diff --git a/jenkinsPlugins2nix.cabal b/jenkinsPlugins2nix.cabal
--- a/jenkinsPlugins2nix.cabal
+++ b/jenkinsPlugins2nix.cabal
@@ -1,5 +1,5 @@
 name:                jenkinsPlugins2nix
-version:             0.3.0.1
+version:             0.4.0.0
 synopsis:            Generate nix for Jenkins plugins.
 description:         Generate nix for Jenkins plugins.
 homepage:            https://github.com/Fuuzetsu/jenkinsPlugins2nix#readme
diff --git a/src/Nix/JenkinsPlugins2Nix/Parser.hs b/src/Nix/JenkinsPlugins2Nix/Parser.hs
--- a/src/Nix/JenkinsPlugins2Nix/Parser.hs
+++ b/src/Nix/JenkinsPlugins2Nix/Parser.hs
@@ -54,7 +54,7 @@
         group_id' <- optional $ getKey "Group-Id"
         short_name' <- getKey "Short-Name"
         long_name' <- getKey "Long-Name"
-        url' <- getKey "Url"
+        url' <- optional $ getKey "Url"
         plugin_version' <- getKey "Plugin-Version"
         hudson_version' <- optional $ getKey "Hudson-Version"
         jenkins_version' <- optional $ getKey "Jenkins-Version"
diff --git a/src/Nix/JenkinsPlugins2Nix/Types.hs b/src/Nix/JenkinsPlugins2Nix/Types.hs
--- a/src/Nix/JenkinsPlugins2Nix/Types.hs
+++ b/src/Nix/JenkinsPlugins2Nix/Types.hs
@@ -98,7 +98,7 @@
     -- | @Long-Name@.
   , long_name :: !Text
     -- | @Url@.
-  , url :: !Text
+  , url :: !(Maybe Text)
     -- | @Plugin-Version@.
   , plugin_version :: !Text
     -- | @Hudson-Version@.
diff --git a/test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs b/test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs
--- a/test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs
+++ b/test/Nix/JenkinsPlugins2Nix/Tests/Parser.hs
@@ -65,7 +65,7 @@
       , group_id = Just "org.jenkins-ci.plugins"
       , short_name = "github-pullrequest"
       , long_name = "GitHub Integration Plugin"
-      , url = "https://wiki.jenkins-ci.org/display/JENKINS/GitHub+Integration+Plugin"
+      , url = Just "https://wiki.jenkins-ci.org/display/JENKINS/GitHub+Integration+Plugin"
       , plugin_version = "0.1.0-rc24"
       , hudson_version = Just "1.625.3"
       , jenkins_version = Just "1.625.3"