diff --git a/src/NzbDrone.Core.Test/HealthCheck/Checks/MonoVersionCheckFixture.cs b/src/NzbDrone.Core.Test/HealthCheck/Checks/MonoVersionCheckFixture.cs
index 74d0bace8..4be2bdeb0 100644
--- a/src/NzbDrone.Core.Test/HealthCheck/Checks/MonoVersionCheckFixture.cs
+++ b/src/NzbDrone.Core.Test/HealthCheck/Checks/MonoVersionCheckFixture.cs
@@ -28,9 +28,9 @@ namespace NzbDrone.Core.Test.HealthCheck.Checks
                   .Returns(new Version(version));
         }
 
-        [TestCase("5.18")]
         [TestCase("5.20")]
         [TestCase("6.4")]
+        [TestCase("6.12")]
         public void should_return_ok(string version)
         {
             GivenOutput(version);
@@ -71,6 +71,7 @@ namespace NzbDrone.Core.Test.HealthCheck.Checks
         [TestCase("5.12")]
         [TestCase("5.14")]
         [TestCase("5.16")]
+        [TestCase("5.18")]
         public void should_return_error(string version)
         {
             GivenOutput(version);
diff --git a/src/NzbDrone.Core/HealthCheck/Checks/MonoVersionCheck.cs b/src/NzbDrone.Core/HealthCheck/Checks/MonoVersionCheck.cs
index 400246687..c723c583f 100644
--- a/src/NzbDrone.Core/HealthCheck/Checks/MonoVersionCheck.cs
+++ b/src/NzbDrone.Core/HealthCheck/Checks/MonoVersionCheck.cs
@@ -26,19 +26,9 @@ namespace NzbDrone.Core.HealthCheck.Checks
 
             var monoVersion = _platformInfo.Version;
 
-            // Known buggy Mono versions
-            if (monoVersion == new Version("4.4.0") || monoVersion == new Version("4.4.1"))
-            {
-                _logger.Debug("Mono version {0}", monoVersion);
-                return new HealthCheck(GetType(),
-                    HealthCheckResult.Error,
-                    $"Currently installed Mono version {monoVersion} has a bug that causes issues connecting to indexers/download clients. You should upgrade to a higher version",
-                    "#currently_installed_mono_version_is_old_and_unsupported");
-            }
-
             // Currently best stable Mono version (5.18 gets us .net 4.7.2 support)
             var bestVersion = new Version("5.20");
-            var targetVersion = new Version("5.18");
+            var targetVersion = new Version("5.20");
             if (monoVersion >= targetVersion)
             {
                 _logger.Debug("Mono version is {0} or better: {1}", targetVersion, monoVersion);
@@ -46,7 +36,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
             }
 
             // Stable Mono versions
-            var stableVersion = new Version("5.18");
+            var stableVersion = new Version("5.20");
             if (monoVersion >= stableVersion)
             {
                 _logger.Debug("Mono version is {0} or better: {1}", stableVersion, monoVersion);
@@ -56,7 +46,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
                     "#currently_installed_mono_version_is_supported_but_upgrading_is_recommended");
             }
 
-            var oldVersion = new Version("5.4");
+            var oldVersion = new Version("5.20");
             if (monoVersion >= oldVersion)
             {
                 return new HealthCheck(GetType(),