diff --git a/.buildkite/identity_tests.yml b/.buildkite/identity_tests.yml
--- a/.buildkite/identity_tests.yml
+++ b/.buildkite/identity_tests.yml
@@ -2,6 +2,6 @@
   - label: ":nix: Identity Tests (Nix)"
     command:
       - 'cd services/identity'
-      - 'nix develop --command cargo test'
+      - 'nix develop --accept-flake-config --command cargo test'
     agents:
       - 'mac=true'
diff --git a/.buildkite/nix_yarn.yml b/.buildkite/nix_yarn.yml
--- a/.buildkite/nix_yarn.yml
+++ b/.buildkite/nix_yarn.yml
@@ -1,5 +1,5 @@
 steps:
   - label: 'nix develop -c yarn cleaninstall'
-    command: 'nix develop -c yarn cleaninstall'
+    command: 'nix develop --accept-flake-config -c yarn cleaninstall'
     agents:
       - 'nixdarwin=true'
diff --git a/.buildkite/tunnelbroker_unittests.yml b/.buildkite/tunnelbroker_unittests.yml
--- a/.buildkite/tunnelbroker_unittests.yml
+++ b/.buildkite/tunnelbroker_unittests.yml
@@ -3,7 +3,7 @@
     command:
       - 'cd services/tunnelbroker'
       - 'rm -rf build && mkdir build && cd build'
-      - 'nix develop --command bash -c "cmake .. && make -j"'
+      - 'nix develop --accept-flake-config --command bash -c "cmake .. && make -j"'
       - './bin/runTests --gtest_filter=-AmqpManager*:DatabaseManager*'
     agents:
       - 'mac=true'