diff --git a/doc/environment.yml b/doc/environment.yml
index 956396d040..db0249b5d0 100644
--- a/doc/environment.yml
+++ b/doc/environment.yml
@@ -41,4 +41,4 @@ dependencies:
       - pooch
       - versioneer
       - ablog
-      - e ..
+      - -e ..
diff --git a/requirements.txt b/requirements.txt
index b5c0f5aa60..c1fe381533 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,3 +11,4 @@ xradar>=0.5.0
 pandas
 mda-xdrlib
 xarray!=0.21.0
+pint