diff --git a/envs/env-py310.yml b/envs/env-py310.yml
index 25a15df..474b1e2 100644
--- a/envs/env-py310.yml
+++ b/envs/env-py310.yml
@@ -12,6 +12,7 @@ dependencies:
   - distributed >=2023.9.0
   - databroker >=2.0.0b45
   - diffpy.pdffit2
+  - diffpy.pdfgui
   - diffpy.structure
   - event-model>=1.21
   - hdf5-external-filter-plugins
diff --git a/envs/env-py311.yml b/envs/env-py311.yml
index c206df2..ca77b55 100644
--- a/envs/env-py311.yml
+++ b/envs/env-py311.yml
@@ -45,6 +45,7 @@ dependencies:
   - databroker >=2.0.0b45
   - dictdiffer
   - diffpy.pdffit2
+  - diffpy.pdfgui
   - diffpy.structure
   - discorpy
   - distributed
diff --git a/envs/env-py312.yml b/envs/env-py312.yml
index 7411885..8a0aace 100644
--- a/envs/env-py312.yml
+++ b/envs/env-py312.yml
@@ -45,6 +45,7 @@ dependencies:
   - databroker >=2.0.0b45
   - dictdiffer
   - diffpy.pdffit2
+  - diffpy.pdfgui
   - diffpy.structure
   - discorpy
   - distributed