@@ -78,9 +78,9 @@ func TestNewClientWithOpsFromEnv(t *testing.T) {

 		{

 			doc: "override api version",

 			envs: map[string]string{

-				"DOCKER_API_VERSION": "1.22",

+				"DOCKER_API_VERSION": "1.50",

 			},

-			expectedVersion: "1.22",

+			expectedVersion: "1.50",

 		},

 	}

@@ -129,43 +129,43 @@ func TestGetAPIPath(t *testing.T) {

 			expected: "/v" + MaxAPIVersion + "/containers/json?s=c",

 		},

 		{

-			version:  "1.22",

+			version:  "1.50",

 			path:     "/containers/json",

-			expected: "/v1.22/containers/json",

+			expected: "/v1.50/containers/json",

 		},

 		{

-			version:  "1.22",

+			version:  "1.50",

 			path:     "/containers/json",

 			query:    url.Values{},

-			expected: "/v1.22/containers/json",

+			expected: "/v1.50/containers/json",

 		},

 		{

-			version:  "1.22",

+			version:  "1.50",

 			path:     "/containers/json",

 			query:    url.Values{"s": []string{"c"}},

-			expected: "/v1.22/containers/json?s=c",

+			expected: "/v1.50/containers/json?s=c",

 		},

 		{

-			version:  "v1.22",

+			version:  "v1.50",

 			path:     "/containers/json",

-			expected: "/v1.22/containers/json",

+			expected: "/v1.50/containers/json",

 		},

 		{

-			version:  "v1.22",

+			version:  "v1.50",

 			path:     "/containers/json",

 			query:    url.Values{},

-			expected: "/v1.22/containers/json",

+			expected: "/v1.50/containers/json",

 		},

 		{

-			version:  "v1.22",

+			version:  "v1.50",

 			path:     "/containers/json",

 			query:    url.Values{"s": []string{"c"}},

-			expected: "/v1.22/containers/json?s=c",

+			expected: "/v1.50/containers/json?s=c",

 		},

 		{

-			version:  "v1.22",

+			version:  "v1.50",

 			path:     "/networks/kiwl$%^",

-			expected: "/v1.22/networks/kiwl$%25%5E",

+			expected: "/v1.50/networks/kiwl$%25%5E",

 		},

 	}

@@ -236,7 +236,7 @@ func TestNewClientWithOpsFromEnvSetsDefaultVersion(t *testing.T) {

 	assert.NilError(t, err)

 	assert.Check(t, is.Equal(client.ClientVersion(), MaxAPIVersion))

-	const expected = "1.22"

+	const expected = "1.50"

 	t.Setenv("DOCKER_API_VERSION", expected)

 	client, err = NewClientWithOpts(FromEnv)

 	assert.NilError(t, err)

@@ -398,7 +398,7 @@ func TestNegotiateAPIVersionWithEmptyVersion(t *testing.T) {

 	client, err := NewClientWithOpts(WithVersion(""))

 	assert.NilError(t, err)

-	const expected = "1.35"

+	const expected = "1.50"

 	client.NegotiateAPIVersionPing(types.Ping{APIVersion: expected})

 	assert.Check(t, is.Equal(client.ClientVersion(), expected))

 }

@@ -406,11 +406,11 @@ func TestNegotiateAPIVersionWithEmptyVersion(t *testing.T) {

 // TestNegotiateAPIVersionWithFixedVersion asserts that initializing a client

 // with a fixed version disables API-version negotiation

 func TestNegotiateAPIVersionWithFixedVersion(t *testing.T) {

-	const customVersion = "1.35"

+	const customVersion = "1.50"

 	client, err := NewClientWithOpts(WithVersion(customVersion))

 	assert.NilError(t, err)

-	client.NegotiateAPIVersionPing(types.Ping{APIVersion: "1.31"})

+	client.NegotiateAPIVersionPing(types.Ping{APIVersion: "1.49"})

 	assert.Check(t, is.Equal(client.ClientVersion(), customVersion))

 }

@@ -418,42 +418,65 @@ func TestNegotiateAPIVersionWithFixedVersion(t *testing.T) {

 // version.

 func TestCustomAPIVersion(t *testing.T) {

 	tests := []struct {

+		doc      string

 		version  string

 		expected string

 	}{

 		{

+			doc:      "empty version",

 			version:  "",

 			expected: MaxAPIVersion,

 		},

 		{

-			version:  "1.0",

-			expected: "1.0",

+			doc:      "custom lower version, no v-prefix",

+			version:  "1.50",

+			expected: "1.50",

 		},

 		{

+			// We allow upgrading the client to an unsupported higher version for testing.

+			doc:      "upgrade version, no v-prefix",

 			version:  "9.99",

 			expected: "9.99",

 		},

 		{

+			// We currently ignore malformed versions.

+			doc:      "empty version, with v-prefix",

 			version:  "v",

 			expected: MaxAPIVersion,

 		},

 		{

-			version:  "v1.0",

-			expected: "1.0",

+			doc:      "custom lower version, with v-prefix",

+			version:  "v1.50",

+			expected: "1.50",

 		},

 		{

+			// We allow upgrading the client to an unsupported higher version for testing.

+			doc:      "upgrade version, with v-prefix",

 			version:  "v9.99",

 			expected: "9.99",

 		},

 		{

+			// We currently allow downgrading the client to an unsupported lower version for testing.

+			doc:      "downgrade unsupported version, no v-prefix",

+			version:  "1.0",

+			expected: "1.0",

+		},

+		{

+			// We currently allow downgrading the client to an unsupported lower version for testing.

+			doc:      "downgrade unsupported version, no v-prefix",

+			version:  "v1.0",

+			expected: "1.0",

+		},

+		{

 			// When manually setting a version, no validation happens.

 			// so anything is accepted.

+			doc:      "malformed version",

 			version:  "something-weird",

 			expected: "something-weird",

 		},

 	}

 	for _, tc := range tests {

-		t.Run(tc.version, func(t *testing.T) {

+		t.Run(tc.doc, func(t *testing.T) {

 			client, err := NewClientWithOpts(WithVersion(tc.version))

 			assert.NilError(t, err)

 			assert.Check(t, is.Equal(client.ClientVersion(), tc.expected))