diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c81ddd69..5867f769 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -53,6 +53,10 @@ jobs:
       env:
         PYTHON_VERSION: ${{ matrix.python_version }}
 
+    - name: Fix PsychXR numpy dependency DLL issues (Windows only)
+      if: matrix.os == 'windows-latest'
+      run: |
+        conda install --force-reinstall numpy
 
     - name: Run eegnb install test
       run: |
diff --git a/environments/eeg-expy-full.yml b/environments/eeg-expy-full.yml
index 5a6fbd66..9e234aab 100644
--- a/environments/eeg-expy-full.yml
+++ b/environments/eeg-expy-full.yml
@@ -5,6 +5,7 @@ dependencies:
     # System-level dependencies
     - python>=3.8,<=3.10 # psychopy <= 3.10
     - dukpy==0.2.3 # psychopy dependency, avoid failing due to building wheel on win 3.9.
+    - numpy # fix PsychXR numpy dependency DLL issues on Windows
     - pytables # install pytables for macOS arm64, so do not need to build from source.
     - rust # used by docsbuild
     - liblsl # install liblsl to prevent error on macOS and Ubuntu: "RuntimeError: LSL binary library file was not found."