diff --git a/Project.toml b/Project.toml
index 8223321..a11430c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Coverage"
 uuid = "a2441757-f6aa-5fb2-8edb-039e3f45d037"
 authors = ["Iain Dunning <iaindunning@gmail.com>", "contributors"]
-version = "1.4.0"
+version = "1.5.0"
 
 [deps]
 CoverageTools = "c36e975a-824b-4404-a568-ef97ca766997"
diff --git a/src/codecovio.jl b/src/codecovio.jl
index c6f93cb..0cf2129 100644
--- a/src/codecovio.jl
+++ b/src/codecovio.jl
@@ -71,6 +71,7 @@ end
 
 add_ci_to_kwargs(; kwargs...) = add_ci_to_kwargs(Dict{Symbol,Any}(kwargs))
 function add_ci_to_kwargs(kwargs::Dict)
+    # https://docs.codecov.com/reference/upload
     if lowercase(get(ENV, "APPVEYOR", "false")) == "true"
         appveyor_pr = get(ENV, "APPVEYOR_PULL_REQUEST_NUMBER", "")
         appveyor_job = join(
@@ -175,6 +176,19 @@ function add_ci_to_kwargs(kwargs::Dict)
         if ENV["BUILDKITE_PULL_REQUEST"] != "false"
             kwargs = set_defaults(kwargs, pr = ENV["BUILDKITE_PULL_REQUEST"])
         end
+    elseif lowercase(get(ENV, "GITLAB_CI", "false")) == "true"
+        # Gitlab API: https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
+        branch = ENV["CI_COMMIT_REF_NAME"]
+        num_mr = branch == ENV["CI_DEFAULT_BRANCH"] ? "false" : ENV["CI_MERGE_REQUEST_IID"]
+        kwargs = set_defaults(kwargs,
+            service      = "gitlab",
+            branch       = branch,
+            commit       = ENV["CI_COMMIT_SHA"],
+            job          = ENV["CI_JOB_ID"],
+            build_url    = ENV["CI_PIPELINE_URL"],
+            build        = ENV["CI_PIPELINE_IID"],
+            pr           = num_mr,
+        )
     else
         error("No compatible CI platform detected")
     end
diff --git a/src/coveralls.jl b/src/coveralls.jl
index 77eb00b..19cd14f 100644
--- a/src/coveralls.jl
+++ b/src/coveralls.jl
@@ -69,7 +69,7 @@ end
 
 function prepare_request(fcs::Vector{FileCoverage}, local_env::Bool, git_info=query_git_info)
     data = Dict{String,Any}("source_files" => map(to_json, fcs))
-
+    # Coveralls API : https://docs.coveralls.io/api-reference
     if local_env
         # Attempt to parse git info via git_info, unless the user explicitly disables it by setting git_info to nothing
         data["service_name"] = "local"
@@ -105,6 +105,16 @@ function prepare_request(fcs::Vector{FileCoverage}, local_env::Bool, git_info=qu
         github_pr = get(github_pr_info, "number", "")
         github_pr::Union{AbstractString, Integer}
         ((github_pr isa Integer) || (!isempty(github_pr))) && (data["service_pull_request"] = strip(string(github_pr)))
+    elseif lowercase(get(ENV, "GITLAB_CI", "false")) == "true"
+        # Gitlab API: https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
+        branch = ENV["CI_COMMIT_REF_NAME"]
+        num_mr = branch == ENV["CI_DEFAULT_BRANCH"] ? "false" : ENV["CI_MERGE_REQUEST_IID"]
+        data["service_pull_request"] = num_mr
+        data["service_number"] = ENV["CI_PIPELINE_IID"]
+        data["service_job_id"] = ENV["CI_JOB_ID"]
+        data["service_name"] = "gitlab"
+        data["git"] = parse_git_info(git_info)
+        data["git"]["branch"] = branch
     else
         data["git"] = parse_git_info(git_info)
     end
diff --git a/test/runtests.jl b/test/runtests.jl
index b81a76f..530f1bf 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -482,6 +482,79 @@ withenv(
             end
         end
 
+        # test Gitlab ci submission process
+
+        # set up Gitlab ci env
+        withenv(
+            "GITLAB_CI" => "true",
+            "CI_MERGE_REQUEST_IID" => "t_pr",
+            "CI_JOB_ID" => "t_proj",
+            "CI_COMMIT_REF_NAME" => "t_branch",
+            "CI_COMMIT_SHA" => "t_commit",
+            "CI_PROJECT_NAME" => "t_repo",
+            "CI_PIPELINE_URL" => "t_url",
+            "CI_PIPELINE_IID" => "t_num",
+            "CI_DEFAULT_BRANCH" => "master",
+            ) do
+
+            # default values
+            codecov_url = construct_uri_string_ci()
+            @test occursin("codecov.io", codecov_url)
+            @test occursin("service=gitlab", codecov_url)
+            @test occursin("branch=t_branch", codecov_url)
+            @test occursin("commit=t_commit", codecov_url)
+            @test occursin("pr=t_pr", codecov_url)
+            @test occursin("build_url=t_url", codecov_url)
+            @test occursin("build=t_num", codecov_url)
+
+            # env var url override
+            withenv( "CODECOV_URL" => "https://enterprise-codecov-1.com" ) do
+
+                codecov_url = construct_uri_string_ci()
+                @test occursin("enterprise-codecov-1.com", codecov_url)
+                @test occursin("service=gitlab", codecov_url)
+                @test occursin("branch=t_branch", codecov_url)
+                @test occursin("commit=t_commit", codecov_url)
+                @test occursin("pr=t_pr", codecov_url)
+                @test occursin("build_url=t_url", codecov_url)
+                @test occursin("build=t_num", codecov_url)
+
+                # function argument url override
+                codecov_url = construct_uri_string_ci(codecov_url="https://enterprise-codecov-2.com")
+                @test occursin("enterprise-codecov-2.com", codecov_url)
+                @test occursin("service=gitlab", codecov_url)
+                @test occursin("branch=t_branch", codecov_url)
+                @test occursin("commit=t_commit", codecov_url)
+                @test occursin("pr=t_pr", codecov_url)
+                @test occursin("build_url=t_url", codecov_url)
+                @test occursin("build=t_num", codecov_url)
+
+                # env var token
+                withenv( "CODECOV_TOKEN" => "token_name_1" ) do
+
+                    codecov_url = construct_uri_string_ci()
+                    @test occursin("enterprise-codecov-1.com", codecov_url)
+                    @test occursin("token=token_name_1", codecov_url)
+                    @test occursin("service=gitlab", codecov_url)
+                    @test occursin("branch=t_branch", codecov_url)
+                    @test occursin("commit=t_commit", codecov_url)
+                    @test occursin("pr=t_pr", codecov_url)
+                    @test occursin("build_url=t_url", codecov_url)
+                    @test occursin("build=t_num", codecov_url)
+
+                    # function argument token url override
+                    codecov_url = construct_uri_string_ci(token="token_name_2")
+                    @test occursin("enterprise-codecov-1.com", codecov_url)
+                    @test occursin("service=gitlab", codecov_url)
+                    @test occursin("branch=t_branch", codecov_url)
+                    @test occursin("commit=t_commit", codecov_url)
+                    @test occursin("pr=t_pr", codecov_url)
+                    @test occursin("build_url=t_url", codecov_url)
+                    @test occursin("build=t_num", codecov_url)
+                end
+            end
+        end
+
         # test codecov token masking
         withenv(
             "APPVEYOR" => "true",
@@ -637,6 +710,21 @@ withenv(
                 end
         end
 
+        # test Gitlab see https://docs.coveralls.io/api-reference
+        withenv("GITLAB_CI" => "true",
+                "CI_PIPELINE_IID" => "my_job_num",
+                "CI_JOB_ID" => "my_job_id",
+                "CI_COMMIT_REF_NAME" => "test",
+                "CI_DEFAULT_BRANCH" => "master",
+                "CI_MERGE_REQUEST_IID" => "t_pr") do
+                request = Coverage.Coveralls.prepare_request(fcs, false)
+                @test request["repo_token"] == "token_name_1"
+                @test request["service_number"] == "my_job_num"
+                @test request["service_job_id"] == "my_job_id"
+                @test request["service_name"] == "gitlab"
+                @test request["service_pull_request"] == "t_pr"
+        end
+
         # test git_info (only works with Jenkins & local at the moment)
         withenv("JENKINS" => "true",
                 "BUILD_ID" => "my_job_id",