diff --git a/.github/workflows/build_doc.yml b/.github/workflows/build_doc.yml
index cb039d2..7fc4e09 100644
--- a/.github/workflows/build_doc.yml
+++ b/.github/workflows/build_doc.yml
@@ -24,7 +24,7 @@ jobs:
           use-mamba: true
           
       - name: Cache Conda env
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ env.CONDA }}/envs
           key:
diff --git a/.github/workflows/test_suite.yml b/.github/workflows/test_suite.yml
index 08f04fd..b62e735 100644
--- a/.github/workflows/test_suite.yml
+++ b/.github/workflows/test_suite.yml
@@ -28,7 +28,7 @@ jobs:
           use-mamba: true
           
       - name: Cache Conda env
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ env.CONDA }}/envs
           key:
diff --git a/tests/conda_test_environment.yml b/tests/conda_test_environment.yml
index 7cd3976..c832ae2 100644
--- a/tests/conda_test_environment.yml
+++ b/tests/conda_test_environment.yml
@@ -116,6 +116,7 @@ dependencies:
   - proj=9.0.0=h93bde94_1
   - pthread-stubs=0.4=h36c2ea0_1001
   - python=3.11.3=h2755cc3_0_cpython
+  - ipython=7.29.0=py39hb070fc8_0
   - python_abi=3.11=3_cp311
   - readline=8.2=h8228510_1
   - setuptools=67.7.2=pyhd8ed1ab_0