diff --git a/requirements.txt b/requirements.txt
index 1b6c48a..379bd21 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,3 +9,4 @@ Pillow==8.4.0
 scikit-image==0.18.3
 h5py==3.1.0
 PyQt5==5.15.4
+numexpr==2.7.3
diff --git a/requirements_3.6.txt b/requirements_3.6.txt
index d4a7650..f1c7201 100644
--- a/requirements_3.6.txt
+++ b/requirements_3.6.txt
@@ -9,3 +9,4 @@ Pillow==8.4.0
 scikit-image==0.17.2
 h5py==3.1.0
 PyQt5==5.15.4
+numexpr==2.7.3
diff --git a/requirements_3.9.txt b/requirements_3.9.txt
index 0e5beb3..b356b27 100644
--- a/requirements_3.9.txt
+++ b/requirements_3.9.txt
@@ -9,3 +9,4 @@ Pillow==8.4.0
 scikit-image==0.18.3
 h5py==3.1.0
 PyQt5==5.15.4
+numexpr==2.7.3