diff --git a/RELEASE.CHANGELOG.md b/RELEASE.CHANGELOG.md
index a0a79ad..c605c2a 100644
--- a/RELEASE.CHANGELOG.md
+++ b/RELEASE.CHANGELOG.md
@@ -1,3 +1,7 @@
+### Jun 5, 2025
+`3.1.1`
+- Fix Logger Formatting override being ignored. ([#47](https://github.com/aws/aws-lambda-ruby-runtime-interface-client/pull/47))
+
 ### May 21, 2025
 `3.1.0`
 - Add support for multi tenancy ([#43](https://github.com/aws/aws-lambda-ruby-runtime-interface-client/pull/43))
diff --git a/lib/aws_lambda_ric/logger_patch.rb b/lib/aws_lambda_ric/logger_patch.rb
index 82f2963..bc3e0f1 100644
--- a/lib/aws_lambda_ric/logger_patch.rb
+++ b/lib/aws_lambda_ric/logger_patch.rb
@@ -4,15 +4,16 @@ module LoggerPatch
   def initialize(logdev, shift_age = 0, shift_size = 1048576, level: 'debug',
                  progname: nil, formatter: nil, datetime_format: nil,
                  binmode: false, shift_period_suffix: '%Y%m%d')
-    logdev_lambda_overwrite = logdev
+    logdev_lambda_override = logdev
+    formatter_override = formatter
     # use unpatched constructor if logdev is a filename or an IO Object other than $stdout or $stderr
     if !logdev || logdev == $stdout || logdev == $stderr
-      logdev_lambda_overwrite = AwsLambdaRIC::TelemetryLogger.telemetry_log_sink
-      @default_formatter = LogFormatter.new
+      logdev_lambda_override = AwsLambdaRIC::TelemetryLogger.telemetry_log_sink
+      formatter_override = LogFormatter.new
     end
 
-    super(logdev_lambda_overwrite, shift_age, shift_size, level: level, progname: progname,
-                                    formatter: formatter, datetime_format: datetime_format,
+    super(logdev_lambda_override, shift_age, shift_size, level: level, progname: progname,
+                                    formatter: formatter_override, datetime_format: datetime_format,
                                     binmode: binmode, shift_period_suffix: shift_period_suffix)
   end
 end
diff --git a/lib/aws_lambda_ric/version.rb b/lib/aws_lambda_ric/version.rb
index e643c8c..a32be95 100644
--- a/lib/aws_lambda_ric/version.rb
+++ b/lib/aws_lambda_ric/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module AwsLambdaRIC
-  VERSION = '3.1.0'
+  VERSION = '3.1.1'
 end