diff --git a/.github/workflows/cypress.yaml b/.github/workflows/cypress.yaml
index d753ec0312..8fd1156900 100644
--- a/.github/workflows/cypress.yaml
+++ b/.github/workflows/cypress.yaml
@@ -134,6 +134,10 @@ jobs:
                   persist-credentials: false
                   path: matrix-react-sdk
 
+            # This is necessary as Cypress relies on eval for passing functions between processes
+            - name: Allow CSP script-src unsafe-eval
+              run: sed -i "s/script-src /script-src 'unsafe-eval' /" ../webapp/index.html
+
             - name: Run Cypress tests
               uses: cypress-io/github-action@59c3b9b4a1a6e623c29806797d849845443487d1
               with: