"
-            f"{__OME_NGFF_VERSION__}/schemas/image.schema"
+            "https://raw.githubusercontent.com/ome/ngff/"
+            "7ac3430c74a66e5bcf53e41c429143172d68c0a4/schemas/image.schema"
         ),
         known_hash=None,
     )