diff --git a/spec/models/rating/averager_data_spec.rb b/spec/models/rating/averager_data_spec.rb
index a962769..1e7ca27 100644
--- a/spec/models/rating/averager_data_spec.rb
+++ b/spec/models/rating/averager_data_spec.rb
@@ -13,7 +13,13 @@ RSpec.describe Rating::Rating, ':averager_data' do
     end
 
     it 'returns the average of number of records for the given resource type' do
-      expect(result.count_avg).to eq(BigDecimal('1.333333333333333333'))
+      if ENV.fetch('DB') == 'mysql'
+        expect(result.count_avg).to eq(BigDecimal('1.333333333333333333'))
+      elsif ENV.fetch('DB') == 'postgres'
+        expect(result.count_avg).to eq(BigDecimal('1.3333333333333333'))
+      else
+        raise('DB env missing!')
+      end
     end
   end
 
diff --git a/spec/models/rating/data_spec.rb b/spec/models/rating/data_spec.rb
index d870424..adfa826 100644
--- a/spec/models/rating/data_spec.rb
+++ b/spec/models/rating/data_spec.rb
@@ -21,7 +21,13 @@ RSpec.describe Rating::Rating, ':data' do
     end
 
     it 'returns the estimate for a resource' do
-      expect(result[:estimate]).to eq(BigDecimal('42.5000000000000000012000000505'))
+      if ENV.fetch('DB') == 'mysql'
+        expect(result[:estimate]).to eq(BigDecimal('42.5000000000000000012000000505'))
+      elsif ENV.fetch('DB') == 'postgres'
+        expect(result[:estimate]).to eq(BigDecimal('42.5000000000000001200000000000000012505'))
+      else
+        raise('DB env missing!')
+      end
     end
   end
 
diff --git a/spec/models/rating/update_rating_spec.rb b/spec/models/rating/update_rating_spec.rb
index 319f3f1..0afddca 100644
--- a/spec/models/rating/update_rating_spec.rb
+++ b/spec/models/rating/update_rating_spec.rb
@@ -9,10 +9,18 @@ RSpec.describe Rating::Rating, ':update_rating' do
     it 'updates the rating data of the given resource' do
       record = described_class.find_by(resource: article_1)
 
-      expect(record.average).to  eq(BigDecimal('50.5'))
-      expect(record.estimate).to eq(BigDecimal('42.5'))
-      expect(record.sum).to      be(101)
-      expect(record.total).to    be(2)
+      if ENV.fetch('DB') == 'mysql'
+        expect(record.average).to  eq(BigDecimal('50.5'))
+        expect(record.estimate).to eq(BigDecimal('42.5'))
+      elsif ENV.fetch('DB') == 'postgres'
+        expect(record.average).to  eq(BigDecimal('50.5'))
+        expect(record.estimate).to eq(BigDecimal('42.5000000000000001'))
+      else
+        raise('DB env missing!')
+      end
+
+      expect(record.sum).to   be(101)
+      expect(record.total).to be(2)
     end
   end
 
diff --git a/spec/support/database.rb b/spec/support/database.rb
index ea50d67..9a38ec8 100644
--- a/spec/support/database.rb
+++ b/spec/support/database.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-ENV['DB'] ||= 'mysql'
+ENV['DB'] ||= 'postgres'
 
 conn_params = { database: :rating_test, host: '127.0.0.1' }