diff --git a/.circleci/config.yml b/.circleci/config.yml
index 42e47957c..ad5360082 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -86,11 +86,6 @@ workflows:
             # integration tests.
             - "debian-9"
 
-      # Generate the underlying data for a visualization to aid with Python 3
-      # porting.
-      - "build-porting-depgraph":
-          <<: *DOCKERHUB_CONTEXT
-
       - "typechecks":
           <<: *DOCKERHUB_CONTEXT
 
@@ -451,33 +446,6 @@ jobs:
             # them in parallel.
             nix-build --cores 3 --max-jobs 2 nix/
 
-  # Generate up-to-date data for the dependency graph visualizer.
-  build-porting-depgraph:
-    # Get a system in which we can easily install Tahoe-LAFS and all its
-    # dependencies.  The dependency graph analyzer works by executing the code.
-    # It's Python, what do you expect?
-    <<: *DEBIAN
-
-    steps:
-      - "checkout"
-
-      - add_ssh_keys:
-          fingerprints:
-            # Jean-Paul Calderone <exarkun@twistedmatrix.com> (CircleCI depgraph key)
-            # This lets us push to tahoe-lafs/tahoe-depgraph in the next step.
-            - "86:38:18:a7:c0:97:42:43:18:46:55:d6:21:b0:5f:d4"
-
-      - run:
-          name: "Setup Python Environment"
-          command: |
-            /tmp/venv/bin/pip install -e /tmp/project
-
-      - run:
-          name: "Generate dependency graph data"
-          command: |
-            . /tmp/venv/bin/activate
-            ./misc/python3/depgraph.sh
-
   typechecks:
     docker:
       - <<: *DOCKERHUB_AUTH