diff --git a/atlas/atlas.py b/atlas/atlas.py
index 8afc7342..ae674d7f 100644
--- a/atlas/atlas.py
+++ b/atlas/atlas.py
@@ -247,7 +247,7 @@ def run_download(db_dir, jobs, snakemake_args):
     cmd = (
         "snakemake --snakefile {snakefile} download "
         "--jobs {jobs} --rerun-incomplete "
-        "--conda-frontend mamba --scheduler greedy "
+        "--scheduler greedy "
         "--nolock  --use-conda  --conda-prefix {conda_prefix} "
         " --show-failed-logs "
         "--config database_dir='{db_dir}' {add_args} "
diff --git a/atlasenv.yml b/atlasenv.yml
index c1ec80ea..1fc9f561 100644
--- a/atlasenv.yml
+++ b/atlasenv.yml
@@ -4,7 +4,7 @@ channels:
   - defaults
 dependencies:
   - python >=3.8, < 3.12
-  - mamba
+  - mamba=1 #  https://github.com/metagenome-atlas/atlas/issues/742
   - bbmap >= 39.01, <40
   - snakemake-minimal >= 7.18.1, <7.26
   - pygments
diff --git a/test/test_docker.sh b/test/test_docker.sh
new file mode 100644
index 00000000..775881a1
--- /dev/null
+++ b/test/test_docker.sh
@@ -0,0 +1,9 @@
+#! /bin/bash
+
+pip install -e .
+
+atlas --help
+
+cd test
+
+./test_local.sh #--conda-frontend conda
\ No newline at end of file
diff --git a/workflow/envs/fasta.yaml b/workflow/envs/fasta.yaml
index 13fc46c2..7beaf1f7 100644
--- a/workflow/envs/fasta.yaml
+++ b/workflow/envs/fasta.yaml
@@ -3,7 +3,7 @@ channels:
     - bioconda
     - defaults
 dependencies:
-    - pyfastx=0.9
+    - pyfastx=2.1
     - pandas=1.2
     - pyarrow
     - biopython
diff --git a/workflow/envs/required_packages.yaml b/workflow/envs/required_packages.yaml
index 9ec72359..07b3f638 100644
--- a/workflow/envs/required_packages.yaml
+++ b/workflow/envs/required_packages.yaml
@@ -9,4 +9,4 @@ dependencies:
     - bzip2 >=1.0
     - pandas >=1.2, <2
     - samtools >=1.13, <2
-    - sambamba <1
+    - sambamba