diff --git a/CLI/lib/baseCommand.js b/CLI/lib/baseCommand.js
index 178d2b4..dacefcc 100644
--- a/CLI/lib/baseCommand.js
+++ b/CLI/lib/baseCommand.js
@@ -1108,13 +1108,15 @@ class BaseCommand {
     }
 
     getLogConfig () {
+        const maxLogSize = utils.getEnvNumericValue('WCHTOOLS_LOG_MAX_SIZE');
+        const maxBackups = utils.getEnvNumericValue('WCHTOOLS_LOG_MAX_BACKUPS');
         // Set up logging for the CLI in the directory where the files exist, and then get the logger.
         const fileAppender = {
             type: 'file',
             filename: './' + utils.ProductAbrev + '-cli.log',
             category: cliLog,
-            maxLogSize: 30480,
-            backups: 3
+            maxLogSize: maxLogSize,
+            backups: maxBackups
         };
         const consoleAppender = {
             type: 'console',
diff --git a/CLI/package.json b/CLI/package.json
index 45e8913..6ae8d3b 100644
--- a/CLI/package.json
+++ b/CLI/package.json
@@ -1,7 +1,7 @@
 {
   "name": "wchtools-cli",
   "description": "Command line tools for IBM Watson Content Hub",
-  "version": "4.0.1",
+  "version": "4.0.3",
   "keywords": [
     "cli"
   ],
diff --git a/authoring-api/lib/utils/utils.js b/authoring-api/lib/utils/utils.js
index 2c15fad..0f7c826 100644
--- a/authoring-api/lib/utils/utils.js
+++ b/authoring-api/lib/utils/utils.js
@@ -362,6 +362,24 @@ function getErrorFromResponse (response) {
     return err;
 }
 
+/**
+ * Returns the numeric value of a process environment variable, or the supplied default if it is not a numeric value.
+ * @param variableName the name of the process environment variable
+ * @param defaultValue the default value
+ * @returns The numeric value, the default value, or undefined.
+ */
+function getEnvNumericValue (variableName, defaultValue) {
+    let result = defaultValue;
+    const n = process.env[variableName];
+    if (n && !Number.isNaN(n) && Number(n) >= 0 && Number.isSafeInteger(Number(n))) {
+        result = Number(n);
+    }
+    return result;
+}
+
+const maxLogSize = getEnvNumericValue('WCHTOOLS_LOG_MAX_SIZE', 5242880);
+const maxBackups = getEnvNumericValue('WCHTOOLS_LOG_MAX_BACKUPS', 5);
+
 const apisLog = ProductAbrev + " " + ProductVersion;
 let apisLogConfig;
 
@@ -380,8 +398,8 @@ if (buildTag && buildTag.indexOf('jenkins') !== -1) {
                 type: 'file',
                 filename: getApiLogPath(),
                 category: apisLog,
-                maxLogSize: 500480,
-                backups: 5
+                maxLogSize: maxLogSize,
+                backups: maxBackups
             }
         },
         categories: {
@@ -397,8 +415,8 @@ if (buildTag && buildTag.indexOf('jenkins') !== -1) {
                 type: 'file',
                 filename: getApiLogPath(),
                 category: apisLog,
-                maxLogSize: 500480,
-                backups: 5
+                maxLogSize: maxLogSize,
+                backups: maxBackups
             }
         },
         categories: {
@@ -935,7 +953,8 @@ const utils = {
     getOldestTimestamp: getOldestTimestamp,
     replaceAll: replaceAll,
     reset: reset,
-    getUserAgent: getUserAgent
+    getUserAgent: getUserAgent,
+    getEnvNumericValue: getEnvNumericValue
 };
 
 module.exports = utils;
diff --git a/authoring-api/package.json b/authoring-api/package.json
index 3690330..5a925b4 100644
--- a/authoring-api/package.json
+++ b/authoring-api/package.json
@@ -1,7 +1,7 @@
 {
   "name": "wchtools-api",
   "description": "Tools API for IBM Watson Content Hub",
-  "version": "4.0.1",
+  "version": "4.0.3",
   "keywords": [
     "api",
     "tools"
diff --git a/package.json b/package.json
index 256496e..cbf159b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prod-tools",
-  "version": "4.0.1",
+  "version": "4.0.3",
   "author": "IBM Corporation",
   "license": "Apache-2.0",
   "bugs": {