diff --git a/.circleci/config.yml b/.circleci/config.yml
index a4f7721f9..0f32c56ac 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -86,35 +86,6 @@ jobs:
           command: |
             ~/project/.circleci/bootstrap-test-environment.sh ~/project
 
-      - restore_cache: &RESTORE_HTTP_CACHE
-          name: "Restoring pip HTTP cache"
-          keys:
-            # An exact match on the http cache key is great.  It should have
-            # exactly the packages (tgz, whl, whatever) we need.
-            - v5-pip-http-{{ checksum "/tmp/project/setup.py" }}-{{ checksum "/tmp/project/src/allmydata/_auto_deps.py" }}
-            # A prefix match is okay too.  It might have a
-            # partially-overlapping set of packages.  That's a head-start, at
-            # least.  We might have to download a few more things but at least
-            # we saved a little time.  After we download some more stuff we'll
-            # create a new cache entry with the full key above and the next
-            # build will get a better cache hit.
-            - v5-pip-http-
-
-      - restore_cache: &RESTORE_WHEELHOUSE
-          name: "Restoring wheelhouse"
-          keys:
-            # As above, an exact match is great.  Here, we also need to
-            # include the job name to make sure the platform ABI matches.
-            # There are binary wheels in this wheelhouse and we're not taking
-            # care to make manylinux1 wheels.  The binary wheels in this cache
-            # will only work on some Linux distros.
-            - v4-wheelhouse-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/project/setup.py" }}-{{ checksum "/tmp/project/src/allmydata/_auto_deps.py" }}
-            # A partial match is okay too.  It'll get us at least some of the
-            # wheels.  We do need to keep the job name as part of the key or
-            # we might get binary wheels build against an incompatible ABI and
-            # we won't be able to use them (and they'll break the build rather
-            # than being ignored).
-            - v4-wheelhouse-{{ .Environment.CIRCLE_JOB }}
 
       - run: &SETUP_VIRTUALENV
           name: "Setup virtualenv"
@@ -126,21 +97,6 @@ jobs:
                 "${TAHOE_LAFS_TOX_ENVIRONMENT}" \
                 "${TAHOE_LAFS_TOX_ARGS}"
 
-      - save_cache: &SAVE_HTTP_CACHE
-          name: "Saving pip HTTP cache"
-          key: v5-pip-http-{{ checksum "/tmp/project/setup.py" }}-{{ checksum "/tmp/project/src/allmydata/_auto_deps.py" }}
-          paths:
-            # Perfectly valid for Linux.  Note we exclude the wheel cache
-            # because we want this cache to be valid across all platforms and
-            # the wheels in the pip wheel cache are not necessarily so.
-            - "/tmp/nobody/.cache/pip/http"
-
-      - save_cache: &SAVE_WHEELHOUSE
-          name: "Caching wheelhouse"
-          key: v4-wheelhouse-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/project/setup.py" }}-{{ checksum "/tmp/project/src/allmydata/_auto_deps.py" }}
-          paths:
-            - *WHEELHOUSE_PATH
-
       - run: &RUN_TESTS
           name: "Run test suite"
           # Something about when it re-uses an existing environment blows up
@@ -225,16 +181,12 @@ jobs:
       - "checkout"
       # DRY, YAML-style.  See the debian-9 steps.
       - run: *BOOTSTRAP_TEST_ENVIRONMENT
-      - restore_cache: *RESTORE_HTTP_CACHE
-      - restore_cache: *RESTORE_WHEELHOUSE
       - run: *SETUP_VIRTUALENV
       - run:
           name: "Install Tor"
           command: |
             # Don't forget that we moved the source tree to /tmp.
             /tmp/project/integration/install-tor.sh
-      - save_cache: *SAVE_HTTP_CACHE
-      - save_cache: *SAVE_WHEELHOUSE
       - run: *RUN_TESTS
 
 
@@ -294,14 +246,8 @@ jobs:
             yum install --assumeyes \
                 net-tools
 
-      - restore_cache: *RESTORE_HTTP_CACHE
-      - restore_cache: *RESTORE_WHEELHOUSE
-
       - run: *SETUP_VIRTUALENV
 
-      - save_cache: *SAVE_HTTP_CACHE
-      - save_cache: *SAVE_WHEELHOUSE
-
       - run: *RUN_TESTS
 
       - store_test_results: *STORE_TEST_RESULTS
@@ -390,14 +336,8 @@ jobs:
             python get-pip.py
             pip install virtualenv
 
-      - restore_cache: *RESTORE_HTTP_CACHE
-      - restore_cache: *RESTORE_WHEELHOUSE
-
       - run: *SETUP_VIRTUALENV
 
-      - save_cache: *SAVE_HTTP_CACHE
-      - save_cache: *SAVE_WHEELHOUSE
-
       - run: *RUN_TESTS
 
       - store_test_results: *STORE_TEST_RESULTS