diff --git a/deltae b/deltae
index 0b7a4b32..78aae2fd 100755
--- a/deltae
+++ b/deltae
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 # Requires:
 #   python3-scipy >= 1.1.0
diff --git a/run.sh b/run.sh
index d3470603..f7c5fc4f 100755
--- a/run.sh
+++ b/run.sh
@@ -20,6 +20,14 @@
 
 CDPATH=
 
+[ -f .venv/bin/activate ] || {
+  python3 -m venv .venv
+  source .venv/bin/activate
+  pip install numpy colour colour-science packaging matplotlib
+  deactivate
+}
+source .venv/bin/activate
+
 # If DARKTABLE_CLI not set and darktable-cli not found in the PATH but found
 # in standard installation /opt/darktable, use it.
 if [[ -z $DARKTABLE_CLI ]] &&