diff --git a/requirements-conda.txt b/requirements-conda.txt
index 57d0491c..a1fe827b 100644
--- a/requirements-conda.txt
+++ b/requirements-conda.txt
@@ -15,5 +15,6 @@ unzip=6.0
 arrow=0.12.1
 bedtools=2.27.1
 biopython=1.72
+matplotlib=2.2.0
 pysam=0.15.0
 pybedtools=0.7.10