diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6ea8320a7e38..6e02c5f486ce 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -12,14 +12,10 @@ version: 2.1
 # Variables
 
 ## IMPORTANT
-# If you change the cache key prefix, also sync the fallback_cache_key fallback to match.
-# Keep the static part of the cache key as prefix to enable correct fallbacks.
 # Windows needs its own cache key because binaries in node_modules are different.
 # See https://circleci.com/docs/2.0/caching/#restoring-cache for how prefixes work in CircleCI.
-var_1: &cache_key angular_devkit-0.12.0-{{ checksum "yarn.lock" }}
-var_2: &cache_key_fallback angular_devkit-0.12.0
-var_1_win: &cache_key_win angular_devkit-win-0.12.0-{{ checksum "yarn.lock" }}
-var_2_win: &cache_key_fallback_win angular_devkit-win-0.12.0
+var_1: &cache_key angular_devkit-12.9-{{ checksum "yarn.lock" }}
+var_1_win: &cache_key_win angular_devkit-win-12.9-{{ checksum "yarn.lock" }}
 var_3: &default_nodeversion "12.9"
 # Workspace initially persisted by the `setup` job, and then enhanced by `setup-and-build-win`.
 # https://circleci.com/docs/2.0/workflows/#using-workspaces-to-share-data-among-jobs
@@ -133,7 +129,6 @@ jobs:
       - restore_cache:
           keys:
             - *cache_key
-            - *cache_key_fallback
       - run: yarn install --frozen-lockfile
       - persist_to_workspace:
           root: *workspace_location
@@ -308,7 +303,6 @@ jobs:
       - restore_cache:
           keys:
             - *cache_key_win
-            - *cache_key_fallback_win
       - run: yarn install --frozen-lockfile
       - run: yarn build
       - save_cache: