diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 8c333c82..5de4ea19 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -76,7 +76,7 @@
            --timeout 60
 
        - name: run docstring tests
-         if: contains(matrix.environment-file, 'ci/310-oldest.yaml')
+         if: contains(matrix.environment-file, 'latest') || contains(matrix.environment-file, 'dev')
          run: |
            pytest \
            -v \
diff --git a/ci/310-latest.yaml b/ci/310-latest.yaml
index 8b54d28d..a4cf8dbb 100644
--- a/ci/310-latest.yaml
+++ b/ci/310-latest.yaml
@@ -18,5 +18,6 @@ dependencies:
   - codecov
   - pytest
   - pytest-cov
+  - pytest-doctestplus
   - pytest-timeout
   - pytest-xdist
diff --git a/ci/310-oldest.yaml b/ci/310-oldest.yaml
index 95aae3c0..78b8ceae 100644
--- a/ci/310-oldest.yaml
+++ b/ci/310-oldest.yaml
@@ -19,4 +19,3 @@ dependencies:
   - pytest-cov
   - pytest-timeout
   - pytest-xdist
-  - pytest-doctestplus
diff --git a/ci/311-latest.yaml b/ci/311-latest.yaml
index 1009c2cd..a5905322 100644
--- a/ci/311-latest.yaml
+++ b/ci/311-latest.yaml
@@ -18,5 +18,6 @@ dependencies:
   - codecov
   - pytest
   - pytest-cov
+  - pytest-doctestplus
   - pytest-timeout
   - pytest-xdist
diff --git a/ci/312-dev.yaml b/ci/312-dev.yaml
index bc08110e..d32b0418 100644
--- a/ci/312-dev.yaml
+++ b/ci/312-dev.yaml
@@ -14,6 +14,7 @@ dependencies:
   - codecov
   - pytest
   - pytest-cov
+  - pytest-doctestplus
   - pytest-timeout
   - pytest-xdist
   - pip:
diff --git a/ci/312-latest.yaml b/ci/312-latest.yaml
index f2dbf802..b862aaf2 100644
--- a/ci/312-latest.yaml
+++ b/ci/312-latest.yaml
@@ -18,6 +18,7 @@ dependencies:
   - codecov
   - pytest
   - pytest-cov
+  - pytest-doctestplus
   - pytest-timeout
   - pytest-xdist
   # for docs build action (this env only)