diff --git a/.github/workflows/build-ultraplot.yml b/.github/workflows/build-ultraplot.yml
index 64ced1f3f..7edadc321 100644
--- a/.github/workflows/build-ultraplot.yml
+++ b/.github/workflows/build-ultraplot.yml
@@ -41,6 +41,7 @@ jobs:
         with:
           environment-file: ./environment.yml
           init-shell: bash
+          post-cleanup: none
           create-args: >-
             --verbose
             python=${{ inputs.python-version }}
@@ -70,6 +71,7 @@ jobs:
         with:
           environment-file: ./environment.yml
           init-shell: bash
+          post-cleanup: none
           create-args: >-
             --verbose
             python=${{ inputs.python-version }}