diff --git a/CHANGELOG.md b/CHANGELOG.md
index f232153..2283ffd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 
 - Reissue.finalize returns the version and value as an array
+- Documentation on the refined redo method in Gem::Version
+- Limit major numbers to Integers
 
 ## [0.1.2] - 2024-06-08
 
diff --git a/lib/reissue/version_updater.rb b/lib/reissue/version_updater.rb
index a5a6f68..cc8ca1f 100644
--- a/lib/reissue/version_updater.rb
+++ b/lib/reissue/version_updater.rb
@@ -10,14 +10,28 @@ module Versioning
       # Redoes the version based on the specified segment_name.
       #
       # @param segment_name [Symbol] The segment_name to redo the version.
-      #   Possible values are :major, :minor, or any other symbol.
+      #   Possible values are :major, :minor, :patch, or :pre.
       # @return [Gem::Version] The updated version.
       def redo(segment_name)
-        ::Gem::Version.create({
-          major: [segments[0].next, 0, 0],
-          minor: [segments[0], segments[1].next, 0],
-          patch: [segments[0], segments[1], segments[2].next]
-        }.fetch(segment_name.to_sym).join("."))
+        new_segments = case segment_name.to_sym
+        when :major
+          [segments[0].next, 0, 0]
+        when :minor
+          [segments[0], segments[1].next, 0]
+        when :patch
+          segments.slice(0, 2) + segments.slice(2..-1).then { |array|
+            array[-1] = array[-1].next
+            [array.map(&:to_s).join]
+          }
+        when :pre
+          segments.slice(0, 3) + segments.slice(3..-1).then { |array|
+            array[-1] = array[-1].next
+            [array.map(&:to_s).join]
+          }
+        else
+          raise ArgumentError, "Invalid segment name: #{segment_name}"
+        end
+        ::Gem::Version.create(new_segments.join("."))
       end
     end
 
@@ -78,7 +92,8 @@ def update(segment)
     # Regular expression pattern for matching the version string.
     #
     # @return [Regexp] The version regex pattern.
-    def version_regex = /(?<major>[a-zA-Z\d]+)\.(?<minor>[a-zA-Z\d]+)\.(?<patch>[a-zA-Z\d]+)/
+    VERSION_MATCH = /(?<major>\d+)\.(?<minor>[a-zA-Z\d]+)\.(?<patch>[a-zA-Z\d]+)(?<add>\.(?<pre>[a-zA-Z\d]+))?/
+    def version_regex = VERSION_MATCH
 
     # Writes the updated version to the specified file.
     #
diff --git a/test/fixtures/mixed_version.rb b/test/fixtures/mixed_version.rb
new file mode 100644
index 0000000..67024ed
--- /dev/null
+++ b/test/fixtures/mixed_version.rb
@@ -0,0 +1,5 @@
+module Reissue
+  module MixedGem
+    VERSION = "2.35.number19"
+  end
+end
diff --git a/test/fixtures/prerelease_version.rb b/test/fixtures/prerelease_version.rb
new file mode 100644
index 0000000..1ea0402
--- /dev/null
+++ b/test/fixtures/prerelease_version.rb
@@ -0,0 +1,5 @@
+module Reissue
+  module PrereleaseGem
+    VERSION = "3.2.1.rc1"
+  end
+end
diff --git a/test/test_version_updater.rb b/test/test_version_updater.rb
index 1970f4f..4db370f 100644
--- a/test/test_version_updater.rb
+++ b/test/test_version_updater.rb
@@ -52,5 +52,25 @@ class TestVersionUpdater < Minitest::Spec
       contents = @version_updater.update("patch")
       assert_equal "2.32.gamma", contents
     end
+
+    it "works with pre-release versions" do
+      @file = File.expand_path("fixtures/prerelease_version.rb", __dir__)
+      @version_updater = Reissue::VersionUpdater.new(@file)
+      contents = @version_updater.update("pre")
+      assert_equal "3.2.1.rc2", contents
+    end
+
+    it "respects mixed version strings for patches" do
+      @file = File.expand_path("fixtures/mixed_version.rb", __dir__)
+      @version_updater = Reissue::VersionUpdater.new(@file)
+      contents = @version_updater.update("patch")
+      assert_equal "2.35.number20", contents
+    end
+
+    it "raises an error for an invalid segment" do
+      assert_raises(ArgumentError) do
+        @version_updater.update("invalid")
+      end
+    end
   end
 end