diff --git a/lib/mindee/input/sources/local_input_source.rb b/lib/mindee/input/sources/local_input_source.rb
index 8ebbc57b..a34261bd 100644
--- a/lib/mindee/input/sources/local_input_source.rb
+++ b/lib/mindee/input/sources/local_input_source.rb
@@ -16,6 +16,7 @@ module Source
       ALLOWED_MIME_TYPES = [
         'application/pdf',
         'image/heic',
+        'image/heif',
         'image/png',
         'image/jpeg',
         'image/tiff',
@@ -37,11 +38,7 @@ class LocalInputSource
         def initialize(io_stream, filename, repair_pdf: false)
           @io_stream = io_stream
           @filename = filename
-          @file_mimetype = if repair_pdf
-                             Marcel::MimeType.for @io_stream
-                           else
-                             Marcel::MimeType.for @io_stream, name: @filename
-                           end
+          @file_mimetype = detect_mime_type(repair_pdf)
           if ALLOWED_MIME_TYPES.include? @file_mimetype
             logger.debug("Loaded new input #{@filename} from #{self.class}")
             return
@@ -197,6 +194,28 @@ def source_text?
 
           Mindee::PDF::PDFTools.source_text?(@io_stream)
         end
+
+        private
+
+        # Checks the mimetype for the file. If it is a PDF, it will attempt to repair it if repair_pdf is true.
+        # @param repair_pdf [bool] Whether to attempt to repair the PDF.
+        # @return [String] The mimetype of the file.
+        def detect_mime_type(repair_pdf)
+          return Marcel::MimeType.for(@io_stream) if repair_pdf
+
+          heif_mimetype_from_extension || Marcel::MimeType.for(@io_stream, name: @filename)
+        end
+
+        # Checks the file extension for a HEIF mimetype.
+        # @return [String, nil] The mimetype if found, nil otherwise.
+        def heif_mimetype_from_extension
+          case File.extname(@filename.to_s).downcase
+          when '.heic'
+            'image/heic'
+          when '.heif'
+            'image/heif'
+          end
+        end
       end
 
       # Replaces non-ASCII characters by their UNICODE escape sequence.
diff --git a/sig/mindee/input/sources/local_input_source.rbs b/sig/mindee/input/sources/local_input_source.rbs
index 103ae5d8..97764a8f 100644
--- a/sig/mindee/input/sources/local_input_source.rbs
+++ b/sig/mindee/input/sources/local_input_source.rbs
@@ -23,6 +23,12 @@ module Mindee
         def write_to_file: (String?) -> void
         def compress!: (?quality: Integer, ?max_width: Integer?, ?max_height: Integer?, ?force_source_text: bool, ?disable_source_text: bool) -> Integer
         def source_text?: -> bool?
+
+        private
+
+        def detect_mime_type: (bool) -> String
+
+        def heif_mimetype_from_extension: -> String?
       end
       def self.convert_to_unicode_escape: (String) -> String
     end
diff --git a/spec/data b/spec/data
index 13093f3a..2d7fcf8f 160000
--- a/spec/data
+++ b/spec/data
@@ -1 +1 @@
-Subproject commit 13093f3a48de212ef26889df71199c1a2a9d1478
+Subproject commit 2d7fcf8f591f6d7f40e39862965325e6a8a21874
diff --git a/spec/input/sources/sources_spec.rb b/spec/input/sources/sources_spec.rb
index ea38ff6b..c070985d 100644
--- a/spec/input/sources/sources_spec.rb
+++ b/spec/input/sources/sources_spec.rb
@@ -54,6 +54,24 @@
       expect(input_source.page_count).to eq(1)
       expect(input_source.pdf?).to eq(false)
     end
+
+    it 'should load a HEIC from a path', :all_deps do
+      input_source = Mindee::Input::Source::PathInputSource.new(
+        File.join(FILE_TYPES_DIR, 'receipt.heif')
+      )
+      expect(input_source.file_mimetype).to eq('image/heif')
+      expect(input_source.filename).to eq('receipt.heif')
+      expect(input_source.page_count).to eq(1)
+      expect(input_source.pdf?).to eq(false)
+
+      input_source2 = Mindee::Input::Source::PathInputSource.new(
+        File.join(FILE_TYPES_DIR, 'receipt.jpg.heif')
+      )
+      expect(input_source2.file_mimetype).to eq('image/heif')
+      expect(input_source2.filename).to eq('receipt.jpg.heif')
+      expect(input_source2.page_count).to eq(1)
+      expect(input_source2.pdf?).to eq(false)
+    end
   end
 
   context 'A PDF input file', :all_deps do
diff --git a/spec/v2/file_operations/crop_operation_integration.rb b/spec/v2/file_operations/crop_operation_integration.rb
index 701d2a69..ab3b9ca9 100644
--- a/spec/v2/file_operations/crop_operation_integration.rb
+++ b/spec/v2/file_operations/crop_operation_integration.rb
@@ -65,7 +65,7 @@ def check_findoc_return(findoc_response)
 
     extracted_images.save_all_to_disk(OUTPUT_DIR)
 
-    expect(File.size(File.join(OUTPUT_DIR, 'crop_001.jpg'))).to be_between(560_000, 675_000)
-    expect(File.size(File.join(OUTPUT_DIR, 'crop_002.jpg'))).to be_between(580_000, 680_000)
+    expect(File.size(File.join(OUTPUT_DIR, 'crop_001.jpg'))).to be_between(560_000, 700_000)
+    expect(File.size(File.join(OUTPUT_DIR, 'crop_002.jpg'))).to be_between(580_000, 700_000)
   end
 end