diff --git a/Gemfile b/Gemfile
index 52b050b..33fbb67 100644
--- a/Gemfile
+++ b/Gemfile
@@ -36,7 +36,8 @@ gem 'active_fedora_relsint', :git => 'https://github.com/cul/active_fedora_relsi
 gem 'blacklight', '~> 7.22'
 gem 'view_component', '~> 2.51.0'
 # Use imogen for generating images
-gem 'imogen', '0.3.0'
+# gem 'imogen', '0.3.2'
+gem 'imogen', git: 'https://github.com/cul/imogen.git', branch: 'iiif_tile_generation_fixes'
 gem 'ruby-vips', '~> 2.0.16'
 #gem 'imogen', :path => '../imogen'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 6a5b420..ec59209 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,6 +27,14 @@ GIT
       sparql
       thread
 
+GIT
+  remote: https://github.com/cul/imogen.git
+  revision: 93fe37dcf7ff7f9f0b2d843bcc71f80a7b1b9d79
+  branch: iiif_tile_generation_fixes
+  specs:
+    imogen (0.4.0.pre.rc.1)
+      ruby-vips
+
 GIT
   remote: https://github.com/samvera-deprecated/jettywrapper.git
   revision: 6b03c21726a83dcecf09d9b20683bfcd63f106d1
@@ -208,8 +216,6 @@ GEM
     httpclient (2.8.3)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
-    imogen (0.3.0)
-      ruby-vips
     iso-639 (0.3.5)
     jbuilder (2.11.5)
       actionview (>= 5.0.0)
@@ -498,7 +504,7 @@ DEPENDENCIES
   capistrano-rails (~> 1.1)
   capistrano-rvm (~> 0.1)
   cul_hydra!
-  imogen (= 0.3.0)
+  imogen!
   jbuilder (~> 2.0)
   jettywrapper (>= 2.0.5)!
   jquery-rails
diff --git a/app/models/concerns/derivativo/iiif/info.rb b/app/models/concerns/derivativo/iiif/info.rb
index 47539e4..3e5e768 100644
--- a/app/models/concerns/derivativo/iiif/info.rb
+++ b/app/models/concerns/derivativo/iiif/info.rb
@@ -5,9 +5,7 @@ def info(id_url, version)
     raise 'Only IIIF version 2 is supported at the moment' unless version.to_s == '2'
 
     original_width, original_height = get_cachable_property(Derivativo::Iiif::CacheKeys::ORIGINAL_IMAGE_DIMENSIONS_KEY)
-    largest_scale_factor = Imogen::Zoomable.max_levels_for(original_width, original_height, IiifResource::TILE_SIZE)
-    largest_scale_factor -= Math.log2(IiifResource::TILE_SIZE/2) # remove scales smaller than tile size
-    scale_factors = (0..((largest_scale_factor).to_i)).map { |exp| 2.pow(exp) }
+    scale_factors = Imogen::Iiif::Tiles.scale_factors_for(original_width, original_height, IiifResource::TILE_SIZE)
 
     is_restricted_size_image = get_cachable_property(Derivativo::Iiif::CacheKeys::IS_RESTRICTED_SIZE_IMAGE_KEY)
 
@@ -21,7 +19,7 @@ def info(id_url, version)
       "tiles" => [
         {
           "width" => IiifResource::TILE_SIZE,
-          "height" => IiifResource::TILE_SIZE,
+          #"height" => IiifResource::TILE_SIZE,
           "scaleFactors" => scale_factors
         }
       ],