diff --git a/environment.yml b/environment.yml
index 4f6ccd2..1b118ab 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ channels:
 dependencies:
   - python=3
   - nodejs=12
-  - biopython=1.70=np112py36_1
+  - biopython=1.74
   - bwa=0.7.17=pl5.22.0_2
   - clint=0.5.1=py36_0
   - eigen=3.2=3
@@ -25,7 +25,6 @@ dependencies:
   - iqtree=1.6.12
   - datrie=0.8
   - snakemake-minimal=5.8.1
-  - biopython=1.74
   - minimap2=2.17
   - artic-network::rampart=1.0
   - pip
diff --git a/simulated_reads.tgz b/simulated_reads.tgz
index 3596948..cb33b88 100644
Binary files a/simulated_reads.tgz and b/simulated_reads.tgz differ