diff --git a/.github/workflows/push_tests.yml b/.github/workflows/push_tests.yml
index 20a77be5..14b8ec25 100644
--- a/.github/workflows/push_tests.yml
+++ b/.github/workflows/push_tests.yml
@@ -69,10 +69,21 @@ jobs:
       - name: Install dependencies
         run: make pydist install-dist dev-env-server
       - name: Unit tests
-        run: |
-          make unit-test-server unit-test-client
-          bash <(curl -s https://codecov.io/bash) -y .codecov.yml -k server -cF server,python,unitTest
-          cd client && ./node_modules/codecov/bin/codecov --yml=../.codecov.yml --root=../ --gcov-root=../ -C -F frontend,javascript,unitTest
+        run: make unit-test-server unit-test-client
+      - name: Generate server coverage XML
+        run: coverage xml -o server/coverage.xml
+      - name: Upload server coverage
+        uses: codecov/codecov-action@v5
+        with:
+          flags: server,python,unitTest
+          files: ./server/coverage.xml
+          fail_ci_if_error: false
+      - name: Upload client coverage
+        uses: codecov/codecov-action@v5
+        with:
+          flags: frontend,javascript,unitTest
+          files: ./client/coverage/lcov.info
+          fail_ci_if_error: false
 
   smoke-tests:
     runs-on: macos-latest
@@ -102,9 +113,7 @@ jobs:
           pip install setuptools
           make pydist install-dist
       - name: Smoke tests (without annotations feature)
-        run: |
-          cd client && make smoke-test
-          ./node_modules/codecov/bin/codecov --yml=../.codecov.yml --root=../ --gcov-root=../ -C -F frontend,javascript,smokeTest
+        run: cd client && make smoke-test
 
   # TODO: reinstate: https://github.com/chanzuckerberg/cellxgene/issues/2544
   # smoke-tests-annotations:
diff --git a/client/package-lock.json b/client/package-lock.json
index 8e78889d..1937f9b5 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -71,7 +71,6 @@
         "cheerio": "^1.0.0-rc.6",
         "clean-css": "^5.1.2",
         "clean-webpack-plugin": "^4.0.0-alpha.0",
-        "codecov": "^3.7.1",
         "css-loader": "^5.2.4",
         "css-minimizer-webpack-plugin": "^4.0.0",
         "eslint": "^7.24.0",
@@ -5371,16 +5370,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "node_modules/argv": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
-      "integrity": "sha512-dEamhpPEwRUBpLNHeuCm/v+g0anFByHahxodVO/BbAarHVBBg2MccCwf9K+o1Pof+2btdnkJelYVUWjW/VrATw==",
-      "deprecated": "Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.",
-      "dev": true,
-      "engines": {
-        "node": ">=0.6.10"
-      }
-    },
     "node_modules/aria-query": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-4.2.2.tgz",
@@ -6448,26 +6437,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/codecov": {
-      "version": "3.8.3",
-      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.8.3.tgz",
-      "integrity": "sha512-Y8Hw+V3HgR7V71xWH2vQ9lyS358CbGCldWlJFR0JirqoGtOoas3R3/OclRTvgUYFK29mmJICDPauVKmpqbwhOA==",
-      "deprecated": "https://about.codecov.io/blog/codecov-uploader-deprecation-plan/",
-      "dev": true,
-      "dependencies": {
-        "argv": "0.0.2",
-        "ignore-walk": "3.0.4",
-        "js-yaml": "3.14.1",
-        "teeny-request": "7.1.1",
-        "urlgrey": "1.0.0"
-      },
-      "bin": {
-        "codecov": "bin/codecov"
-      },
-      "engines": {
-        "node": ">=4.0"
-      }
-    },
     "node_modules/collect-v8-coverage": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/collect-v8-coverage/-/collect-v8-coverage-1.0.1.tgz",
@@ -9173,21 +9142,6 @@
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
       "integrity": "sha512-DCXu6Ifhqcks7TZKY3Hxp3y6qphY5SJZmrWMDrKcERSOXWQdMhU9Ig/PYrzyw/ul9jOIyh0N4M0tbC5hodg8dw=="
     },
-    "node_modules/fast-url-parser": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/fast-url-parser/-/fast-url-parser-1.1.3.tgz",
-      "integrity": "sha512-5jOCVXADYNuRkKFzNJ0dCCewsZiYo0dz8QNYljkOpFC6r2U4OBmKtvm/Tsuh4w1YYdDqDb31a8TVhBJ2OJKdqQ==",
-      "dev": true,
-      "dependencies": {
-        "punycode": "^1.3.2"
-      }
-    },
-    "node_modules/fast-url-parser/node_modules/punycode": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-      "integrity": "sha512-jmYNElW7yvO7TV33CjSmvSiE2yco3bV2czu/OzDKdMNVZQWfxCblURLhf+47syQRBntjfLdd/H0egrzIG+oaFQ==",
-      "dev": true
-    },
     "node_modules/fastest-levenshtein": {
       "version": "1.0.12",
       "resolved": "https://registry.npmjs.org/fastest-levenshtein/-/fastest-levenshtein-1.0.12.tgz",
@@ -10251,15 +10205,6 @@
         "node": ">= 4"
       }
     },
-    "node_modules/ignore-walk": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.4.tgz",
-      "integrity": "sha512-PY6Ii8o1jMRA1z4F2hRkH/xN59ox43DavKvD3oDpfurRlOJyAHpifIwpbdv1n4jt4ov0jSpw3kQ4GhJnpBL6WQ==",
-      "dev": true,
-      "dependencies": {
-        "minimatch": "^3.0.4"
-      }
-    },
     "node_modules/import-fresh": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
@@ -16921,15 +16866,6 @@
         "node": ">= 0.8"
       }
     },
-    "node_modules/stream-events": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
-      "integrity": "sha512-E1GUzBSgvct8Jsb3v2X15pjzN1tYebtbLaMg+eBOUOAxgbLoSbT2NS91ckc5lJD1KfLjId+jXJRgo0qnV5Nerg==",
-      "dev": true,
-      "dependencies": {
-        "stubs": "^3.0.0"
-      }
-    },
     "node_modules/string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -17089,12 +17025,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/stubs": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
-      "integrity": "sha512-PdHt7hHUJKxvTCgbKX9C1V/ftOcjJQgz8BZwNfV5c4B6dcGqlpelTbJ999jBGZ2jYiPAwcX5dP6oBwVlBlUbxw==",
-      "dev": true
-    },
     "node_modules/stylehacks": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/stylehacks/-/stylehacks-5.1.0.tgz",
@@ -17353,22 +17283,6 @@
         "node": ">= 6"
       }
     },
-    "node_modules/teeny-request": {
-      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-7.1.1.tgz",
-      "integrity": "sha512-iwY6rkW5DDGq8hE2YgNQlKbptYpY5Nn2xecjQiNjOXWbKzPGUfmeUBCSQbbr306d7Z7U2N0TPl+/SwYRfua1Dg==",
-      "dev": true,
-      "dependencies": {
-        "http-proxy-agent": "^4.0.0",
-        "https-proxy-agent": "^5.0.0",
-        "node-fetch": "^2.6.1",
-        "stream-events": "^1.0.5",
-        "uuid": "^8.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/terminal-link": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
@@ -17957,15 +17871,6 @@
         "requires-port": "^1.0.0"
       }
     },
-    "node_modules/urlgrey": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-1.0.0.tgz",
-      "integrity": "sha512-hJfIzMPJmI9IlLkby8QrsCykQ+SXDeO2W5Q9QTW3QpqZVTx4a/K7p8/5q+/isD8vsbVaFgql/gvAoQCRQ2Cb5w==",
-      "dev": true,
-      "dependencies": {
-        "fast-url-parser": "^1.1.3"
-      }
-    },
     "node_modules/use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -17996,15 +17901,6 @@
         "node": ">= 0.4.0"
       }
     },
-    "node_modules/uuid": {
-      "version": "8.3.2",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
-      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
-      "dev": true,
-      "bin": {
-        "uuid": "dist/bin/uuid"
-      }
-    },
     "node_modules/v8-compile-cache": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
@@ -22694,12 +22590,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "argv": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
-      "integrity": "sha512-dEamhpPEwRUBpLNHeuCm/v+g0anFByHahxodVO/BbAarHVBBg2MccCwf9K+o1Pof+2btdnkJelYVUWjW/VrATw==",
-      "dev": true
-    },
     "aria-query": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-4.2.2.tgz",
@@ -23489,19 +23379,6 @@
       "integrity": "sha512-RpAVKQA5T63xEj6/giIbUEtZwJ4UFIc3ZtvEkiaUERylqe8xb5IvqcgOurZLahv93CLKfxcw5YI+DZcUBRyLXA==",
       "dev": true
     },
-    "codecov": {
-      "version": "3.8.3",
-      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.8.3.tgz",
-      "integrity": "sha512-Y8Hw+V3HgR7V71xWH2vQ9lyS358CbGCldWlJFR0JirqoGtOoas3R3/OclRTvgUYFK29mmJICDPauVKmpqbwhOA==",
-      "dev": true,
-      "requires": {
-        "argv": "0.0.2",
-        "ignore-walk": "3.0.4",
-        "js-yaml": "3.14.1",
-        "teeny-request": "7.1.1",
-        "urlgrey": "1.0.0"
-      }
-    },
     "collect-v8-coverage": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/collect-v8-coverage/-/collect-v8-coverage-1.0.1.tgz",
@@ -25575,23 +25452,6 @@
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
       "integrity": "sha512-DCXu6Ifhqcks7TZKY3Hxp3y6qphY5SJZmrWMDrKcERSOXWQdMhU9Ig/PYrzyw/ul9jOIyh0N4M0tbC5hodg8dw=="
     },
-    "fast-url-parser": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/fast-url-parser/-/fast-url-parser-1.1.3.tgz",
-      "integrity": "sha512-5jOCVXADYNuRkKFzNJ0dCCewsZiYo0dz8QNYljkOpFC6r2U4OBmKtvm/Tsuh4w1YYdDqDb31a8TVhBJ2OJKdqQ==",
-      "dev": true,
-      "requires": {
-        "punycode": "^1.3.2"
-      },
-      "dependencies": {
-        "punycode": {
-          "version": "1.4.1",
-          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-          "integrity": "sha512-jmYNElW7yvO7TV33CjSmvSiE2yco3bV2czu/OzDKdMNVZQWfxCblURLhf+47syQRBntjfLdd/H0egrzIG+oaFQ==",
-          "dev": true
-        }
-      }
-    },
     "fastest-levenshtein": {
       "version": "1.0.12",
       "resolved": "https://registry.npmjs.org/fastest-levenshtein/-/fastest-levenshtein-1.0.12.tgz",
@@ -26382,15 +26242,6 @@
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
       "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg=="
     },
-    "ignore-walk": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.4.tgz",
-      "integrity": "sha512-PY6Ii8o1jMRA1z4F2hRkH/xN59ox43DavKvD3oDpfurRlOJyAHpifIwpbdv1n4jt4ov0jSpw3kQ4GhJnpBL6WQ==",
-      "dev": true,
-      "requires": {
-        "minimatch": "^3.0.4"
-      }
-    },
     "import-fresh": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
@@ -31562,15 +31413,6 @@
       "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
       "dev": true
     },
-    "stream-events": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
-      "integrity": "sha512-E1GUzBSgvct8Jsb3v2X15pjzN1tYebtbLaMg+eBOUOAxgbLoSbT2NS91ckc5lJD1KfLjId+jXJRgo0qnV5Nerg==",
-      "dev": true,
-      "requires": {
-        "stubs": "^3.0.0"
-      }
-    },
     "string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -31693,12 +31535,6 @@
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
       "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig=="
     },
-    "stubs": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
-      "integrity": "sha512-PdHt7hHUJKxvTCgbKX9C1V/ftOcjJQgz8BZwNfV5c4B6dcGqlpelTbJ999jBGZ2jYiPAwcX5dP6oBwVlBlUbxw==",
-      "dev": true
-    },
     "stylehacks": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/stylehacks/-/stylehacks-5.1.0.tgz",
@@ -31896,19 +31732,6 @@
         }
       }
     },
-    "teeny-request": {
-      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-7.1.1.tgz",
-      "integrity": "sha512-iwY6rkW5DDGq8hE2YgNQlKbptYpY5Nn2xecjQiNjOXWbKzPGUfmeUBCSQbbr306d7Z7U2N0TPl+/SwYRfua1Dg==",
-      "dev": true,
-      "requires": {
-        "http-proxy-agent": "^4.0.0",
-        "https-proxy-agent": "^5.0.0",
-        "node-fetch": "^2.6.1",
-        "stream-events": "^1.0.5",
-        "uuid": "^8.0.0"
-      }
-    },
     "terminal-link": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
@@ -32347,15 +32170,6 @@
         "requires-port": "^1.0.0"
       }
     },
-    "urlgrey": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-1.0.0.tgz",
-      "integrity": "sha512-hJfIzMPJmI9IlLkby8QrsCykQ+SXDeO2W5Q9QTW3QpqZVTx4a/K7p8/5q+/isD8vsbVaFgql/gvAoQCRQ2Cb5w==",
-      "dev": true,
-      "requires": {
-        "fast-url-parser": "^1.1.3"
-      }
-    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -32380,12 +32194,6 @@
       "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
       "dev": true
     },
-    "uuid": {
-      "version": "8.3.2",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
-      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
-      "dev": true
-    },
     "v8-compile-cache": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
diff --git a/client/package.json b/client/package.json
index 3973e0ab..e635c170 100644
--- a/client/package.json
+++ b/client/package.json
@@ -101,7 +101,6 @@
     "cheerio": "^1.0.0-rc.6",
     "clean-css": "^5.1.2",
     "clean-webpack-plugin": "^4.0.0-alpha.0",
-    "codecov": "^3.7.1",
     "css-loader": "^5.2.4",
     "css-minimizer-webpack-plugin": "^4.0.0",
     "eslint": "^7.24.0",
diff --git a/server/requirements-dev.txt b/server/requirements-dev.txt
index 2903e95f..24765420 100644
--- a/server/requirements-dev.txt
+++ b/server/requirements-dev.txt
@@ -1,6 +1,6 @@
 black
 bumpversion>=0.5
-codecov>=2.0.15
+coverage>=5.0
 parameterized>=0.7.0
 pytest>=3.6.3
 python-jose>=3.2.0