diff --git a/.circleci/python_job.bash b/.circleci/python_job.bash
index d804f2b27f..34d84e6aaf 100644
--- a/.circleci/python_job.bash
+++ b/.circleci/python_job.bash
@@ -84,17 +84,22 @@ function run_build_glean {
     set -x
     glean_parser translate --format python_server --output ${OUTPUT_FOLDER} ${INPUT_YAML}
     black ${OUTPUT_FOLDER}
+    { set +x; } 2>/dev/null
     case "$OSTYPE" in
         darwin* | bsd*)
             echo "Using BSD sed";
+            set -x;
             sed -i '' \
                 -e 's/^AUTOGENERATED BY glean_parser \(.* DO NOT EDIT.\) DO NOT COMMIT.$/AUTOGENERATED BY glean_parser \1 To recreate, run:\n\nbash .circleci\/python_job.bash run build_glean/' \
-                ${OUTPUT_FOLDER}/server_events.py;;
+                ${OUTPUT_FOLDER}/server_events.py;
+            { set +x; } 2>/dev/null;;
         linux*)
             echo "Using GNU sed";
+            set -x;
             sed -i \
                 -e 's/^AUTOGENERATED BY glean_parser \(.* DO NOT EDIT.\) DO NOT COMMIT.$/AUTOGENERATED BY glean_parser \1 To recreate, run:\n\nbash .circleci\/python_job.bash run build_glean/' \
-                ${OUTPUT_FOLDER}/server_events.py;;
+                ${OUTPUT_FOLDER}/server_events.py;
+            { set +x; } 2>/dev/null;;
         *)
             echo "Unknown OSTYPE '${OSTYPE}'";;
     esac
@@ -107,19 +112,27 @@ function run_check_glean {
     echo "Re-running glean_parser..."
     echo
     run_build_glean $GLEAN_TEST_FOLDER
-    set +x
+    { set +x; } 2>/dev/null
 
     echo
     echo "Checking new files against checked-in files..."
     local HAS_DIFFS=0
     local HAS_FILES=0
     local EXIT_CODE=0
-    for FILENAME in `find ${GLEAN_TEST_FOLDER} -type f -exec basename \{\} \;`
+    for FILENAME in `find ${GLEAN_TEST_FOLDER} -type f -name '*.py' -exec basename \{\} \;`
     do
         HAS_FILES=1
-        if [[ 0 -ne `cmp --silent "${GLEAN_TEST_FOLDER}/${FILENAME}" "${GLEAN_OUTPUT_FOLDER}/${FILENAME}"` ]]
+        RETVAL=0
+        /usr/bin/cmp --silent "${GLEAN_TEST_FOLDER}/${FILENAME}" "${GLEAN_OUTPUT_FOLDER}/${FILENAME}" || RETVAL=$?
+        if [ $RETVAL -eq 1 ]
         then
             HAS_DIFFS=1
+        elif [ $RETVAL -gt 1 ]
+        then
+            echo "cmp returned $RETVAL!"
+            set -x
+            /usr/bin/cmp --silent "${GLEAN_TEST_FOLDER}/${FILENAME}" "${GLEAN_OUTPUT_FOLDER}/${FILENAME}"
+            exit 1
         fi
     done
     if [ $HAS_FILES -eq 0 ]
@@ -130,7 +143,8 @@ function run_check_glean {
     if [ $HAS_DIFFS -eq 1 ]
     then
         echo "*** Differences detected - need to re-run glean_parser ***"
-        diff $GLEAN_OUTPUT_FOLDER $GLEAN_TEST_FOLDER
+        diff --exclude '__pycache__' $GLEAN_OUTPUT_FOLDER $GLEAN_TEST_FOLDER || true
+        echo "*** End of differences***"
         EXIT_CODE=1
     fi
     if [ "$GLEAN_TEST_FOLDER" != "" ]
@@ -141,6 +155,15 @@ function run_check_glean {
     if [ $EXIT_CODE -eq 0 ]
     then
         echo "✓ Files are identical"
+    elif [ $HAS_DIFFS -eq 1 ]
+    then
+        echo
+        echo "To fix, run:"
+        echo
+        echo "  bash .circleci/python_job.bash run build_glean"
+        echo
+        echo "and add as a commit to this pull request."
+        exit 1
     else
         exit 1
     fi
diff --git a/privaterelay/glean/server_events.py b/privaterelay/glean/server_events.py
index ad575caf47..cf36cc8a4f 100644
--- a/privaterelay/glean/server_events.py
+++ b/privaterelay/glean/server_events.py
@@ -3,7 +3,7 @@
 License, v. 2.0. If a copy of the MPL was not distributed with this
 file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-AUTOGENERATED BY glean_parser v12.0.1. DO NOT EDIT. To recreate, run:
+AUTOGENERATED BY glean_parser v13.0.0. DO NOT EDIT. To recreate, run:
 
 bash .circleci/python_job.bash run build_glean
 """
@@ -48,7 +48,7 @@ def _record(self, user_agent: str, ip_address: str, event: dict[str, Any]) -> No
             # `Unknown` fields below are required in the Glean schema, however they are
             # not useful in server context
             "client_info": {
-                "telemetry_sdk_build": "glean_parser v12.0.1",
+                "telemetry_sdk_build": "glean_parser v13.0.0",
                 "first_run_date": "Unknown",
                 "os": "Unknown",
                 "os_version": "Unknown",
diff --git a/requirements.txt b/requirements.txt
index 9e4cdad35f..d4cc90731b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ django-waffle==4.1.0
 dockerflow==2024.3.0
 drf-spectacular==0.27.1
 drf-spectacular-sidecar==2024.3.1
-glean_parser==12.0.1
+glean_parser==13.0.0
 google-measurement-protocol==1.1.0
 google-cloud-profiler==4.1.0
 gunicorn==21.2.0