diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9e5c3bd27b7..2870e53f4fb 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -101,6 +101,8 @@ refs:
           # Setting default number of threads to 2
           # since circleci allocates 2 cpus per test container
           GHCRTS: -N2
+          # Until we can use a real webserver for TestEventFlood, limit concurrency:
+          HASURA_GRAPHQL_EVENTS_HTTP_POOL_SIZE: 8
           HASURA_GRAPHQL_DATABASE_URL: postgresql://gql_test:@localhost:5432/gql_test
           HASURA_GRAPHQL_DATABASE_URL_2: postgresql://gql_test:@localhost:5432/gql_test2
           GRAPHQL_ENGINE: /build/_server_output/graphql-engine
diff --git a/scripts/dev.sh b/scripts/dev.sh
index 9e1157f24d2..85de9b91c9c 100755
--- a/scripts/dev.sh
+++ b/scripts/dev.sh
@@ -320,6 +320,9 @@ elif [ "$MODE" = "test" ]; then
   ########################################
   cd "$PROJECT_ROOT/server"
 
+  # Until we can use a real webserver for TestEventFlood, limit concurrency
+  export HASURA_GRAPHQL_EVENTS_HTTP_POOL_SIZE=8
+
   # We'll get an hpc error if these exist; they will be deleted below too:
   rm -f graphql-engine-tests.tix graphql-engine.tix graphql-engine-combined.tix