diff --git a/api/client.go b/api/client.go
index f7c41f55fc3..a0c5ada069f 100644
--- a/api/client.go
+++ b/api/client.go
@@ -423,7 +423,7 @@ func (c *Client) UploadCharm(curl *charm.URL, content io.ReadSeeker) (*charm.URL
 }
 
 func (c *Client) validateCharmVersion(ch charm.Charm) error {
-	minver := jujuversion.ToVersion2(ch.Meta().MinJujuVersion)
+	minver := ch.Meta().MinJujuVersion
 	if minver != version.Zero {
 		agentver, err := c.AgentVersion()
 		if err != nil {
diff --git a/api/client_test.go b/api/client_test.go
index 60aae47775d..75b23af64bd 100644
--- a/api/client_test.go
+++ b/api/client_test.go
@@ -391,7 +391,7 @@ func testMinVer(client *api.Client, t minverTest, c *gc.C) {
 	curl := charm.MustParseURL(
 		fmt.Sprintf("local:quantal/%s-%d", charmArchive.Meta().Name, charmArchive.Revision()),
 	)
-	charmArchive.Meta().MinJujuVersion = jujuversion.ToVersion1(charmMinVer)
+	charmArchive.Meta().MinJujuVersion = charmMinVer
 
 	_, err := client.AddLocalCharm(curl, charmArchive, t.force)
 
diff --git a/api/common/charms/common.go b/api/common/charms/common.go
index e633cfcea4d..b3ef160f2e0 100644
--- a/api/common/charms/common.go
+++ b/api/common/charms/common.go
@@ -10,7 +10,7 @@ import (
 	"github.com/juju/errors"
 	"github.com/juju/systems"
 	"github.com/juju/systems/channel"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 
 	"github.com/juju/juju/api/base"
 	"github.com/juju/juju/apiserver/params"
diff --git a/api/common/charms/common_test.go b/api/common/charms/common_test.go
index 08b71613d32..a3b999afa63 100644
--- a/api/common/charms/common_test.go
+++ b/api/common/charms/common_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/juju/charm/v9/resource"
 	"github.com/juju/systems"
 	"github.com/juju/systems/channel"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 	gc "gopkg.in/check.v1"
 
 	basemocks "github.com/juju/juju/api/base/mocks"
diff --git a/apiserver/dashboard.go b/apiserver/dashboard.go
index 44261d8476a..0b14179e43c 100644
--- a/apiserver/dashboard.go
+++ b/apiserver/dashboard.go
@@ -19,7 +19,7 @@ import (
 
 	"github.com/gorilla/handlers"
 	"github.com/juju/errors"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 
 	agenttools "github.com/juju/juju/agent/tools"
 	"github.com/juju/juju/apiserver/common/apihttp"
diff --git a/apiserver/dashboard_test.go b/apiserver/dashboard_test.go
index 344c080922b..a35fc4657d8 100644
--- a/apiserver/dashboard_test.go
+++ b/apiserver/dashboard_test.go
@@ -20,7 +20,7 @@ import (
 	"strings"
 
 	jc "github.com/juju/testing/checkers"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 	gc "gopkg.in/check.v1"
 
 	agenttools "github.com/juju/juju/agent/tools"
diff --git a/apiserver/facades/client/application/application.go b/apiserver/facades/client/application/application.go
index 063823528f9..845f3523f69 100644
--- a/apiserver/facades/client/application/application.go
+++ b/apiserver/facades/client/application/application.go
@@ -407,8 +407,7 @@ func caasPrecheck(
 	}
 
 	// For older charms, operator-storage model config is mandatory.
-	minver := ch.Meta().MinJujuVersion
-	if k8s.RequireOperatorStorage(jujuversion.ToVersion2(minver)) {
+	if k8s.RequireOperatorStorage(ch.Meta().MinJujuVersion) {
 		storageClassName, _ := cfg.AllAttrs()[k8sconstants.OperatorStorageKey].(string)
 		if storageClassName == "" {
 			return errors.New(
@@ -486,8 +485,7 @@ func deployApplication(
 		return errors.Trace(err)
 	}
 
-	minver := ch.Meta().MinJujuVersion
-	if err := jujuversion.CheckJujuMinVersion(jujuversion.ToVersion2(minver), jujuversion.Current); err != nil {
+	if err := jujuversion.CheckJujuMinVersion(ch.Meta().MinJujuVersion, jujuversion.Current); err != nil {
 		return errors.Trace(err)
 	}
 
diff --git a/apiserver/facades/client/application/application_unit_test.go b/apiserver/facades/client/application/application_unit_test.go
index bc20d62ef7e..2f220254a17 100644
--- a/apiserver/facades/client/application/application_unit_test.go
+++ b/apiserver/facades/client/application/application_unit_test.go
@@ -1064,7 +1064,7 @@ func (s *ApplicationSuite) TestDeployCAASModelCharmNeedsNoOperatorStorage(c *gc.
 	s.PatchValue(&jujuversion.Current, version.MustParse("2.8-beta1"))
 	s.backend.charm = &mockCharm{
 		meta: &charm.Meta{
-			MinJujuVersion: jujuversion.ToVersion1(version.MustParse("2.8.0")),
+			MinJujuVersion: version.MustParse("2.8.0"),
 		},
 	}
 
diff --git a/apiserver/facades/client/application/charmstore.go b/apiserver/facades/client/application/charmstore.go
index 5001418fe3b..30d8c5f5c67 100644
--- a/apiserver/facades/client/application/charmstore.go
+++ b/apiserver/facades/client/application/charmstore.go
@@ -154,8 +154,7 @@ func AddCharmWithAuthorizationAndRepo(st State, args params.AddCharmWithAuthoriz
 type versionValidator struct{}
 
 func (versionValidator) Validate(meta *charm.Meta) error {
-	minver := meta.MinJujuVersion
-	return jujuversion.CheckJujuMinVersion(jujuversion.ToVersion2(minver), jujuversion.Current)
+	return jujuversion.CheckJujuMinVersion(meta.MinJujuVersion, jujuversion.Current)
 }
 
 type charmStateShim struct {
diff --git a/apiserver/facades/client/charms/client.go b/apiserver/facades/client/charms/client.go
index f5c8d6475f3..68170acaf31 100644
--- a/apiserver/facades/client/charms/client.go
+++ b/apiserver/facades/client/charms/client.go
@@ -424,8 +424,7 @@ func (a *API) addCharmWithAuthorization(args params.AddCharmWithAuth) (params.Ch
 type versionValidator struct{}
 
 func (versionValidator) Validate(meta *charm.Meta) error {
-	minver := meta.MinJujuVersion
-	return jujuversion.CheckJujuMinVersion(jujuversion.ToVersion2(minver), jujuversion.Current)
+	return jujuversion.CheckJujuMinVersion(meta.MinJujuVersion, jujuversion.Current)
 }
 
 // CharmArchive is the data that needs to be stored for a charm archive in
diff --git a/apiserver/facades/client/machinemanager/upgrade_series.go b/apiserver/facades/client/machinemanager/upgrade_series.go
index 0922cbafd43..23e72b6354b 100644
--- a/apiserver/facades/client/machinemanager/upgrade_series.go
+++ b/apiserver/facades/client/machinemanager/upgrade_series.go
@@ -4,6 +4,9 @@
 package machinemanager
 
 import (
+	"context"
+	"fmt"
+
 	"github.com/juju/charm/v9"
 	"github.com/juju/collections/set"
 	"github.com/juju/errors"
diff --git a/apiserver/facades/controller/caasoperatorprovisioner/provisioner.go b/apiserver/facades/controller/caasoperatorprovisioner/provisioner.go
index d2038985934..ccf9bf125d4 100644
--- a/apiserver/facades/controller/caasoperatorprovisioner/provisioner.go
+++ b/apiserver/facades/controller/caasoperatorprovisioner/provisioner.go
@@ -190,8 +190,7 @@ func (a *API) OperatorProvisioningInfo(args params.Entities) (params.OperatorPro
 			result.Results[i].Error = apiservererrors.ServerError(err)
 			continue
 		}
-		minVer := ch.Meta().MinJujuVersion
-		needStorage := provider.RequireOperatorStorage(version.ToVersion2(minVer))
+		needStorage := provider.RequireOperatorStorage(ch.Meta().MinJujuVersion)
 		logger.Debugf("application %s has min-juju-version=%v, so charm storage is %v",
 			appName.String(), ch.Meta().MinJujuVersion, needStorage)
 		result.Results[i] = oneProvisioningInfo(needStorage)
diff --git a/apiserver/facades/controller/caasoperatorprovisioner/provisioner_test.go b/apiserver/facades/controller/caasoperatorprovisioner/provisioner_test.go
index 52592f3284a..081bb76dc71 100644
--- a/apiserver/facades/controller/caasoperatorprovisioner/provisioner_test.go
+++ b/apiserver/facades/controller/caasoperatorprovisioner/provisioner_test.go
@@ -178,7 +178,7 @@ func (s *CAASProvisionerSuite) TestOperatorProvisioningInfoNoStorage(c *gc.C) {
 	s.st.operatorRepo = "somerepo"
 	minVers := version.MustParse("2.8.0")
 	s.st.app = &mockApplication{
-		charm: &mockCharm{meta: &charm.Meta{MinJujuVersion: jujuversion.ToVersion1(minVers)}},
+		charm: &mockCharm{meta: &charm.Meta{MinJujuVersion: minVers}},
 	}
 	result, err := s.api.OperatorProvisioningInfo(params.Entities{Entities: []params.Entity{{"application-gitlab"}}})
 	c.Assert(err, jc.ErrorIsNil)
@@ -199,7 +199,7 @@ func (s *CAASProvisionerSuite) TestOperatorProvisioningInfoNoStoragePool(c *gc.C
 	s.st.operatorRepo = "somerepo"
 	minVers := version.MustParse("2.7.0")
 	s.st.app = &mockApplication{
-		charm: &mockCharm{meta: &charm.Meta{MinJujuVersion: jujuversion.ToVersion1(minVers)}},
+		charm: &mockCharm{meta: &charm.Meta{MinJujuVersion: minVers}},
 	}
 	result, err := s.api.OperatorProvisioningInfo(params.Entities{Entities: []params.Entity{{"application-gitlab"}}})
 	c.Assert(err, jc.ErrorIsNil)
diff --git a/caas/ecs/environ.go b/caas/ecs/environ.go
index 56ef2d37faa..0901f8e7196 100644
--- a/caas/ecs/environ.go
+++ b/caas/ecs/environ.go
@@ -11,14 +11,14 @@ import (
 	jujuclock "github.com/juju/clock"
 	"github.com/juju/errors"
 	"github.com/juju/names/v4"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 
 	"github.com/juju/juju/caas"
 	"github.com/juju/juju/core/annotations"
 	"github.com/juju/juju/core/application"
 	"github.com/juju/juju/core/watcher"
 	"github.com/juju/juju/environs"
-	cloudspec "github.com/juju/juju/environs/cloudspec"
+	"github.com/juju/juju/environs/cloudspec"
 	"github.com/juju/juju/environs/config"
 	envcontext "github.com/juju/juju/environs/context"
 )
diff --git a/caas/kubernetes/provider/cloud_test.go b/caas/kubernetes/provider/cloud_test.go
index 471e9ac29ed..aee83745605 100644
--- a/caas/kubernetes/provider/cloud_test.go
+++ b/caas/kubernetes/provider/cloud_test.go
@@ -15,8 +15,8 @@ import (
 	gc "gopkg.in/check.v1"
 
 	"github.com/juju/juju/caas"
-	k8scloud "github.com/juju/juju/caas/kubernetes/cloud"
 	k8s "github.com/juju/juju/caas/kubernetes"
+	k8scloud "github.com/juju/juju/caas/kubernetes/cloud"
 	"github.com/juju/juju/caas/kubernetes/provider"
 	"github.com/juju/juju/cloud"
 	jujucloud "github.com/juju/juju/cloud"
@@ -168,7 +168,7 @@ func (s *cloudSuite) TestFinalizeCloudMicrok8sAlreadyStorage(c *gc.C) {
 	c.Assert(cloud, jc.DeepEquals, jujucloud.Cloud{
 		Name:            k8s.K8sCloudMicrok8s,
 		Type:            jujucloud.CloudTypeKubernetes,
-		AuthTypes:       k8scloud.SupportedAuthTypes(),,
+		AuthTypes:       k8scloud.SupportedAuthTypes(),
 		CACertificates:  []string{""},
 		Endpoint:        "http://1.1.1.1:8080",
 		HostCloudRegion: fmt.Sprintf("%s/%s", k8s.K8sCloudMicrok8s, k8s.Microk8sRegion),
diff --git a/core/charm/strategies_test.go b/core/charm/strategies_test.go
index 7ece3ddf33c..b3615ce9cdc 100644
--- a/core/charm/strategies_test.go
+++ b/core/charm/strategies_test.go
@@ -13,7 +13,7 @@ import (
 	"github.com/juju/charm/v9"
 	"github.com/juju/testing"
 	jc "github.com/juju/testing/checkers"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 	gc "gopkg.in/check.v1"
 )
 
diff --git a/go.mod b/go.mod
index 3cb25ee9ac6..d13c11fd92d 100644
--- a/go.mod
+++ b/go.mod
@@ -36,7 +36,7 @@ require (
 	github.com/juju/ansiterm v0.0.0-20180109212912-720a0952cc2a
 	github.com/juju/blobstore/v2 v2.0.0-20210302045357-edd2b24570b7
 	github.com/juju/bundlechanges/v5 v5.0.0-20210224113052-f5fb3bbb6c25
-	github.com/juju/charm/v9 v9.0.0-20210309091641-7e600f16b30f
+	github.com/juju/charm/v9 v9.0.0-20210324234318-1204b46e47ee
 	github.com/juju/charmrepo/v7 v7.0.0-20210309083437-272762c450b9
 	github.com/juju/clock v0.0.0-20190205081909-9c5c9712527c
 	github.com/juju/cmd v0.0.0-20200108104440-8e43f3faa5c9
@@ -74,7 +74,6 @@ require (
 	github.com/juju/txn v0.0.0-20210302043154-251cea9e140a
 	github.com/juju/utils v0.0.0-20200604140309-9d78121a29e0
 	github.com/juju/utils/v2 v2.0.0-20200923005554-4646bfea2ef1
-	github.com/juju/version v0.0.0-20191219164919-81c1be00b9a6
 	github.com/juju/version/v2 v2.0.0-20210319015800-dcfac8f4f057
 	github.com/juju/webbrowser v1.0.0
 	github.com/juju/worker/v2 v2.0.0-20200916234526-d6e694f1c54a
diff --git a/go.sum b/go.sum
index ef6d0846c37..36921af0e22 100644
--- a/go.sum
+++ b/go.sum
@@ -397,8 +397,8 @@ github.com/juju/charm/v7 v7.0.0-20200625165032-ef717232a815/go.mod h1:gcqIN/pHfz
 github.com/juju/charm/v8 v8.0.0-20200925053015-07d39c0154ac/go.mod h1:QZwgFXYuJI/PZPnS5feY4/7Ue2v1zm1YtT8rsXHeWCg=
 github.com/juju/charm/v9 v9.0.0-20210125110411-23fabd67cb4c/go.mod h1:ffLfwuA4E426HlTtqgMvKZdBAWXOwbgeeHye/1ITTLc=
 github.com/juju/charm/v9 v9.0.0-20210304052111-31c24cedd783/go.mod h1:82L0Bk5mPMnoGOtP9hsxDumxYWKvjsrFjKiYvte6gP8=
-github.com/juju/charm/v9 v9.0.0-20210309091641-7e600f16b30f h1:zHUKNECfsOIRmQlAYwxj/Rvealq8Jkypy316V4cTag0=
-github.com/juju/charm/v9 v9.0.0-20210309091641-7e600f16b30f/go.mod h1:82L0Bk5mPMnoGOtP9hsxDumxYWKvjsrFjKiYvte6gP8=
+github.com/juju/charm/v9 v9.0.0-20210324234318-1204b46e47ee h1:Sa+juB94sYHtCPAaEQRrckf8xZfLzE+Mhn+dSv4wrxs=
+github.com/juju/charm/v9 v9.0.0-20210324234318-1204b46e47ee/go.mod h1:iMgXKAsiVw2Qd5LvT7GHzJiPpC7V4PacaD3LdAjTmuE=
 github.com/juju/charmrepo/v5 v5.0.0-20200424225329-cddcb4fdcd09/go.mod h1:KJGLR+Nx+PY2hw4EBNAjBWQacWlnxv1oVan1kJ9MlLM=
 github.com/juju/charmrepo/v5 v5.0.0-20200626080438-30e3069e6e8e/go.mod h1:cnwzYYTH1gV7V4ywqBix21av9LhFmdwbFEyE9CwpJ0s=
 github.com/juju/charmrepo/v7 v7.0.0-20210125112315-0c95be42cafc/go.mod h1:R9PTZ6VsweDsg/J2skiWj5ulVpxYPj7JW5IyQxBA4UU=
diff --git a/state/charm.go b/state/charm.go
index e33ca4a3178..6a97a9143e9 100644
--- a/state/charm.go
+++ b/state/charm.go
@@ -678,8 +678,7 @@ func (st *State) AddCharm(info CharmInfo) (stch *Charm, err error) {
 	charms, closer := st.db().GetCollection(charmsC)
 	defer closer()
 
-	minVer := info.Charm.Meta().MinJujuVersion
-	if err := jujuversion.CheckJujuMinVersion(jujuversion.ToVersion2(minVer), jujuversion.Current); err != nil {
+	if err := jujuversion.CheckJujuMinVersion(info.Charm.Meta().MinJujuVersion, jujuversion.Current); err != nil {
 		return nil, errors.Trace(err)
 	}
 	model, err := st.Model()
diff --git a/state/dashboard.go b/state/dashboard.go
index be579776580..0b6d1c65add 100644
--- a/state/dashboard.go
+++ b/state/dashboard.go
@@ -7,7 +7,7 @@ import (
 	"github.com/juju/errors"
 	"github.com/juju/mgo/v2"
 	"github.com/juju/mgo/v2/bson"
-	"github.com/juju/version"
+	"github.com/juju/version/v2"
 )
 
 // dashboardSettingsDoc represents the Juju Dashboard settings in MongoDB.
diff --git a/state/state.go b/state/state.go
index 2f6e41c0488..8a1e6d71394 100644
--- a/state/state.go
+++ b/state/state.go
@@ -1038,8 +1038,7 @@ func (st *State) AddApplication(args AddApplicationArgs) (_ *Application, err er
 		return nil, errors.Errorf("AttachStorage is non-empty but NumUnits is %d, must be 1", args.NumUnits)
 	}
 
-	minver := args.Charm.Meta().MinJujuVersion
-	if err := jujuversion.CheckJujuMinVersion(jujuversion.ToVersion2(minver), jujuversion.Current); err != nil {
+	if err := jujuversion.CheckJujuMinVersion(args.Charm.Meta().MinJujuVersion, jujuversion.Current); err != nil {
 		return nil, errors.Trace(err)
 	}
 
diff --git a/version/version.go b/version/version.go
index 348b773e798..b1452fd5e46 100644
--- a/version/version.go
+++ b/version/version.go
@@ -15,7 +15,6 @@ import (
 	"strings"
 
 	"github.com/juju/errors"
-	semversion1 "github.com/juju/version"
 	semversion "github.com/juju/version/v2"
 )
 
@@ -31,7 +30,7 @@ const UserAgentVersion = "Juju/" + version
 const (
 	// TreeStateDirty when the build was made with a dirty checkout.
 	TreeStateDirty = "dirty"
-	// TreeStateClean when the build was made with a clean checkout.
+	// TreeStateClean when the build was made with a clean checkout.kubernetes/provider/cloud_test.go
 	TreeStateClean = "clean"
 	// TreeStateArchive when the build was made outside of a git checkout.
 	TreeStateArchive = "archive"
@@ -133,31 +132,3 @@ func IsMinVersionError(err error) bool {
 	_, ok := errors.Cause(err).(minJujuVersionErr)
 	return ok
 }
-
-// TODO(juju3) - remove these once juju/charm and juju/description
-// have been updated to use juju/version/v2
-
-// The following are for compatibility with upstream repos that have
-// not yet been updated to use juju/version/v2.
-
-// ToVersion2 converts version number v1 to v2.
-func ToVersion2(v semversion1.Number) semversion.Number {
-	return semversion.Number{
-		Major: v.Major,
-		Minor: v.Minor,
-		Tag:   v.Tag,
-		Patch: v.Patch,
-		Build: v.Build,
-	}
-}
-
-// ToVersion1 converts version number v2 to v1.
-func ToVersion1(v semversion.Number) semversion1.Number {
-	return semversion1.Number{
-		Major: v.Major,
-		Minor: v.Minor,
-		Tag:   v.Tag,
-		Patch: v.Patch,
-		Build: v.Build,
-	}
-}