diff --git a/requirements/conda.txt b/requirements/conda.txt
index 4278ea1..9cc306b 100644
--- a/requirements/conda.txt
+++ b/requirements/conda.txt
@@ -1,2 +1 @@
 diffpy.structure
-numpy
diff --git a/requirements/pip.txt b/requirements/pip.txt
index 4278ea1..9cc306b 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -1,2 +1 @@
 diffpy.structure
-numpy