diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 925d73d..5bdd3a7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ['3.9', '3.10', '3.11']
-        os: [ubuntu-latest, macOS-latest]
+        os: [ubuntu-latest, macos-13]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/src/daq2lh5/data_decoder.py b/src/daq2lh5/data_decoder.py
index 731a6cb..abbcff4 100644
--- a/src/daq2lh5/data_decoder.py
+++ b/src/daq2lh5/data_decoder.py
@@ -74,7 +74,7 @@ class DataDecoder:
     def __init__(
         self, garbage_length: int = 256, packet_size_guess: int = 1024
     ) -> None:
-        self.garbage_table = lgdo.Table(garbage_length)
+        self.garbage_table = lgdo.Table(size=garbage_length)
         shape_guess = (garbage_length, packet_size_guess)
         self.garbage_table.add_field(
             "packets", lgdo.VectorOfVectors(shape_guess=shape_guess, dtype="uint8")