diff --git a/CHANGELIST.md b/CHANGELIST.md
index 798ff258..9221f712 100644
--- a/CHANGELIST.md
+++ b/CHANGELIST.md
@@ -58,6 +58,7 @@
 - Add MCD/SS header support for Redumper
 - Fix MCD region(s) parsing
 - Update to DIC 20230606
+- Update redumper to build 166
 
 ### 2.5 (2023-03-12)
 
diff --git a/MPF.Modules/Redumper/Constants.cs b/MPF.Modules/Redumper/Constants.cs
index 8d8c1270..3c9d1ffa 100644
--- a/MPF.Modules/Redumper/Constants.cs
+++ b/MPF.Modules/Redumper/Constants.cs
@@ -11,8 +11,8 @@ namespace MPF.Modules.Redumper
         public const string Info = "info";
         public const string Protection = "protection";
         public const string Refine = "refine";
-        //public const string Rings = "rings";
         public const string Split = "split";
+        public const string Verify = "verify";
     }
 
     /// <summary>
@@ -63,5 +63,6 @@ namespace MPF.Modules.Redumper
         public const string LBAEnd = "--lba-end";
         public const string RefineSubchannel = "--refine-subchannel";
         public const string Skip = "--skip";
+        public const string DumpReadSize = "--dump-read-size";
     }
 }
\ No newline at end of file
diff --git a/MPF.Modules/Redumper/Parameters.cs b/MPF.Modules/Redumper/Parameters.cs
index 690a6e1c..7b5bfe68 100644
--- a/MPF.Modules/Redumper/Parameters.cs
+++ b/MPF.Modules/Redumper/Parameters.cs
@@ -152,6 +152,11 @@ namespace MPF.Modules.Redumper
         /// </summary>
         public string SkipValue { get; set; }
 
+        /// <summary>
+        /// Number of sectors to read at once on initial dump, DVD only (Default 32)
+        /// </summary>
+        public int? DumpReadSizeValue { get; set; }
+
         /// <summary>
         /// Maximum number of lead-in retries per session (Default 4)
         /// </summary>
@@ -549,6 +554,13 @@ namespace MPF.Modules.Redumper
                     parameters.Add($"{FlagStrings.Skip}={SkipValue}");
             }
 
+            // Dump Read Size
+            if (this[FlagStrings.DumpReadSize] == true)
+            {
+                if (DumpReadSizeValue != null && DumpReadSizeValue > 0)
+                    parameters.Add($"{FlagStrings.DumpReadSize}={DumpReadSizeValue}");
+            }
+
             #endregion
 
             return string.Join(" ", parameters);
@@ -605,6 +617,7 @@ namespace MPF.Modules.Redumper
                     FlagStrings.LBAEnd,
                     FlagStrings.RefineSubchannel,
                     FlagStrings.Skip,
+                    FlagStrings.DumpReadSize,
                 },
             };
         }
@@ -683,6 +696,7 @@ namespace MPF.Modules.Redumper
             LBAStartValue = null;
             LBAEndValue = null;
             SkipValue = null;
+            DumpReadSizeValue = null;
         }
 
         /// <inheritdoc/>
@@ -764,8 +778,8 @@ namespace MPF.Modules.Redumper
                     case CommandStrings.Protection:
                     case CommandStrings.Refine:
                     case CommandStrings.Split:
+                    case CommandStrings.Verify:
                     case CommandStrings.Info:
-                        // case CommandStrings.Rings:
                         ModeValues.Add(part);
                         break;
 
@@ -946,6 +960,11 @@ namespace MPF.Modules.Redumper
                 if (!string.IsNullOrWhiteSpace(stringValue))
                     SkipValue = stringValue;
 
+                // Skip
+                intValue = ProcessInt32Parameter(parts, FlagStrings.DumpReadSize, ref i);
+                if (!string.IsNullOrWhiteSpace(stringValue))
+                    DumpReadSizeValue = intValue;
+
                 #endregion
             }
 
diff --git a/appveyor.yml b/appveyor.yml
index da21acda..8f9639f0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -68,12 +68,12 @@ after_build:
 - 7z e DiscImageCreator_20230606.zip -oMPF\bin\Debug\net6.0-windows\win10-x64\publish\Programs\Creator Release_ANSI\*
 
 # Redumper
-- ps: appveyor DownloadFile https://github.com/superg/redumper/releases/download/build_151/redumper-2023.05.18_build151-win64.zip
-- 7z e redumper-2023.05.18_build151-win64.zip -oMPF\bin\Debug\net48\publish\Programs\Redumper redumper-2023.05.18_build151-win64\bin\*
-- 7z e redumper-2023.05.18_build151-win64.zip -oMPF\bin\Debug\net6.0-windows\win7-x64\publish\Programs\Redumper redumper-2023.05.18_build151-win64\bin\*
-- 7z e redumper-2023.05.18_build151-win64.zip -oMPF\bin\Debug\net6.0-windows\win8-x64\publish\Programs\Redumper redumper-2023.05.18_build151-win64\bin\*
-- 7z e redumper-2023.05.18_build151-win64.zip -oMPF\bin\Debug\net6.0-windows\win81-x64\publish\Programs\Redumper redumper-2023.05.18_build151-win64\bin\*
-- 7z e redumper-2023.05.18_build151-win64.zip -oMPF\bin\Debug\net6.0-windows\win10-x64\publish\Programs\Redumper redumper-2023.05.18_build151-win64\bin\*
+- ps: appveyor DownloadFile https://github.com/superg/redumper/releases/download/build_166/redumper-2023.06.09_build166-win64.zip
+- 7z e redumper-2023.06.09_build166-win64.zip -oMPF\bin\Debug\net48\publish\Programs\Redumper redumper-2023.06.09_build166-win64\bin\*
+- 7z e redumper-2023.06.09_build166-win64.zip -oMPF\bin\Debug\net6.0-windows\win7-x64\publish\Programs\Redumper redumper-2023.06.09_build166-win64\bin\*
+- 7z e redumper-2023.06.09_build166-win64.zip -oMPF\bin\Debug\net6.0-windows\win8-x64\publish\Programs\Redumper redumper-2023.06.09_build166-win64\bin\*
+- 7z e redumper-2023.06.09_build166-win64.zip -oMPF\bin\Debug\net6.0-windows\win81-x64\publish\Programs\Redumper redumper-2023.06.09_build166-win64\bin\*
+- 7z e redumper-2023.06.09_build166-win64.zip -oMPF\bin\Debug\net6.0-windows\win10-x64\publish\Programs\Redumper redumper-2023.06.09_build166-win64\bin\*
 
 # Subdump
 - ps: appveyor DownloadFile https://archive.org/download/subdump_fua_0x28/subdump_fua_0x28.zip