diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3a38a2c..29eeac35 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,7 +22,7 @@ _None._
 
 ### Bug Fixes
 
-- Fix the `annotate_test_failures` to include test cases with error nodes in the failures list. [#58]
+_None._
 
 ### Internal Changes
 
@@ -38,11 +38,11 @@ _None._
 
 ### New Features
 
-_None._
+- When `install_cocoapods` fails because `Podfile.lock` changed in CI, it now prints a diff of the changes [#59]
 
 ### Bug Fixes
 
-_None._
+- Fix the `annotate_test_failures` to include test cases with error nodes in the failures list. [#58]
 
 ### Internal Changes
 
diff --git a/bin/install_cocoapods b/bin/install_cocoapods
index 980ecf32..83cb46f5 100755
--- a/bin/install_cocoapods
+++ b/bin/install_cocoapods
@@ -32,8 +32,20 @@ else
 fi
 
 function lockfile_error () {
-  message="\`Podfile.lock\` was changed by \`bundle exec pod install\`. Please run \`bundle exec pod install\` locally with a clean cache and commit the result."
+  message=$(cat <<EOF
+  \`Podfile.lock\` was changed by \`bundle exec pod install\`. Please run \`bundle exec pod install\` locally with a clean cache and commit the result.
+
+  <details><summary>See diff</summary>
+
+  \`\`\`
+  $(git diff -- Podfile.lock)
+  \`\`\`
+  </details>
+EOF
+  )
+
   echo "$message"
+
   buildkite-agent annotate "$message" --style 'error' --context 'ctx-error'
 }
 trap lockfile_error ERR