diff --git a/cmd/omegaup-gitserver/main.go b/cmd/omegaup-gitserver/main.go
index bd70e03..59d36b0 100644
--- a/cmd/omegaup-gitserver/main.go
+++ b/cmd/omegaup-gitserver/main.go
@@ -4,10 +4,12 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"net"
 	"net/http"
 	"net/http/pprof"
 	"os"
 	"os/signal"
+	"path"
 	"strings"
 	"sync"
 	"syscall"
@@ -21,6 +23,9 @@ import (
 	"github.com/omegaup/go-base/v3/logging"
 	"github.com/omegaup/go-base/v3/tracing"
 
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/coreos/go-systemd/v22/daemon"
 	git "github.com/libgit2/git2go/v33"
 	newrelic "github.com/newrelic/go-agent/v3/newrelic"
@@ -68,6 +73,79 @@ func referenceDiscovery(
 	return false
 }
 
+type postUpdateCallback struct {
+	s3c *s3.S3
+	log logging.Logger
+}
+
+func newPostUpdateCallback(s3c *s3.S3, log logging.Logger) githttp.PostUpdateCallback {
+	callback := &postUpdateCallback{
+		s3c: s3c,
+		log: log,
+	}
+	return callback.callback
+}
+
+func (c *postUpdateCallback) callback(
+	ctx context.Context,
+	repo *git.Repository,
+	updatedFiles []string,
+) error {
+	for _, updatedFile := range updatedFiles {
+		if !strings.HasPrefix(updatedFile, "refs/heads/") &&
+			!strings.HasPrefix(updatedFile, "objects/pack/pack-") &&
+			updatedFile != "HEAD" {
+			continue
+		}
+
+		localPath := path.Join(repo.Path(), updatedFile)
+		problemName := path.Base(repo.Path())
+
+		f, err := os.Open(localPath)
+		if err != nil {
+			c.log.Error(
+				"Failed to open file",
+				map[string]any{
+					"path": localPath,
+					"err":  err,
+				},
+			)
+			continue
+		}
+		s, err := f.Stat()
+		if err != nil {
+			c.log.Error(
+				"Failed to stat file",
+				map[string]any{
+					"path": localPath,
+					"err":  err,
+				},
+			)
+			f.Close()
+			continue
+		}
+
+		input := &s3.PutObjectInput{
+			Bucket:        aws.String("omegaup-problems"),
+			Key:           aws.String(path.Join(problemName, updatedFile)),
+			Body:          f,
+			ContentLength: aws.Int64(s.Size()),
+		}
+		_, err = c.s3c.PutObjectWithContext(aws.Context(context.Background()), input)
+		f.Close()
+		if err != nil {
+			c.log.Error(
+				"Failed to put file",
+				map[string]any{
+					"path": localPath,
+					"err":  err,
+				},
+			)
+		}
+	}
+	return nil
+}
+
 type muxGitHandler struct {
 	log            logging.Logger
 	gitHandler     http.Handler
@@ -192,10 +270,36 @@ func main() {
 	lockfileManager := githttp.NewLockfileManager()
 	defer lockfileManager.Clear()
 
+	sess, err := session.NewSession(
+		aws.NewConfig().
+			WithHTTPClient(&http.Client{
+				Timeout: 5 * time.Minute,
+				Transport: &http.Transport{
+					Dial: (&net.Dialer{
+						Timeout:   30 * time.Second,
+						KeepAlive: 30 * time.Second,
+					}).Dial,
+					TLSHandshakeTimeout:   10 * time.Second,
+					ResponseHeaderTimeout: 10 * time.Second,
+					ExpectContinueTimeout: 1 * time.Second,
+				},
+			}).
+			WithLogLevel(aws.LogOff).
+			WithLogger(aws.LoggerFunc(func(args ...any) {
+				log.Debug(fmt.Sprintln(args...), nil)
+			})),
+	)
+	if err != nil {
+		log.Error("aws session", map[string]any{"error": err})
+		os.Exit(1)
+	}
+	s3c := s3.New(sess)
+
 	protocol := gitserver.NewGitProtocol(gitserver.GitProtocolOpts{
 		GitProtocolOpts: githttp.GitProtocolOpts{
 			AuthCallback:               authCallback,
 			ReferenceDiscoveryCallback: referenceDiscovery,
+			PostUpdateCallback:         newPostUpdateCallback(s3c, log),
 			Log:                        log,
 		},
 		AllowDirectPushToMaster:  config.Gitserver.AllowDirectPushToMaster,
diff --git a/go.mod b/go.mod
index 6a39323..2f5e829 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.8
 	github.com/newrelic/go-agent/v3 v3.15.2
 	github.com/o1egl/paseto v1.0.0
-	github.com/omegaup/githttp/v2 v2.4.15
+	github.com/omegaup/githttp/v2 v2.4.16
 	github.com/omegaup/go-base/logging/log15/v3 v3.3.7
 	github.com/omegaup/go-base/tracing/newrelic/v3 v3.3.7
 	github.com/omegaup/go-base/v3 v3.3.7
@@ -17,20 +17,22 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.8.0
 	github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca
-	golang.org/x/crypto v0.0.0-20201208171446-5f87f3452ae9
-	golang.org/x/text v0.3.6
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
+	golang.org/x/text v0.4.0
 )
 
 require (
 	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da // indirect
 	github.com/aead/chacha20poly1305 v0.0.0-20201124145622-1a5aba2a8b29 // indirect
 	github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 // indirect
+	github.com/aws/aws-sdk-go v1.44.134 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.1.1 // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect
 	github.com/go-stack/stack v1.8.1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/inconshreveable/log15 v0.0.0-20201112154412-8562bdadbbac // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
@@ -39,8 +41,8 @@ require (
 	github.com/prometheus/common v0.15.0 // indirect
 	github.com/prometheus/procfs v0.2.0 // indirect
 	golang.org/x/exp v0.0.0-20220916125017-b168a2c6b86b // indirect
-	golang.org/x/net v0.0.0-20211209124913-491a49abca63 // indirect
-	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
+	golang.org/x/net v0.1.0 // indirect
+	golang.org/x/sys v0.1.0 // indirect
 	google.golang.org/genproto v0.0.0-20211223182754-3ac035c7e7cb // indirect
 	google.golang.org/grpc v1.43.0 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
diff --git a/go.sum b/go.sum
index c516c7c..990a5cb 100644
--- a/go.sum
+++ b/go.sum
@@ -28,6 +28,8 @@ github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj
 github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
 github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
 github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.44.134 h1:TzFxjVHPPsibtkD7y6KHI4V00rEKg4yzNlMNGy2ZHeg=
+github.com/aws/aws-sdk-go v1.44.134/go.mod h1:aVsgQcEevwlmQ7qHE9I3h+dtQgpqhFB+i8Phjh7fkwI=
 github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
@@ -170,6 +172,9 @@ github.com/inconshreveable/log15 v0.0.0-20201112154412-8562bdadbbac/go.mod h1:cO
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
+github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
+github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
+github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
@@ -234,6 +239,8 @@ github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQ
 github.com/olekukonko/tablewriter v0.0.0-20170122224234-a0225b3f23b5/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/omegaup/githttp/v2 v2.4.15 h1:Oo3Uv2cYh6qM/izd0q5G8FUekNtDlyOXo5DHwpSXQ9A=
 github.com/omegaup/githttp/v2 v2.4.15/go.mod h1:AT/HZamMpw0BdKFuN4PyWDIvysi0yIAkB9jQyOjJWhQ=
+github.com/omegaup/githttp/v2 v2.4.16 h1:VyBAxaZgbihSW6vCBOPWXkLIVxOy5r27BB3CAmHMuK4=
+github.com/omegaup/githttp/v2 v2.4.16/go.mod h1:AT/HZamMpw0BdKFuN4PyWDIvysi0yIAkB9jQyOjJWhQ=
 github.com/omegaup/go-base/logging/log15 v0.0.0-20211215145412-f1de9d5c6aee h1:pTkTShwDP49l9AAOXGCiyKb7kfwORzs1U4x4ocDCycU=
 github.com/omegaup/go-base/logging/log15 v0.0.0-20211215145412-f1de9d5c6aee/go.mod h1:CdmQRQaKuNhQU7HwaLgalgAUeXwnEoCEhhXN7Ipcyvw=
 github.com/omegaup/go-base/logging/log15/v3 v3.3.7 h1:5CrQc6AWNApSV2YHrn8moZq3cF2E6e0tXXoC95BtNG4=
@@ -334,6 +341,7 @@ github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
@@ -358,6 +366,8 @@ golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20201203163018-be400aefbc4c/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20201208171446-5f87f3452ae9 h1:sYNJzB4J8toYPQTM6pAkcmBRgw9SnQKP9oXCHfgy604=
 golang.org/x/crypto v0.0.0-20201208171446-5f87f3452ae9/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 h1:7I4JAnoQBe7ZtJcBaYHi5UtiO8tQHbUSXxL+pnGRANg=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20220916125017-b168a2c6b86b h1:SCE/18RnFsLrjydh/R/s5EVvHoZprqEQUuoxK8q2Pc4=
 golang.org/x/exp v0.0.0-20220916125017-b168a2c6b86b/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
@@ -368,6 +378,7 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -386,9 +397,13 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20211209124913-491a49abca63 h1:iocB37TsdFuN6IBRZ+ry36wrkoV51/tl5vOWqkcPGvY=
 golang.org/x/net v0.0.0-20211209124913-491a49abca63/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.1.0 h1:hZ/3BUoy5aId7sCpA/Tc5lt8DkFgdVS2onTpJsZ/fl0=
+golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -398,6 +413,7 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -423,19 +439,28 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20201204225414-ed752295db88/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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@@ -450,7 +475,9 @@ golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBn
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@@ -514,6 +541,7 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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