diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 98a6044..f7d5454 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,9 +30,9 @@ check_commits:
   before_script:
     - apk add git
     - npm install -g @commitlint/cli @commitlint/config-conventional
-    - git pull origin master
+    - git checkout origin/master
   script:
-    - npx commitlint --from origin/master --to HEAD --verbose
+    - npx commitlint --from origin/master --to ${CI_COMMIT_SHA} --verbose
 
 compile_jvm:
   stage: compile
@@ -48,10 +48,10 @@ test_jvm:
   image: gumjoe/wacc-ci-scala:x86
   stage: test
   # Use our own runner (not cloud VM or shared) to ensure we have multiple cores.
-  tags: [ large ]
+  tags: [large]
   # This is expensive, so do use `dependencies` instead of `needs` to
   # ensure all previous stages pass.
-  dependencies: [ compile_jvm ]
+  dependencies: [compile_jvm]
   before_script:
     - git clone https://$EXAMPLES_AUTH@gitlab.doc.ic.ac.uk/lab2425_spring/wacc-examples.git
   script: