diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/aws-cdk-lambda-logging-config.assets.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/aws-cdk-lambda-logging-config.assets.json
index cc242bdce487c..479b904bec114 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/aws-cdk-lambda-logging-config.assets.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/aws-cdk-lambda-logging-config.assets.json
@@ -1,5 +1,5 @@
 {
-  "version": "34.0.0",
+  "version": "35.0.0",
   "files": {
     "c10a26dd32e7f7d2a9c057ec71b82b23ad867563a9b092f09ed73ef671035641": {
       "source": {
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/cdk.out b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/cdk.out
index 2313ab5436501..c5cb2e5de6344 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/cdk.out
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/cdk.out
@@ -1 +1 @@
-{"version":"34.0.0"}
\ No newline at end of file
+{"version":"35.0.0"}
\ No newline at end of file
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/integ.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/integ.json
index e5feef0abe915..57ccfacda4a52 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/integ.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/integ.json
@@ -1,5 +1,5 @@
 {
-  "version": "34.0.0",
+  "version": "35.0.0",
   "testCases": {
     "lambda-logging-config/DefaultTest": {
       "stacks": [
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/lambdaloggingconfigDefaultTestDeployAssert24012B25.assets.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/lambdaloggingconfigDefaultTestDeployAssert24012B25.assets.json
index a8e852ceaf06f..c5be7f49ada58 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/lambdaloggingconfigDefaultTestDeployAssert24012B25.assets.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/lambdaloggingconfigDefaultTestDeployAssert24012B25.assets.json
@@ -1,5 +1,5 @@
 {
-  "version": "34.0.0",
+  "version": "35.0.0",
   "files": {
     "21fbb51d7b23f6a6c262b46a9caee79d744a3ac019fd45422d988b96d44b2a22": {
       "source": {
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/manifest.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/manifest.json
index 8feb2b46a85b2..56321994a6b9d 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/manifest.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/manifest.json
@@ -1,5 +1,5 @@
 {
-  "version": "34.0.0",
+  "version": "35.0.0",
   "artifacts": {
     "aws-cdk-lambda-logging-config.assets": {
       "type": "cdk:asset-manifest",
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/tree.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/tree.json
index 3807537378927..75998f383169e 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/tree.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/tree.json
@@ -568,7 +568,7 @@
                 "path": "lambda-logging-config/DefaultTest/Default",
                 "constructInfo": {
                   "fqn": "constructs.Construct",
-                  "version": "10.2.70"
+                  "version": "10.3.0"
                 }
               },
               "DeployAssert": {
@@ -614,7 +614,7 @@
         "path": "Tree",
         "constructInfo": {
           "fqn": "constructs.Construct",
-          "version": "10.2.70"
+          "version": "10.3.0"
         }
       }
     },
diff --git a/packages/aws-cdk-lib/aws-lambda/lib/function.ts b/packages/aws-cdk-lib/aws-lambda/lib/function.ts
index 2a7d151a23c8e..b48425e7109b3 100644
--- a/packages/aws-cdk-lib/aws-lambda/lib/function.ts
+++ b/packages/aws-cdk-lib/aws-lambda/lib/function.ts
@@ -469,7 +469,7 @@ export interface FunctionOptions extends EventInvokeConfigOptions {
    * Sets the logFormat for the function.
    * @default Text format
    */
-  readonly logFormat?: string;
+  readonly logFormat?: LogFormat;
 
   /**
    * Sets the application log level for the function.