diff --git a/conda-env/dev.yml b/conda-env/dev.yml
index fa6025af6..4b980d115 100644
--- a/conda-env/dev.yml
+++ b/conda-env/dev.yml
@@ -9,6 +9,7 @@ dependencies:
   - python=3.9.7
   - pip=21.2.4
   - numpy=1.21.3
+  - cartopy=0.20.1
   - matplotlib=3.4.3
   - cdat_info=8.2.1
   - cdms2=3.1.5
@@ -16,7 +17,6 @@ dependencies:
   - cdutil=8.2.1
   - cdp=1.7.0
   - eofs=1.4.0
-  - proj4=6.1.1
   # Testing
   # ==================
   - pytest=6.2.5