try with a direct reference in setup.cfg

.circleci/config.yml

@@ -120,9 +120,6 @@ jobs:
             # dependencies into the environment.
             venv/bin/pip install --no-index --find-links file://${PWD}/wheelhouse .[test]
 
-            # For a while we depend on a pretty fresh Tahoe
-            pip install https://github.com/tahoe-lafs/tahoe-lafs/archive/refs/heads/3842.allocate_buckets-without-lease-renewal.zip
-
       - run:
           name: "Test"
           command: |

.github/workflows/ci.yaml

@@ -40,8 +40,6 @@ jobs:
     - name: "Install ZKAPAuthorizer and dependencies"
       run: |
         python -m pip install -v ./[test]
-        # For a while we depend on a pretty fresh Tahoe
-        pip install https://github.com/tahoe-lafs/tahoe-lafs/archive/refs/heads/3842.allocate_buckets-without-lease-renewal.zip
 
     - name: "Dump Python Environment"
       run: |

setup.cfg

@@ -40,7 +40,12 @@ install_requires =
     # incompatible with Tahoe-LAFS'.  So duplicate them here (the ones that
     # have been observed to cause problems).
     Twisted[tls,conch]>=18.4.0
-    tahoe-lafs >=1.14, <1.17, !=1.15.*
+
+    # Lease renewal changes aren't available from a release of Tahoe yet, or
+    # even the main branch...  Note "Public index servers SHOULD NOT allow the
+    # use of direct references in uploaded distributions."
+    # https://www.python.org/dev/peps/pep-0440/#direct-references
+    tahoe-lafs @ https://github.com/tahoe-lafs/tahoe-lafs/archive/refs/heads/3842.allocate_buckets-without-lease-renewal.zip
     treq
     pyutil