diff --git a/proxy/beforerequest_test.go b/proxy/beforerequest_test.go
index 19acc6870..c8426342e 100644
--- a/proxy/beforerequest_test.go
+++ b/proxy/beforerequest_test.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/AdguardTeam/dnsproxy/upstream"
 	"github.com/AdguardTeam/golibs/errors"
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
@@ -52,6 +53,7 @@ func TestProxy_HandleDNSRequest_beforeRequestHandler(t *testing.T) {
 	errorResponse := (&dns.Msg{}).SetReply(errorRequest)
 
 	p := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: &UpstreamConfig{
 			Upstreams: []upstream.Upstream{&fakeUpstream{
diff --git a/proxy/bogusnxdomain_test.go b/proxy/bogusnxdomain_test.go
index b54500807..ff45845dc 100644
--- a/proxy/bogusnxdomain_test.go
+++ b/proxy/bogusnxdomain_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"github.com/AdguardTeam/dnsproxy/upstream"
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/assert"
@@ -15,6 +16,7 @@ import (
 
 func TestProxy_IsBogusNXDomain(t *testing.T) {
 	prx := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
diff --git a/proxy/cache_test.go b/proxy/cache_test.go
index 34dae394d..bc6260a61 100644
--- a/proxy/cache_test.go
+++ b/proxy/cache_test.go
@@ -32,6 +32,7 @@ var upstreamWithAddr = &fakeUpstream{
 
 func TestServeCached(t *testing.T) {
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -288,6 +289,7 @@ func TestCacheExpiration(t *testing.T) {
 	t.Parallel()
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -347,6 +349,7 @@ func TestCacheExpirationWithTTLOverride(t *testing.T) {
 	u := testUpstream{}
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: &UpstreamConfig{
diff --git a/proxy/dns64_test.go b/proxy/dns64_test.go
index c5605ffb2..8f6d0bb10 100644
--- a/proxy/dns64_test.go
+++ b/proxy/dns64_test.go
@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"github.com/AdguardTeam/dnsproxy/upstream"
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
@@ -38,6 +39,7 @@ func TestDNS64Race(t *testing.T) {
 	}
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:         slogutil.NewDiscardLogger(),
 		UDPListenAddr:  []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:  []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		PrivateSubnets: netutil.SubnetSetFunc(netutil.IsLocallyServed),
@@ -355,6 +357,7 @@ func TestProxy_Resolve_dns64(t *testing.T) {
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			p := mustNew(t, &Config{
+				Logger:        slogutil.NewDiscardLogger(),
 				UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 				TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 				UpstreamConfig: &UpstreamConfig{
diff --git a/proxy/exchange_internal_test.go b/proxy/exchange_internal_test.go
index 8d8805b6f..8cb2c5efa 100644
--- a/proxy/exchange_internal_test.go
+++ b/proxy/exchange_internal_test.go
@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/AdguardTeam/dnsproxy/upstream"
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/assert"
@@ -215,6 +216,7 @@ func TestProxy_Exchange_loadBalance(t *testing.T) {
 		}
 
 		p := mustNew(t, &Config{
+			Logger:        slogutil.NewDiscardLogger(),
 			UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 			TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 			UpstreamConfig: &UpstreamConfig{
diff --git a/proxy/handler_test.go b/proxy/handler_test.go
index 40756e5cd..8232a40eb 100644
--- a/proxy/handler_test.go
+++ b/proxy/handler_test.go
@@ -6,6 +6,7 @@ import (
 	"sync"
 	"testing"
 
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/assert"
@@ -19,6 +20,7 @@ func TestFilteringHandler(t *testing.T) {
 
 	// Prepare the proxy server
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
diff --git a/proxy/lookup_test.go b/proxy/lookup_test.go
index cbe7f0acd..f011f0074 100644
--- a/proxy/lookup_test.go
+++ b/proxy/lookup_test.go
@@ -23,6 +23,7 @@ func TestLookupNetIP(t *testing.T) {
 	require.NoError(t, err)
 
 	conf := &Config{
+		Logger: slogutil.NewDiscardLogger(),
 		UpstreamConfig: &UpstreamConfig{
 			Upstreams: []upstream.Upstream{dnsUpstream},
 		},
diff --git a/proxy/proxy_test.go b/proxy/proxy_test.go
index ce7290665..e380e5dff 100644
--- a/proxy/proxy_test.go
+++ b/proxy/proxy_test.go
@@ -261,6 +261,7 @@ func mustStartDefaultProxy(t *testing.T) (p *Proxy) {
 	t.Helper()
 
 	p = mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -288,6 +289,7 @@ func TestProxyRace(t *testing.T) {
 		testDefaultUpstreamAddr,
 	)
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         upsConf,
@@ -487,6 +489,7 @@ func TestProxy_Resolve_dnssecCache(t *testing.T) {
 	}
 
 	p := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         &UpstreamConfig{Upstreams: []upstream.Upstream{u}},
@@ -583,6 +586,7 @@ func TestExchangeWithReservedDomains(t *testing.T) {
 	t.Parallel()
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: newTestUpstreamConfigWithBoot(
@@ -652,6 +656,7 @@ func TestOneByOneUpstreamsExchange(t *testing.T) {
 	t.Parallel()
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: newTestUpstreamConfigWithBoot(
@@ -745,6 +750,7 @@ func TestFallback(t *testing.T) {
 	}).String()
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: newTestUpstreamConfig(
@@ -842,6 +848,7 @@ func TestFallbackFromInvalidBootstrap(t *testing.T) {
 	require.NoError(t, err)
 
 	dnsProxy := mustNew(t, &Config{
+		Logger:         slogutil.NewDiscardLogger(),
 		UDPListenAddr:  []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:  []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: upsConf,
@@ -883,6 +890,7 @@ func TestFallbackFromInvalidBootstrap(t *testing.T) {
 
 func TestRefuseAny(t *testing.T) {
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -921,6 +929,7 @@ func TestRefuseAny(t *testing.T) {
 
 func TestInvalidDNSRequest(t *testing.T) {
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -1093,6 +1102,7 @@ func TestExchangeCustomUpstreamConfig(t *testing.T) {
 
 func TestExchangeCustomUpstreamConfigCache(t *testing.T) {
 	prx := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -1224,6 +1234,7 @@ func TestECSProxy(t *testing.T) {
 	}
 
 	prx := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr: []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: &UpstreamConfig{
@@ -1333,6 +1344,7 @@ func TestECSProxyCacheMinMaxTTL(t *testing.T) {
 	}
 
 	prx := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         &UpstreamConfig{Upstreams: []upstream.Upstream{u}},
@@ -1576,6 +1588,7 @@ func TestProxy_HandleDNSRequest_private(t *testing.T) {
 	}
 
 	p := mustNew(t, &Config{
+		Logger:        slogutil.NewDiscardLogger(),
 		UDPListenAddr: []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig: &UpstreamConfig{
 			Upstreams: []upstream.Upstream{generalUps},
diff --git a/proxy/ratelimit_test.go b/proxy/ratelimit_test.go
index 975404391..5bea0c409 100644
--- a/proxy/ratelimit_test.go
+++ b/proxy/ratelimit_test.go
@@ -6,6 +6,7 @@ import (
 	"net/netip"
 	"testing"
 
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/require"
@@ -13,6 +14,7 @@ import (
 
 func TestRatelimitingProxy(t *testing.T) {
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		UDPListenAddr:          []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TCPListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
diff --git a/proxy/server_dnscrypt_test.go b/proxy/server_dnscrypt_test.go
index e6d3157e1..b8e5b7979 100644
--- a/proxy/server_dnscrypt_test.go
+++ b/proxy/server_dnscrypt_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/ameshkov/dnscrypt/v2"
 	"github.com/ameshkov/dnsstamps"
@@ -14,6 +15,11 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// TODO(d.kolyshev): Remove this after migrating dnscrypt to slog.
+func TestMain(m *testing.M) {
+	testutil.DiscardLogOutput(m)
+}
+
 func getFreePort() uint {
 	l, _ := net.Listen("tcp", "127.0.0.1:0")
 	port := uint(l.Addr().(*net.TCPAddr).Port)
@@ -35,6 +41,7 @@ func createTestDNSCryptProxy(t *testing.T) (*Proxy, dnscrypt.ResolverConfig) {
 
 	port := getFreePort()
 	p := mustNew(t, &Config{
+		Logger: slogutil.NewDiscardLogger(),
 		DNSCryptUDPListenAddr: []*net.UDPAddr{{
 			Port: int(port), IP: net.ParseIP(listenIP),
 		}},
diff --git a/proxy/server_https_test.go b/proxy/server_https_test.go
index 3792baf58..a968d95e4 100644
--- a/proxy/server_https_test.go
+++ b/proxy/server_https_test.go
@@ -39,6 +39,7 @@ func TestHttpsProxy(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			tlsConf, caPem := newTLSConfig(t)
 			dnsProxy := mustNew(t, &Config{
+				Logger:                 slogutil.NewDiscardLogger(),
 				TLSListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 				HTTPSListenAddr:        []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 				QUICListenAddr:         []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
@@ -80,6 +81,7 @@ func TestProxy_trustedProxies(t *testing.T) {
 		// Prepare the proxy server.
 		tlsConf, caPem := newTLSConfig(t)
 		dnsProxy := mustNew(t, &Config{
+			Logger:                 slogutil.NewDiscardLogger(),
 			TLSListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 			HTTPSListenAddr:        []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 			QUICListenAddr:         []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
diff --git a/proxy/server_quic_test.go b/proxy/server_quic_test.go
index d6181a699..1e44ded6c 100644
--- a/proxy/server_quic_test.go
+++ b/proxy/server_quic_test.go
@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/AdguardTeam/dnsproxy/proxyutil"
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
 	"github.com/quic-go/quic-go"
@@ -28,6 +29,7 @@ func TestQuicProxy(t *testing.T) {
 	}
 
 	conf := &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		QUICListenAddr:         []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
 		TLSConfig:              serverConfig,
 		UpstreamConfig:         newTestUpstreamConfig(t, defaultTimeout, testDefaultUpstreamAddr),
@@ -89,6 +91,7 @@ func TestQuicProxy(t *testing.T) {
 func TestQuicProxy_largePackets(t *testing.T) {
 	serverConfig, caPem := newTLSConfig(t)
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		TLSListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		HTTPSListenAddr:        []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		QUICListenAddr:         []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
diff --git a/proxy/server_tcp_test.go b/proxy/server_tcp_test.go
index 1a4240cea..5441766b8 100644
--- a/proxy/server_tcp_test.go
+++ b/proxy/server_tcp_test.go
@@ -7,6 +7,7 @@ import (
 	"net"
 	"testing"
 
+	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/require"
@@ -26,6 +27,7 @@ func TestTcpProxy(t *testing.T) {
 func TestTlsProxy(t *testing.T) {
 	serverConfig, caPem := newTLSConfig(t)
 	dnsProxy := mustNew(t, &Config{
+		Logger:                 slogutil.NewDiscardLogger(),
 		TLSListenAddr:          []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		HTTPSListenAddr:        []*net.TCPAddr{net.TCPAddrFromAddrPort(localhostAnyPort)},
 		QUICListenAddr:         []*net.UDPAddr{net.UDPAddrFromAddrPort(localhostAnyPort)},
diff --git a/upstream/upstream_internal_test.go b/upstream/upstream_internal_test.go
index 78e5d1fe9..e2421a039 100644
--- a/upstream/upstream_internal_test.go
+++ b/upstream/upstream_internal_test.go
@@ -28,6 +28,7 @@ import (
 
 // TODO(ameshkov): Make tests here not depend on external servers.
 
+// TODO(d.kolyshev): Remove this after migrating dnscrypt to slog.
 func TestMain(m *testing.M) {
 	testutil.DiscardLogOutput(m)
 }