diff --git a/lib/en57/configuration.rb b/lib/en57/configuration.rb
index 1670cbf..00aa196 100644
--- a/lib/en57/configuration.rb
+++ b/lib/en57/configuration.rb
@@ -6,9 +6,10 @@ module En57
   class Configuration
     include Singleton
 
-    attr_accessor :serializer
+    attr_accessor :append_retries, :serializer
 
     def initialize
+      @append_retries = 9
       @serializer = JsonSerializer.new
     end
   end
diff --git a/lib/en57/repository.rb b/lib/en57/repository.rb
index 0d4c72e..0d1b02c 100644
--- a/lib/en57/repository.rb
+++ b/lib/en57/repository.rb
@@ -39,7 +39,7 @@ module En57
         JSON.generate(append_condition),
       ]
 
-      attempts_remaining = 3
+      attempts_remaining = En57.configuration.append_retries
       begin
         row =
           if fail_if_events_match.empty?
diff --git a/test/test_en57.rb b/test/test_en57.rb
index 3a0f030..eadbeb8 100644
--- a/test/test_en57.rb
+++ b/test/test_en57.rb
@@ -24,6 +24,10 @@ module En57
       RUBY
     end
 
+    def test_configuration_default_append_retries
+      assert_equal 9, En57.configuration.append_retries
+    end
+
     def test_configuration_default_serializer
       assert_kind_of JsonSerializer, En57.configuration.serializer
     end
@@ -31,8 +35,12 @@ module En57
     def test_configure
       with_empty_configuration do
         serializer = Object.new
-        En57.configure { |c| c.serializer = serializer }
+        En57.configure do |c|
+          c.append_retries = 2
+          c.serializer = serializer
+        end
 
+        assert_equal 2, En57.configuration.append_retries
         assert_equal serializer, En57.configuration.serializer
       end
     end
diff --git a/test/test_repository.rb b/test/test_repository.rb
index cf6355a..3aefccf 100644
--- a/test/test_repository.rb
+++ b/test/test_repository.rb
@@ -550,11 +550,11 @@ module En57
       end
     end
 
-    def test_append_raises_serialization_error_after_four_attempts
+    def test_append_raises_serialization_error_after_default_retries
       attempts = 0
 
       with_connection do |connection|
-        4.times do
+        10.times do
           connection.expect(:exec, nil, ["BEGIN ISOLATION LEVEL SERIALIZABLE"])
           connection.expect(:exec_params, nil) do
             attempts += 1
@@ -569,10 +569,41 @@ module En57
             JsonSerializer.new,
           ).append([], fail_if: fail_if_with_criteria)
         end
-        assert_equal(4, attempts)
+        assert_equal(10, attempts)
       end
     end
 
+    def test_append_raises_serialization_error_after_configured_retries
+      attempts = 0
+
+      En57
+        .configuration
+        .stub(:append_retries, 1) do
+          with_connection do |connection|
+            2.times do
+              connection.expect(
+                :exec,
+                nil,
+                ["BEGIN ISOLATION LEVEL SERIALIZABLE"],
+              )
+              connection.expect(:exec_params, nil) do
+                attempts += 1
+                raise PG::TRSerializationFailure.new
+              end
+              connection.expect(:exec, nil, ["ROLLBACK"])
+            end
+
+            assert_raises(AppendRetriesExhausted) do
+              Repository.new(
+                PgAdapter.for_connection(connection),
+                JsonSerializer.new,
+              ).append([], fail_if: fail_if_with_criteria)
+            end
+            assert_equal(2, attempts)
+          end
+        end
+    end
+
     private
 
     def ids = @ids ||= Hash.new { |h, k| h[k] = SecureRandom.uuid_v7 }
diff --git a/test/test_stress.rb b/test/test_stress.rb
index 6441ecb..9d9eb5e 100644
--- a/test/test_stress.rb
+++ b/test/test_stress.rb
@@ -51,7 +51,9 @@ module En57
           assert_equal(1, results.select { Success === it }.size)
           assert_equal(
             (concurrency - 1),
-            results.select { Failure === it || AppendRetriesExhausted === it }.size,
+            results
+              .select { Failure === it || AppendRetriesExhausted === it }
+              .size,
           )
           assert_equal(
             1,