diff --git a/environment.yml b/environment.yml
index afddba2ef81dd47d399b156c582c4641a6e28dc3..ae15924597b0494e1e9f6005aa675cac8a64adb6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -5,7 +5,7 @@ channels:
   - defaults
 dependencies:
   - python=2.7.13
-  - pip
+  - pip=18.1
   - conda-forge::scipy=1.0.1
   - conda-forge::numpy=1.9.3
   - conda-forge::r-markdown=0.8
@@ -13,7 +13,7 @@ dependencies:
   - bioconda::pysam=0.14.1
   - cooler=0.8.3
   - bowtie2=2.3.5
-  - samtools=1.9
+  - samtools=1.7
   - multiqc=1.6
   - pip:
     - iced==0.4.2
\ No newline at end of file