diff --git a/.ci/build-plt-cache.sh b/.ci/build-plt-cache.sh
deleted file mode 100755
index 53842593..00000000
--- a/.ci/build-plt-cache.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-# This script builds/restores PLT cache files to/from a cache at ~/.pltcache
-set -ex
-
-# "Mix will default to the :dev environment"
-MIX_ENV="${MIX_ENV:-dev}"
-
-mix compile
-
-# Create the PLT cache directory, if it doesn't already exist
-mkdir -p "$HOME"/.pltcache
-# Copy the PLT files into the _build directory, if they exist
-cp "$HOME"/.pltcache/*-"$MIX_ENV".plt _build/"$MIX_ENV"/ || true
-
-# Build the PLT cache (uses the existing one if present)
-mix dialyzer --plt
-
-# Copy the PLT files into the cache so they can be used next time
-cp _build/"$MIX_ENV"/*-"$MIX_ENV".plt "$HOME"/.pltcache/
diff --git a/.github/workflows/cron_ci.yml b/.github/workflows/cron_ci.yml
deleted file mode 100644
index 6a0d0d1a..00000000
--- a/.github/workflows/cron_ci.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: Cron CI
-
-on:
-  schedule:
-    - cron:  '0 0 * * 0'
-
-jobs:
-  interop-tests:
-    runs-on: ubuntu-latest
-    name: Interop tests
-    container:
-      image: elixir:1.9
-    steps:
-    - uses: actions/checkout@v2
-    - name: Install Dependencies
-      run: |
-        mix local.rebar --force
-        mix local.hex --force
-        mix deps.get
-      working-directory: ./interop
-    - name: Run Cron CI
-      run: make ci-cron
diff --git a/Makefile b/Makefile
index efc78c46..33479e25 100644
--- a/Makefile
+++ b/Makefile
@@ -18,10 +18,4 @@ test-all:
 	mix test
 	cd interop && mix run script/run.exs
 
-# This is heavy
-ci-cron:
-	cd interop && mix deps.get && mix run script/run.exs --rounds 1000 --concurrency 30 && cd -
-	mix deps.get && bash .ci/build-plt-cache.sh && mix dialyzer
-
-
 .PHONY: test release test-prepare test-all ci-cron