diff --git a/REFERENCE.md b/REFERENCE.md
index 1169a603d..9883f50e1 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -127,6 +127,7 @@ The following parameters are available in the `mongodb::globals` class:
 
 * [`server_package_name`](#-mongodb--globals--server_package_name)
 * [`client_package_name`](#-mongodb--globals--client_package_name)
+* [`client_version`](#-mongodb--globals--client_version)
 * [`mongod_service_manage`](#-mongodb--globals--mongod_service_manage)
 * [`service_enable`](#-mongodb--globals--service_enable)
 * [`service_ensure`](#-mongodb--globals--service_ensure)
@@ -168,6 +169,14 @@ If not specified, the module will use whatever service name is the default for y
 
 Default value: `undef`
 
+##### <a name="-mongodb--globals--client_version"></a>`client_version`
+
+Data type: `Any`
+
+Version of the client package to install.
+
+Default value: `undef`
+
 ##### <a name="-mongodb--globals--mongod_service_manage"></a>`mongod_service_manage`
 
 Data type: `Any`
diff --git a/lib/facter/is_master.rb b/lib/facter/is_master.rb
index 40ce49e59..6aeea3c01 100644
--- a/lib/facter/is_master.rb
+++ b/lib/facter/is_master.rb
@@ -39,17 +39,17 @@ def get_options_from_config(file)
 
 Facter.add('mongodb_is_master') do
   setcode do
-    if %w[mongo mongod].all? { |m| Facter::Util::Resolution.which m }
+    if %w[mongosh mongod].all? { |m| Facter::Util::Resolution.which m }
       file = mongod_conf_file
       if file
         options = get_options_from_config(file)
-        e = File.exist?('/root/.mongorc.js') ? 'load(\'/root/.mongorc.js\'); ' : ''
+        e = File.exist?('/root/.mongoshrc.js') ? 'load(\'/root/.mongoshrc.js\'); ' : ''
 
         # Check if the mongodb server is responding:
-        Facter::Core::Execution.exec("mongo --quiet #{options} --eval \"#{e}printjson(db.adminCommand({ ping: 1 }))\"")
+        Facter::Core::Execution.exec("mongosh --quiet #{options} --eval \"#{e}EJSON.stringify(db.adminCommand({ ping: 1 }))\"")
 
         if $CHILD_STATUS.success?
-          Facter::Core::Execution.exec("mongo --quiet #{options} --eval \"#{e}db.isMaster().ismaster\"")
+          Facter::Core::Execution.exec("mongosh --quiet #{options} --eval \"#{e}db.isMaster().ismaster\"")
         else
           'not_responding'
         end
diff --git a/lib/puppet/provider/mongodb.rb b/lib/puppet/provider/mongodb.rb
index 81e4ed7d8..b8f59cb2c 100644
--- a/lib/puppet/provider/mongodb.rb
+++ b/lib/puppet/provider/mongodb.rb
@@ -8,15 +8,15 @@
 class Puppet::Provider::Mongodb < Puppet::Provider
   # Without initvars commands won't work.
   initvars
-  commands mongo: 'mongo'
+  commands mongosh: 'mongosh'
 
   # Optional defaults file
-  def self.mongorc_file
-    "load('#{Facter.value(:root_home)}/.mongorc.js'); " if File.file?("#{Facter.value(:root_home)}/.mongorc.js")
+  def self.mongoshrc_file
+    "load('#{Facter.value(:root_home)}/.mongoshrc.js'); " if File.file?("#{Facter.value(:root_home)}/.mongoshrc.js")
   end
 
-  def mongorc_file
-    self.class.mongorc_file
+  def mongoshrc_file
+    self.class.mongoshrc_file
   end
 
   def self.mongod_conf_file
@@ -74,7 +74,7 @@ def self.tls_invalid_hostnames(config = nil)
     config['tlsallowInvalidHostnames']
   end
 
-  def self.mongo_cmd(db, host, cmd)
+  def self.mongosh_cmd(db, host, cmd)
     config = mongo_conf
 
     args = [db, '--quiet', '--host', host]
@@ -101,7 +101,7 @@ def self.mongo_cmd(db, host, cmd)
     end
 
     args += ['--eval', cmd]
-    mongo(args)
+    mongosh(args)
   end
 
   def self.conn_string
@@ -138,7 +138,7 @@ def self.conn_string
   def self.db_ismaster
     cmd_ismaster = 'db.isMaster().ismaster'
     db = 'admin'
-    res = mongo_cmd(db, conn_string, cmd_ismaster).to_s.split(%r{\n}).last.chomp
+    res = mongosh_cmd(db, conn_string, cmd_ismaster).to_s.split(%r{\n}).last.chomp
     res.eql?('true')
   end
 
@@ -155,14 +155,14 @@ def self.auth_enabled(config = nil)
   def self.mongo_eval(cmd, db = 'admin', retries = 10, host = nil)
     retry_count = retries
     retry_sleep = 3
-    cmd = mongorc_file + cmd if mongorc_file
+    cmd = mongoshrc_file + cmd if mongoshrc_file
 
     out = nil
     begin
       out = if host
-              mongo_cmd(db, host, cmd)
+              mongosh_cmd(db, host, cmd)
             else
-              mongo_cmd(db, conn_string, cmd)
+              mongosh_cmd(db, conn_string, cmd)
             end
     rescue StandardError => e
       retry_count -= 1
@@ -173,7 +173,7 @@ def self.mongo_eval(cmd, db = 'admin', retries = 10, host = nil)
       end
     end
 
-    raise Puppet::ExecutionFailure, "Could not evaluate MongoDB shell command: #{cmd}" unless out
+    raise Puppet::ExecutionFailure, "Could not evaluate MongoDB shell command: #{cmd}, with: #{e.message}" unless out
 
     Puppet::Util::MongodbOutput.sanitize(out)
   end
diff --git a/lib/puppet/provider/mongodb_database/mongodb.rb b/lib/puppet/provider/mongodb_database/mongodb.rb
index 5dabe4365..a03cd6294 100644
--- a/lib/puppet/provider/mongodb_database/mongodb.rb
+++ b/lib/puppet/provider/mongodb_database/mongodb.rb
@@ -9,8 +9,8 @@
   def self.instances
     require 'json'
 
-    pre_cmd = 'try { rs.secondaryOk() } catch (err) { rs.slaveOk() }'
-    dbs = JSON.parse mongo_eval("#{pre_cmd};printjson(db.getMongo().getDBs())")
+    pre_cmd = 'db.getMongo().setReadPref("primaryPreferred")'
+    dbs = JSON.parse mongo_eval("#{pre_cmd};EJSON.stringify(db.getMongo().getDBs())")
 
     dbs['databases'].map do |db|
       new(name: db['name'],
diff --git a/lib/puppet/provider/mongodb_replset/mongo.rb b/lib/puppet/provider/mongodb_replset/mongo.rb
index 7837533e2..98cc89404 100644
--- a/lib/puppet/provider/mongodb_replset/mongo.rb
+++ b/lib/puppet/provider/mongodb_replset/mongo.rb
@@ -153,31 +153,32 @@ def get_hosts_status(members)
     members.select do |member|
       host = member['host']
       Puppet.debug "Checking replicaset member #{host} ..."
-      status = rs_status(host)
-      raise Puppet::Error, "Can't configure replicaset #{name}, host #{host} is not supposed to be part of a replicaset." if status.key?('errmsg') && status['errmsg'] == 'not running with --replSet'
-
-      if auth_enabled && status.key?('errmsg') && (status['errmsg'].include?('unauthorized') || status['errmsg'].include?('not authorized') || status['errmsg'].include?('requires authentication'))
-        Puppet.warning "Host #{host} is available, but you are unauthorized because of authentication is enabled: #{auth_enabled}"
-        alive.push(member)
-      end
-
-      if status.key?('errmsg') && status['errmsg'].include?('no replset config has been received')
-        Puppet.debug 'Mongo v4 rs.status() RS not initialized output'
-        alive.push(member)
-      end
-
-      if status.key?('set')
-        raise Puppet::Error, "Can't configure replicaset #{name}, host #{host} is already part of another replicaset." if status['set'] != name
-
-        # This node is alive and supposed to be a member of our set
-        Puppet.debug "Host #{host} is available for replset #{status['set']}"
-        alive.push(member)
-      elsif status.key?('info')
-        Puppet.debug "Host #{host} is alive but unconfigured: #{status['info']}"
-        alive.push(member)
+      begin
+        status = rs_status(host)
+
+        if status.key?('set')
+          raise Puppet::Error, "Can't configure replicaset #{name}, host #{host} is already part of another replicaset." if status['set'] != name
+
+          # This node is alive and supposed to be a member of our set
+          Puppet.debug "Host #{host} is available for replset #{status['set']}"
+          alive.push(member)
+        elsif status.key?('info')
+          Puppet.debug "Host #{host} is alive but unconfigured: #{status['info']}"
+          alive.push(member)
+        end
+      rescue Puppet::ExecutionFailure => e
+        raise Puppet::Error, "Can't configure replicaset #{name}, host #{host} is not supposed to be part of a replicaset." if e.message =~ %r{not running with --replSet}
+
+        if auth_enabled && (e.message.include?('unauthorized') || e.message.include?('not authorized') || e.message.include?('requires authentication'))
+          Puppet.warning "Host #{host} is available, but you are unauthorized because of authentication is enabled: #{auth_enabled}"
+          alive.push(member)
+        elsif e.message.include?('no replset config has been received')
+          Puppet.debug 'Mongo v4 rs.status() RS not initialized output'
+          alive.push(member)
+        else
+          Puppet.warning "Can't connect to replicaset member #{host}."
+        end
       end
-    rescue Puppet::ExecutionFailure
-      Puppet.warning "Can't connect to replicaset member #{host}."
     end
     alive.uniq!
     dead = members - alive
@@ -383,7 +384,7 @@ def mongo_command(command, host, retries = 4)
 
   def self.mongo_command(command, host = nil, retries = 4)
     begin
-      output = mongo_eval("printjson(#{command})", 'admin', retries, host)
+      output = mongo_eval("EJSON.stringify(#{command})", 'admin', retries, host)
     rescue Puppet::ExecutionFailure => e
       Puppet.debug "Got an exception: #{e}"
       raise
diff --git a/lib/puppet/provider/mongodb_shard/mongo.rb b/lib/puppet/provider/mongodb_shard/mongo.rb
index 283d6cce2..6347bf59b 100644
--- a/lib/puppet/provider/mongodb_shard/mongo.rb
+++ b/lib/puppet/provider/mongodb_shard/mongo.rb
@@ -13,7 +13,7 @@
 
   mk_resource_methods
 
-  commands mongo: 'mongo'
+  commands mongosh: 'mongosh'
 
   def initialize(value = {})
     super(value)
@@ -152,8 +152,8 @@ def self.mongo_command(command, host = nil, _retries = 4)
       args = []
       args << '--quiet'
       args << ['--host', host] if host
-      args << ['--eval', "printjson(#{command})"]
-      output = mongo(args.flatten)
+      args << ['--eval', "EJSON.stringify(#{command})"]
+      output = mongosh(args.flatten)
     rescue Puppet::ExecutionFailure => e
       raise unless e =~ %r{Error: couldn't connect to server} && wait <= (2**max_wait)
 
diff --git a/lib/puppet/provider/mongodb_user/mongodb.rb b/lib/puppet/provider/mongodb_user/mongodb.rb
index d9db0fa45..7eeb79eba 100644
--- a/lib/puppet/provider/mongodb_user/mongodb.rb
+++ b/lib/puppet/provider/mongodb_user/mongodb.rb
@@ -10,13 +10,12 @@ def self.instances
     require 'json'
 
     if db_ismaster
-      script = 'printjson(db.system.users.find().toArray())'
+      script = 'EJSON.stringify(db.system.users.find().toArray())'
       # A hack to prevent prefetching failures until admin user is created
-      script = "try {#{script}} catch (e) { if (e.message.match(/not authorized on admin/)) { 'not authorized on admin' } else {throw e}}" if auth_enabled
+      script = "try {#{script}} catch (e) { if (e.message.match(/requires authentication/) || e.message.match(/not authorized on admin/)) { 'not authorized on admin' } else {throw e}}" if auth_enabled
 
       out = mongo_eval(script)
-
-      return [] if auth_enabled && out.include?('not authorized on admin')
+      return [] if auth_enabled && (out.include?('requires authentication') || out.include?('not authorized on admin'))
 
       users = JSON.parse out
 
diff --git a/manifests/client/params.pp b/manifests/client/params.pp
index 554345997..4207921c9 100644
--- a/manifests/client/params.pp
+++ b/manifests/client/params.pp
@@ -3,16 +3,10 @@
 # @api private
 #
 class mongodb::client::params inherits mongodb::globals {
-  $package_ensure = pick($mongodb::globals::version, 'present')
+  $package_ensure = pick($mongodb::globals::client_version, 'present')
   $manage_package = pick($mongodb::globals::manage_package, $mongodb::globals::manage_package_repo, false)
 
-  if $manage_package {
-    $package_name = "mongodb-${mongodb::globals::edition}-shell"
-  } else {
-    $package_name = $facts['os']['family'] ? {
-      'Debian' => 'mongodb-clients',
-      'Redhat' => "mongodb-${mongodb::globals::edition}-shell",
-      default  => 'mongodb',
-    }
-  }
+  # the new mongosh package is the same for all distros.
+  # and it follows its own versioning
+  $package_name = 'mongodb-mongosh'
 }
diff --git a/manifests/globals.pp b/manifests/globals.pp
index 6e32eb432..191207f3c 100644
--- a/manifests/globals.pp
+++ b/manifests/globals.pp
@@ -36,6 +36,8 @@
 #   This setting can be used to specify the name of the client package that should be installed.
 #   If not specified, the module will use whatever service name is the default for your OS distro.
 #
+# @param client_version
+#   Version of the client package to install.
 # @param mongod_service_manage
 #   This setting can be used to override the default management of the mongod service.
 #   By default the module will manage the mongod process.
@@ -118,6 +120,7 @@
 class mongodb::globals (
   $server_package_name         = undef,
   $client_package_name         = undef,
+  $client_version              = undef,
 
   $mongod_service_manage       = undef,
   $service_enable              = undef,
diff --git a/manifests/params.pp b/manifests/params.pp
index 18aab19b9..552b810dd 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -22,7 +22,7 @@
   ]
   $handle_creds          = true
   $store_creds           = false
-  $rcfile                = "${facts['root_home']}/.mongorc.js"
+  $rcfile                = "${facts['root_home']}/.mongoshrc.js"
   $dbpath_fix            = false
 
   $manage_package        = pick($mongodb::globals::manage_package, $mongodb::globals::manage_package_repo, false)
diff --git a/manifests/server/config.pp b/manifests/server/config.pp
index 289cefe29..f4f1531fd 100644
--- a/manifests/server/config.pp
+++ b/manifests/server/config.pp
@@ -179,7 +179,7 @@
   if $handle_creds {
     file { $rcfile:
       ensure  => file,
-      content => template('mongodb/mongorc.js.erb'),
+      content => template('mongodb/mongoshrc.js.erb'),
       owner   => 'root',
       group   => 'root',
       mode    => '0600',
diff --git a/spec/acceptance/database_spec.rb b/spec/acceptance/database_spec.rb
index 100c21892..023f40fa0 100644
--- a/spec/acceptance/database_spec.rb
+++ b/spec/acceptance/database_spec.rb
@@ -23,8 +23,8 @@ class { 'mongodb::server': }
       end
 
       it 'creates the databases' do
-        shell("mongo testdb1 --eval 'printjson(db.getMongo().getDBs())'")
-        shell("mongo testdb2 --eval 'printjson(db.getMongo().getDBs())'")
+        shell("mongosh testdb1 --eval 'EJSON.stringify(db.getMongo().getDBs())'")
+        shell("mongosh testdb2 --eval 'EJSON.stringify(db.getMongo().getDBs())'")
       end
     end
 
@@ -50,8 +50,8 @@ class { 'mongodb::server':
       end
 
       it 'creates the database' do
-        shell("mongo testdb1 --port 27018 --eval 'printjson(db.getMongo().getDBs())'")
-        shell("mongo testdb2 --port 27018 --eval 'printjson(db.getMongo().getDBs())'")
+        shell("mongosh testdb1 --port 27018 --eval 'EJSON.stringify(db.getMongo().getDBs())'")
+        shell("mongosh testdb2 --port 27018 --eval 'EJSON.stringify(db.getMongo().getDBs())'")
       end
     end
   end
diff --git a/spec/acceptance/mongos_spec.rb b/spec/acceptance/mongos_spec.rb
index b1839027d..2d821aceb 100644
--- a/spec/acceptance/mongos_spec.rb
+++ b/spec/acceptance/mongos_spec.rb
@@ -46,7 +46,7 @@ class { 'mongodb::server':
       it { is_expected.to be_listening }
     end
 
-    describe command('mongo --version') do
+    describe command('mongod --version') do
       its(:exit_status) { is_expected.to eq 0 }
     end
   end
diff --git a/spec/acceptance/replset_spec.rb b/spec/acceptance/replset_spec.rb
index 97f9c9bc9..954138378 100644
--- a/spec/acceptance/replset_spec.rb
+++ b/spec/acceptance/replset_spec.rb
@@ -6,7 +6,7 @@
   describe 'mongodb_replset resource' do
     after :all do
       # Have to drop the DB to disable replsets for further testing
-      on hosts, %{mongo local --verbose --eval 'db.dropDatabase()'}
+      on hosts, %{mongosh local --verbose --eval 'db.dropDatabase()'}
 
       pp = <<-EOS
         class { 'mongodb::globals': }
@@ -48,7 +48,7 @@ class { 'mongodb::client': }
         }
       EOS
       apply_manifest_on(hosts_as('master'), pp, catch_failures: true)
-      on(hosts_as('master'), 'mongo --quiet --eval "printjson(rs.conf())"') do |r|
+      on(hosts_as('master'), 'mongosh --quiet --eval "EJSON.stringify(rs.conf())"') do |r|
         expect(r.stdout).to match %r{#{hosts[0]}:27017}
         expect(r.stdout).to match %r{#{hosts[1]}:27017}
       end
@@ -56,18 +56,18 @@ class { 'mongodb::client': }
 
     it 'inserts data on the master' do
       sleep(30)
-      on hosts_as('master'), %{mongo --verbose --eval 'db.test.save({name:"test1",value:"some value"})'}
+      on hosts_as('master'), %{mongosh --verbose --eval 'db.test.save({name:"test1",value:"some value"})'}
     end
 
     it 'checks the data on the master' do
-      on hosts_as('master'), %{mongo --verbose --eval 'printjson(db.test.findOne({name:"test1"}))'} do |r|
+      on hosts_as('master'), %{mongosh --verbose --eval 'EJSON.stringify(db.test.findOne({name:"test1"}))'} do |r|
         expect(r.stdout).to match %r{some value}
       end
     end
 
     it 'checks the data on the slave' do
       sleep(10)
-      on hosts_as('slave'), %{mongo --verbose --eval 'try { rs.secondaryOk() } catch (err) { rs.slaveOk() }; printjson(db.test.findOne({name:"test1"}))'} do |r|
+      on hosts_as('slave'), %{mongosh --verbose --eval 'db.getMongo().setReadPref("primaryPreferred"); EJSON.stringify(db.test.findOne({name:"test1"}))'} do |r|
         expect(r.stdout).to match %r{some value}
       end
     end
@@ -76,7 +76,7 @@ class { 'mongodb::client': }
   describe 'mongodb_replset resource with auth => true' do
     after :all do
       # Have to drop the DB to disable replsets for further testing
-      on hosts, %{mongo local --verbose --eval 'db.dropDatabase()'}
+      on hosts, %{mongosh local --verbose --eval 'db.dropDatabase()'}
 
       pp = <<-EOS
         class { 'mongodb::globals': }
@@ -177,7 +177,7 @@ class { 'mongodb::server':
       EOS
       apply_manifest_on(hosts_as('master'), pp, catch_failures: true)
       apply_manifest_on(hosts_as('master'), pp, catch_changes: true)
-      on(hosts_as('master'), 'mongo --quiet --eval "load(\'/root/.mongorc.js\');printjson(rs.conf())"') do |r|
+      on(hosts_as('master'), 'mongosh --quiet --eval "load(\'/root/.mongoshrc.js\');EJSON.stringify(rs.conf())"') do |r|
         expect(r.stdout).to match %r{#{hosts[0]}:27017}
         expect(r.stdout).to match %r{#{hosts[1]}:27017}
       end
@@ -185,18 +185,18 @@ class { 'mongodb::server':
 
     it 'inserts data on the master' do
       sleep(30)
-      on hosts_as('master'), %{mongo test --verbose --eval 'load("/root/.mongorc.js");db.dummyData.insert({"created_by_puppet": 1})'}
+      on hosts_as('master'), %{mongosh test --verbose --eval 'load("/root/.mongoshrc.js");db.dummyData.insert({"created_by_puppet": 1})'}
     end
 
     it 'checks the data on the master' do
-      on hosts_as('master'), %{mongo test --verbose --eval 'load("/root/.mongorc.js");printjson(db.dummyData.findOne())'} do |r|
+      on hosts_as('master'), %{mongosh test --verbose --eval 'load("/root/.mongoshrc.js");EJSON.stringify(db.dummyData.findOne())'} do |r|
         expect(r.stdout).to match %r{created_by_puppet}
       end
     end
 
     it 'checks the data on the slave' do
       sleep(10)
-      on hosts_as('slave'), %{mongo test --verbose --eval 'load("/root/.mongorc.js");try { rs.secondaryOk() } catch (err) { rs.slaveOk() };printjson(db.dummyData.findOne())'} do |r|
+      on hosts_as('slave'), %{mongosh test --verbose --eval 'load("/root/.mongoshrc.js");db.getMongo().setReadPref("primaryPreferred");EJSON.stringify(db.dummyData.findOne())'} do |r|
         expect(r.stdout).to match %r{created_by_puppet}
       end
     end
diff --git a/spec/acceptance/server_spec.rb b/spec/acceptance/server_spec.rb
index 2609d2423..9ad85a906 100644
--- a/spec/acceptance/server_spec.rb
+++ b/spec/acceptance/server_spec.rb
@@ -35,7 +35,7 @@ class { 'mongodb::server': }
       it { is_expected.to be_listening }
     end
 
-    describe command('mongo --version') do
+    describe command('mongod --version') do
       its(:exit_status) { is_expected.to eq 0 }
     end
   end
@@ -120,11 +120,11 @@ class { 'mongodb::client': }
       it { is_expected.to be_listening }
     end
 
-    describe command('mongo --quiet --eval "db.serverCmdLineOpts().code"') do
-      its(:stdout) { is_expected.to match '13' }
+    describe command('mongosh --quiet --eval "db.serverCmdLineOpts().ok"') do
+      its(:stderr) { is_expected.to match %r{requires authentication} }
     end
 
-    describe file('/root/.mongorc.js') do
+    describe file('/root/.mongoshrc.js') do
       it { is_expected.to be_file }
       it { is_expected.to be_owned_by 'root' }
       it { is_expected.to be_grouped_into 'root' }
@@ -132,12 +132,12 @@ class { 'mongodb::client': }
       it { is_expected.to contain 'db.auth(\'admin\', \'password\')' }
     end
 
-    describe command("mongo admin --quiet --eval \"load('/root/.mongorc.js');printjson(db.getUser('admin')['customData'])\"") do
+    describe command("mongosh admin --quiet --eval \"load('/root/.mongoshrc.js');EJSON.stringify(db.getUser('admin')['customData'])\"") do
       its(:exit_status) { is_expected.to eq 0 }
-      its(:stdout) { is_expected.to match "{ \"createdBy\" : \"Puppet Mongodb_user['User admin on db admin']\" }\n" }
+      its(:stdout) { is_expected.to match "{\"createdBy\":\"Puppet Mongodb_user['User admin on db admin']\"}\n" }
     end
 
-    describe command('mongo --version') do
+    describe command('mongod --version') do
       its(:exit_status) { is_expected.to eq 0 }
     end
   end
diff --git a/spec/acceptance/sharding_spec.rb b/spec/acceptance/sharding_spec.rb
index d659c1eb6..ea8815ebc 100644
--- a/spec/acceptance/sharding_spec.rb
+++ b/spec/acceptance/sharding_spec.rb
@@ -46,7 +46,7 @@ class { 'mongodb::client': }
       EOS
 
       apply_manifest_on(hosts_as('router'), pp, catch_failures: true)
-      on(hosts_as('router'), 'mongo --quiet --eval "printjson(sh.status())"') do |r|
+      on(hosts_as('router'), 'mongosh --quiet --eval "EJSON.stringify(sh.status())"') do |r|
         expect(r.stdout).to match %r{foo/shard:27018}
         expect(r.stdout).to match %r{foo\.toto}
       end
diff --git a/spec/acceptance/user_spec.rb b/spec/acceptance/user_spec.rb
index ee119561f..51df5ef67 100644
--- a/spec/acceptance/user_spec.rb
+++ b/spec/acceptance/user_spec.rb
@@ -22,8 +22,8 @@ class { 'mongodb::server': }
     end
 
     it 'creates the user' do
-      shell("mongo testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
-        expect(r.stdout.chomp).to eq('1')
+      shell("mongosh testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
+        expect(r.stdout.chomp).to eq('{ ok: 1 }')
       end
     end
 
@@ -45,8 +45,8 @@ class { 'mongodb::server': }
     end
 
     it 'auth should fail' do
-      shell("mongo testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
-        expect(r.stdout.chomp).to contain('Error: Authentication failed')
+      shell("mongosh testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
+        expect(r.stderr.chomp).to match(%r{MongoServerError: Authentication failed})
       end
     end
   end
@@ -70,8 +70,8 @@ class { 'mongodb::server': port => 27018 }
     end
 
     it 'creates the user' do
-      shell("mongo testdb --quiet --port 27018 --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
-        expect(r.stdout.chomp).to eq('1')
+      shell("mongosh testdb --quiet --port 27018 --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
+        expect(r.stdout.chomp).to eq('{ ok: 1 }')
       end
     end
   end
@@ -96,8 +96,8 @@ class { 'mongodb::server': }
     end
 
     it 'creates the user' do
-      shell("mongo testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
-        expect(r.stdout.chomp).to eq('1')
+      shell("mongosh testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
+        expect(r.stdout.chomp).to eq('{ ok: 1 }')
       end
     end
   end
@@ -130,25 +130,25 @@ class { 'mongodb::server': }
     end
 
     it 'allows the testuser' do
-      shell("mongo testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
-        expect(r.stdout.chomp).to eq('1')
+      shell("mongosh testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\")'") do |r|
+        expect(r.stdout.chomp).to eq('{ ok: 1 }')
       end
     end
 
     it 'assigns roles to testuser' do
-      shell("mongo testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\"); db.getUser(\"testuser\")[\"roles\"].forEach(function(role){print(role.role + \"@\" + role.db)})'") do |r|
+      shell("mongosh testdb --quiet --eval 'db.auth(\"testuser\",\"passw0rd\"); db.getUser(\"testuser\")[\"roles\"].forEach(function(role){print(role.role + \"@\" + role.db)})'") do |r|
         expect(r.stdout.split(%r{\n})).to contain_exactly('readWrite@testdb', 'dbAdmin@testdb')
       end
     end
 
     it 'allows the second user to connect to its default database' do
-      shell("mongo testdb2 --quiet --eval 'db.auth(\"testuser2\",\"passw0rd\")'") do |r|
-        expect(r.stdout.chomp).to eq('1')
+      shell("mongosh testdb2 --quiet --eval 'db.auth(\"testuser2\",\"passw0rd\")'") do |r|
+        expect(r.stdout.chomp).to eq('{ ok: 1 }')
       end
     end
 
     it 'assigns roles to testuser2' do
-      shell("mongo testdb2 --quiet --eval 'db.auth(\"testuser2\",\"passw0rd\"); db.getUser(\"testuser2\")[\"roles\"].forEach(function(role){print(role.role + \"@\" + role.db)})'") do |r|
+      shell("mongosh testdb2 --quiet --eval 'db.auth(\"testuser2\",\"passw0rd\"); db.getUser(\"testuser2\")[\"roles\"].forEach(function(role){print(role.role + \"@\" + role.db)})'") do |r|
         expect(r.stdout.split(%r{\n})).to contain_exactly('readWrite@testdb2', 'dbAdmin@testdb2', 'readWrite@testdb', 'dbAdmin@testdb')
       end
     end
diff --git a/spec/classes/client_spec.rb b/spec/classes/client_spec.rb
index c8574b05c..09381ba3b 100644
--- a/spec/classes/client_spec.rb
+++ b/spec/classes/client_spec.rb
@@ -9,7 +9,7 @@
 
       context 'with defaults' do
         it { is_expected.to compile.with_all_deps }
-        it { is_expected.to create_package('mongodb_client').with_ensure('present').with_name('mongodb-org-shell').with_tag('mongodb_package') }
+        it { is_expected.to create_package('mongodb_client').with_ensure('present').with_name('mongodb-mongosh').with_tag('mongodb_package') }
       end
 
       context 'with manage_package_repo set to false' do
diff --git a/spec/classes/server_spec.rb b/spec/classes/server_spec.rb
index 6318601ac..c2801743b 100644
--- a/spec/classes/server_spec.rb
+++ b/spec/classes/server_spec.rb
@@ -56,7 +56,7 @@
           it { is_expected.to contain_file(config_file).with_content(%r{^  fork: true$}) }
         end
 
-        it { is_expected.to contain_file('/root/.mongorc.js').with_ensure('file').without_content(%r{db\.auth}) }
+        it { is_expected.to contain_file('/root/.mongoshrc.js').with_ensure('file').without_content(%r{db\.auth}) }
         it { is_expected.not_to contain_exec('fix dbpath permissions') }
       end
 
@@ -173,7 +173,7 @@
         end
 
         it { is_expected.to contain_file(config_file).with_content(%r{^security\.authorization: enabled$}) }
-        it { is_expected.to contain_file('/root/.mongorc.js') }
+        it { is_expected.to contain_file('/root/.mongoshrc.js') }
       end
 
       describe 'when specifying set_parameter array value' do
@@ -270,7 +270,7 @@
           end
 
           it {
-            is_expected.to contain_file('/root/.mongorc.js').
+            is_expected.to contain_file('/root/.mongoshrc.js').
               with_ensure('file').
               with_owner('root').
               with_group('root').
@@ -286,7 +286,7 @@
             }
           end
 
-          it { is_expected.to contain_file('/root/.mongorc.js').with_ensure('file').without_content(%r{db\.auth}) }
+          it { is_expected.to contain_file('/root/.mongoshrc.js').with_ensure('file').without_content(%r{db\.auth}) }
         end
       end
 
diff --git a/spec/unit/puppet/provider/mongodb_database/mongodb_spec.rb b/spec/unit/puppet/provider/mongodb_database/mongodb_spec.rb
index c783d6898..8f25fb384 100644
--- a/spec/unit/puppet/provider/mongodb_database/mongodb_spec.rb
+++ b/spec/unit/puppet/provider/mongodb_database/mongodb_spec.rb
@@ -38,7 +38,7 @@
     tmp = Tempfile.new('test')
     mongodconffile = tmp.path
     allow(provider.class).to receive(:mongod_conf_file).and_return(mongodconffile)
-    allow(provider.class).to receive(:mongo_eval).with('try { rs.secondaryOk() } catch (err) { rs.slaveOk() };printjson(db.getMongo().getDBs())').and_return(raw_dbs)
+    allow(provider.class).to receive(:mongo_eval).with('db.getMongo().setReadPref("primaryPreferred");EJSON.stringify(db.getMongo().getDBs())').and_return(raw_dbs)
     allow(provider.class).to receive(:db_ismaster).and_return(true)
   end
 
diff --git a/spec/unit/puppet/provider/mongodb_replset/mongodb_spec.rb b/spec/unit/puppet/provider/mongodb_replset/mongodb_spec.rb
index 1a7872845..2b6b2c825 100644
--- a/spec/unit/puppet/provider/mongodb_replset/mongodb_spec.rb
+++ b/spec/unit/puppet/provider/mongodb_replset/mongodb_spec.rb
@@ -166,7 +166,7 @@
     end
 
     it 'raises an error when at least one member is not running with --replSet' do
-      allow(provider).to receive(:rs_status).and_return('ok' => 0, 'errmsg' => 'not running with --replSet')
+      allow(provider).to receive(:rs_status).and_raise(Puppet::ExecutionFailure, 'MongoServerError: not running with --replSet')
       provider.members = valid_members
       expect { provider.flush }.to raise_error(Puppet::Error, %r{is not supposed to be part of a replicaset\.$})
     end
diff --git a/spec/unit/puppet/provider/mongodb_user/mongodb_spec.rb b/spec/unit/puppet/provider/mongodb_user/mongodb_spec.rb
index 9f77872f0..7f74adf5d 100644
--- a/spec/unit/puppet/provider/mongodb_user/mongodb_spec.rb
+++ b/spec/unit/puppet/provider/mongodb_user/mongodb_spec.rb
@@ -59,7 +59,7 @@
     tmp = Tempfile.new('test')
     mongodconffile = tmp.path
     allow(provider.class).to receive(:mongod_conf_file).and_return(mongodconffile)
-    allow(provider.class).to receive(:mongo_eval).with('printjson(db.system.users.find().toArray())').and_return(raw_users)
+    allow(provider.class).to receive(:mongo_eval).with('EJSON.stringify(db.system.users.find().toArray())').and_return(raw_users)
     allow(provider.class).to receive(:mongo_version).and_return('4.4.0')
     allow(provider.class).to receive(:db_ismaster).and_return(true)
   end
diff --git a/templates/mongorc.js.erb b/templates/mongoshrc.js.erb
similarity index 54%
rename from templates/mongorc.js.erb
rename to templates/mongoshrc.js.erb
index 9e060306f..8cf68f0fa 100644
--- a/templates/mongorc.js.erb
+++ b/templates/mongoshrc.js.erb
@@ -19,31 +19,32 @@ function rsReconfigSettings(settings){
 <% if @auth and @store_creds -%>
 function authRequired() {
   try {
-    return db.serverCmdLineOpts().code == 13;
+    return db.serverCmdLineOpts().ok != 1;
   } catch (err) {
-    return false;
+    if (err.message.match(/requires authentication/) || err.message.match(/not authorized on admin/)) {
+      return true
+    } else {
+      throw("Unknown error :" + err)
+    }
   }
 }
 
 if (authRequired()) {
   <%- if @replset -%>
-  // rs.slaveOk has been deprecated, use secondaryOk if available
-  try {
-    rs.secondaryOk()
-  }
-  catch (err) {
-    rs.slaveOk()
-  }
+  db.getMongo().setReadPref('primaryPreferred')
   <%- end -%>
   try {
-    var prev_db = db
+    var prev_db = db.getName()
     db = db.getSiblingDB('admin')
     db.auth('<%= @admin_username %>', '<%= @admin_password_unsensitive %>')
     db = db.getSiblingDB(prev_db)
   }
   catch (err) {
-    // This isn't catching authentication errors as I'd expect...
-    abort('Unknown error')
+    // Silently ignore this error, we can't really do anything about it.
+    // If authentication fails here, that can mean 2 things:
+    // - Some error or corruption
+    // - Authentication is required, but no user is set up yet.
+    //   This is normal when setting up a new cluster/server.
   }
 }
 <% end -%>