diff --git a/package.json b/package.json
index dfbbfa0..bbd46b1 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "node": ">=10"
   },
   "description": "SDMX REST API client for JavaScript",
-  "version": "2.15.1",
+  "version": "2.15.2",
   "main": "./lib/index.js",
   "scripts": {
     "prebuild": "rm -rf lib && mkdir lib",
@@ -57,18 +57,18 @@
   "devDependencies": {
     "chai": "4.2.0",
     "chai-as-promised": "7.1.1",
-    "codecov": "3.6.1",
+    "codecov": "3.6.5",
     "coffee-coverage": "3.0.1",
     "coffeeify": "3.0.1",
     "coffeelint": "2.1.0",
     "coffeescript": "2.4.1",
     "commitizen": "4.0.3",
-    "cz-conventional-changelog": "3.0.2",
-    "husky": "3.1.0",
+    "cz-conventional-changelog": "3.1.0",
+    "husky": "4.2.3",
     "istanbul": "0.4.5",
     "mocha": "5.2.0",
-    "nock": "11.7.0",
-    "semantic-release": "15.13.31"
+    "nock": "12.0.1",
+    "semantic-release": "17.0.4"
   },
   "config": {
     "commitizen": {
diff --git a/src/data/data-query.coffee b/src/data/data-query.coffee
index 7095fc0..0840e63 100644
--- a/src/data/data-query.coffee
+++ b/src/data/data-query.coffee
@@ -7,7 +7,6 @@
 defaults =
   key: 'all'
   provider: 'all'
-  obsDimension: 'TIME_PERIOD'
   detail: DataDetail.FULL
   history: false
 
@@ -20,7 +19,8 @@ ValidQuery =
   updatedAfter: (i, e) -> !i or isValidDate(i, 'updatedAfter', e)
   firstNObs: (i, e) -> !i or isValidNObs(i, 'firstNObs', e)
   lastNObs: (i, e) -> !i or isValidNObs(i, 'lastNObs', e)
-  obsDimension: (i, e) -> isValidPattern(i, NCNameIDType, 'obs dimension', e)
+  obsDimension: (i, e) ->
+    !i or isValidPattern(i, NCNameIDType, 'obs dimension', e)
   detail: (i, e) -> isValidEnum(i, DataDetail, 'details', e)
   history: (i, e) -> isValidHistory(i, e)
 
@@ -66,7 +66,7 @@ query = class DataQuery
       updatedAfter: opts?.updatedAfter
       firstNObs: opts?.firstNObs
       lastNObs: opts?.lastNObs
-      obsDimension: opts?.obsDimension ? defaults.obsDimension
+      obsDimension: opts?.obsDimension
       detail: opts?.detail ? defaults.detail
       history: opts?.history ? defaults.history
     input = isValidQuery query
diff --git a/src/utils/url-generator.coffee b/src/utils/url-generator.coffee
index bf62df8..e5dbf62 100644
--- a/src/utils/url-generator.coffee
+++ b/src/utils/url-generator.coffee
@@ -22,9 +22,10 @@ createEntryPoint = (s) ->
 
 createDataQuery = (query, service) ->
   url = createEntryPoint service
-  url = url + "data/#{query.flow}/#{query.key}/#{query.provider}"
-  url = url + "?dimensionAtObservation=#{query.obsDimension}"
-  url = url + "&detail=#{query.detail}"
+  url = url + "data/#{query.flow}/#{query.key}/#{query.provider}?"
+  if query.obsDimension
+    url = url + "dimensionAtObservation=#{query.obsDimension}&"
+  url = url + "detail=#{query.detail}"
   if (service.api isnt ApiVersion.v1_0_0 and
   service.api isnt ApiVersion.v1_0_1 and
   service.api isnt ApiVersion.v1_0_2)
@@ -50,8 +51,7 @@ hasHistory = (q, s) ->
 
 handleDataQueryParams = (q, s) ->
   p = []
-  p.push "dimensionAtObservation=#{q.obsDimension}" unless \
-    q.obsDimension is 'TIME_PERIOD'
+  p.push "dimensionAtObservation=#{q.obsDimension}" if q.obsDimension
   p.push "detail=#{q.detail}" unless q.detail is 'full'
   p.push "includeHistory=#{q.history}" if hasHistory(q, s)
   p.push "startPeriod=#{q.start}" if q.start
diff --git a/test/data/data-query.test.coffee b/test/data/data-query.test.coffee
index 02e3994..c41d062 100644
--- a/test/data/data-query.test.coffee
+++ b/test/data/data-query.test.coffee
@@ -31,7 +31,7 @@ describe 'Data queries', ->
     q.should.have.property('updatedAfter').that.is.undefined
     q.should.have.property('firstNObs').that.is.undefined
     q.should.have.property('lastNObs').that.is.undefined
-    q.should.have.property('obsDimension').that.equals 'TIME_PERIOD'
+    q.should.have.property('obsDimension').that.is.undefined
     q.should.have.property('detail').that.equals 'full'
     q.should.have.property('history').that.is.false
 
diff --git a/test/index.test.coffee b/test/index.test.coffee
index e8d9abc..a4518b1 100644
--- a/test/index.test.coffee
+++ b/test/index.test.coffee
@@ -108,7 +108,7 @@ describe 'API', ->
       query.should.have.property('updatedAfter').that.is.undefined
       query.should.have.property('firstNObs').that.is.undefined
       query.should.have.property('lastNObs').that.is.undefined
-      query.should.have.property('obsDimension').that.equals 'TIME_PERIOD'
+      query.should.have.property('obsDimension').that.is.undefined
       query.should.have.property('detail').that.equals 'full'
       query.should.have.property('history').that.is.false
 
diff --git a/test/utils/url-generator.test.coffee b/test/utils/url-generator.test.coffee
index 4411351..c71ca21 100644
--- a/test/utils/url-generator.test.coffee
+++ b/test/utils/url-generator.test.coffee
@@ -371,7 +371,7 @@ describe 'URL Generator', ->
 
     it 'generates a URL for a partial data query', ->
       expected = "http://test.com/data/EXR/A..EUR.SP00.A/all?\
-      dimensionAtObservation=TIME_PERIOD&detail=full&includeHistory=false"
+      detail=full&includeHistory=false"
       query = DataQuery.from({flow: 'EXR', key: 'A..EUR.SP00.A'})
       service = Service.from({url: 'http://test.com', api: ApiVersion.v1_1_0})
       url = new UrlGenerator().getUrl(query, service)