diff --git a/.bashrc b/.bashrc
index 8bb8a8d..a6ab076 100644
--- a/.bashrc
+++ b/.bashrc
@@ -14,6 +14,11 @@ export SHELL
 #     return # ... and don't do anything else.
 # fi
 
+expedir_basename="corona_cases"
+prjdir=$(pwd)
+currdir_basename=$(basename $prjdir)
+pgdata=./var/pg/data
+
 if [ -n "$GUIX_ENVIRONMENT" ]; then
     # /run is not automatically created by guix
     [ ! -d /run ] && mkdir /run
@@ -21,6 +26,13 @@ if [ -n "$GUIX_ENVIRONMENT" ]; then
     # Quick access to $GUIX_ENVIRONMENT, for usage on config files
     # (currently only /etc/nginx/nginx.conf)
     [ ! -L /env ] && ln -s $GUIX_ENVIRONMENT /env
+    
+    [ ! -d ./node_modules ] && npm install heroku
+
+    if [ ! -L ./node_modules/heroku/bin/heroku ]; then
+        ln -s ./node_modules/heroku/bin/run ./node_modules/heroku/bin/heroku
+    fi
+    export PATH=$PATH:$prjdir/node_modules/heroku/bin
 fi
 
 # # Link every file in /usr/etc on /etc
@@ -29,11 +41,6 @@ fi
 #     [ ! -L $bname ] && ln -s $filepath $bname
 # done
 
-expedir_basename="corona_cases"
-prjdir=$(pwd)
-currdir_basename=$(basename $prjdir)
-pgdata=./var/pg/data
-
 test_db () {
     # for long names of keywords, use:
     #   select * from thresholds where kw in ('rec', 'dea', 'act', 'new') order by kw;
diff --git a/.heroku-local.env b/.custom.env
similarity index 93%
rename from .heroku-local.env
rename to .custom.env
index f551bfe..98c72a1 100644
--- a/.heroku-local.env
+++ b/.custom.env
@@ -3,7 +3,8 @@
 
 # The value must be one of `(keys corona.envdef/environment)`;
 # lower-cased and not surrounded by the double quote chars "".
-CORONA_ENV_TYPE=local
+# CORONA_ENV_TYPE=local
+CORONA_ENV_TYPE=devel
 
 # https://clojure.org/guides/getting_started#_installation_on_linux
 CLOJURE_CLI_VERSION=1.11.1.1165
diff --git a/.gitignore b/.gitignore
index cae99c9..65db657 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,7 @@
 /resources/mockup/
 /var/run/
 /log/
+/node_modules/
+/package-lock.json
+/package.json
+/corona.log
diff --git a/Procfile b/Procfile
index f472335..cb88ca1 100644
--- a/Procfile
+++ b/Procfile
@@ -7,4 +7,4 @@
 
 # -Xmx<size> : increase max heap size from default 300MB
 # Keep in sync with .dir-locals.el and .bashrc
-web: java -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError -Djdk.attach.allowAttachSelf $JVM_OPTS -cp target/corona_cases-standalone.jar clojure.main -m corona.web.core
+web: java -Xmx8192m -XX:+HeapDumpOnOutOfMemoryError -Djdk.attach.allowAttachSelf $JVM_OPTS -cp target/corona_cases-standalone.jar clojure.main -m corona.web.core
diff --git a/README.md b/README.md
index 48e903a..d6f9ef0 100644
--- a/README.md
+++ b/README.md
@@ -168,9 +168,9 @@ unix_socket_directories = '/tmp'  # comma-separated list of directories
 # start Postgres
 pg_ctl --pgdata=./var/pg --log=./var/log/postgres.log start # on Guix
 # pg_ctl --pgdata=./var/pg stop
-bin/build; and heroku local --env=.heroku-local.env
+bin/build && heroku local --env=.custom.env
 # or:
-# bin/build; and heroku local --env=.heroku-local.env --set COMMIT=...
+# bin/build && heroku local --env=.custom.env --set COMMIT=...
 ```
 
 ## Heroku CI pipeline
@@ -195,8 +195,6 @@ psql --dbname=postgres   --quiet            --file=dbase/my.sql
 psql --dbname=postgres
 ```
 
-```bash
-```
 then
 ```postgres
 -- help
diff --git a/manifest.scm b/manifest.scm
index 196b02b..28f3376 100644
--- a/manifest.scm
+++ b/manifest.scm
@@ -101,5 +101,11 @@
   sed
   which
 
+  ;; #begin# for heroku installation
+  (@(gnu packages node) node-lts)
+  (@(gnu packages python) python)
+  (@(gnu packages base) gnu-make) ;; i.e. `make`
+  ;; #end# for heroku installation
+
   (@(gnu packages admin) neofetch) ;; pimp my ride
   ))