diff --git a/charcoal/genbank_genomes.py b/charcoal/genbank_genomes.py
index 00eef4d..663e923 100755
--- a/charcoal/genbank_genomes.py
+++ b/charcoal/genbank_genomes.py
@@ -20,6 +20,8 @@ def url_for_accession(accession):
     number = "/".join([number[p : p + 3] for p in range(0, len(number), 3)])
     url = f"ftp://ftp.ncbi.nlm.nih.gov/genomes/all/{db}/{number}"
 
+    print(f'downloading genome from: {url}')
+
     with urllib.request.urlopen(url) as response:
         all_names = response.read()
 
diff --git a/environment.yml b/environment.yml
index 0b464b1..65ccf79 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,8 +4,8 @@ channels:
     - bioconda
     - defaults
 dependencies:
-    - python>=3.7
-    - snakemake-minimal=6.4.1
+    - python>=3.7,<3.10
+    - snakemake-minimal==6.10.0
     - screed
     - click>=7,<8
     - pip
diff --git a/setup.py b/setup.py
index 1f7a25f..722036d 100644
--- a/setup.py
+++ b/setup.py
@@ -33,5 +33,5 @@
     setup_requires = [ "setuptools>=38.6.0",
                        'setuptools_scm', 'setuptools_scm_git_archive' ],
     use_scm_version = {"write_to": "charcoal/version.py"},
-    install_requires = ['snakemake==6.4.1', 'click>=7,<8']
+    install_requires = ['snakemake==6.10.0', 'click>=7,<8']
 )