diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e9a2bec4..0bac0874 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -59,7 +59,7 @@ jobs:
         uses: conda-incubator/setup-miniconda@v3
         with:
           python-version: 3.9
-          mamba-version: "*"
+          mamba-version: 1.5.10
           channels: conda-forge,defaults
           channel-priority: true
           activate-environment: conda-env
diff --git a/q2_moshpit/kraken2/tests/test_bracken.py b/q2_moshpit/kraken2/tests/test_bracken.py
index f68eb39f..6cdc0910 100644
--- a/q2_moshpit/kraken2/tests/test_bracken.py
+++ b/q2_moshpit/kraken2/tests/test_bracken.py
@@ -72,7 +72,7 @@ def test_run_bracken_one_sample(self, p1):
         )
 
         kraken2_report_fp = self.get_data_path(
-            'kraken2-report/sample1/sample1.report.txt'
+            'kraken2-reports-select/samples/sample1.report.txt'
         )
         bracken_report_dir = self.get_data_path('bracken-report')
         obs_table = _run_bracken_one_sample(
@@ -113,15 +113,13 @@ def test_run_bracken_one_sample(self, p1):
         side_effect=CalledProcessError(returncode=123, cmd='bracken')
     )
     def test_run_bracken_one_sample_error(self, p1):
-        kraken2_report_fp = self.get_data_path(
-            'kraken2-report/sample1/sample1.report.txt'
-        )
+        kraken2_report_fp = tempfile.NamedTemporaryFile()
         bracken_report_dir = self.get_data_path('bracken-report')
 
         with self.assertRaisesRegex(Exception, 'return code 123'):
             _run_bracken_one_sample(
                 bracken_db=self.bracken_db_dir,
-                kraken2_report_fp=kraken2_report_fp,
+                kraken2_report_fp=kraken2_report_fp.name,
                 bracken_report_dir=bracken_report_dir,
                 tmp_dir=self.temp_dir,
                 threshold=self.kwargs['threshold'],
diff --git a/q2_moshpit/kraken2/tests/test_database.py b/q2_moshpit/kraken2/tests/test_database.py
index c20cb16f..2b6af495 100644
--- a/q2_moshpit/kraken2/tests/test_database.py
+++ b/q2_moshpit/kraken2/tests/test_database.py
@@ -203,7 +203,9 @@ def test_fetch_libraries_exception(self, p1):
 
     @patch('q2_moshpit.kraken2.database.run_command')
     def test_add_seqs_to_library(self, p1):
-        seqs = DNAFASTAFormat(self.get_data_path('mags/samp1/bin1.fa'), 'r')
+        seqs = DNAFASTAFormat(self.get_data_path(
+            'mags/sample1/3b72d1a7-ddb0-4dc7-ac36-080ceda04aaa.fasta'), 'r'
+        )
 
         _add_seqs_to_library(self.kraken2_db_dir, seqs=seqs, no_masking=True)
 
@@ -218,7 +220,9 @@ def test_add_seqs_to_library(self, p1):
         side_effect=CalledProcessError(123, 'cmd')
     )
     def test_add_seqs_to_library_exception(self, p1):
-        seqs = DNAFASTAFormat(self.get_data_path('mags/samp1/bin1.fa'), 'r')
+        seqs = DNAFASTAFormat(self.get_data_path(
+            'mags/sample1/3b72d1a7-ddb0-4dc7-ac36-080ceda04aaa.fasta'), 'r'
+        )
 
         with self.assertRaisesRegex(
                 Exception,