diff --git a/package.json b/package.json
index 75c5eef..d8c1f37 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eppo/js-client-sdk-common",
-  "version": "4.15.2",
+  "version": "4.15.3",
   "description": "Common library for Eppo JavaScript SDKs (web, react native, and node)",
   "main": "dist/index.js",
   "files": [
diff --git a/src/application-logger.ts b/src/application-logger.ts
index a4ae490..5aa9f9c 100644
--- a/src/application-logger.ts
+++ b/src/application-logger.ts
@@ -4,8 +4,15 @@ export const loggerPrefix = '[Eppo SDK]';
 
 // Create a Pino logger instance
 export const logger = pino({
-  // eslint-disable-next-line no-restricted-globals
-  level: process.env.LOG_LEVEL ?? (process.env.NODE_ENV === 'production' ? 'warn' : 'info'),
-  // https://getpino.io/#/docs/browser
-  browser: { disabled: true },
+  // Use any specified log level, or warn in production/browser, info otherwise
+  /* eslint-disable no-restricted-globals */
+  level:
+    typeof process !== 'undefined' && process.env.LOG_LEVEL
+      ? process.env.LOG_LEVEL
+      : typeof process === 'undefined' || process.env.NODE_ENV === 'production'
+        ? 'warn'
+        : 'info',
+  /* eslint-enable no-restricted-globals */
+
+  browser: { disabled: true }, // See https://getpino.io/#/docs/browser
 });
diff --git a/src/client/eppo-client.ts b/src/client/eppo-client.ts
index e7d9c6d..5810452 100644
--- a/src/client/eppo-client.ts
+++ b/src/client/eppo-client.ts
@@ -756,14 +756,14 @@ export default class EppoClient {
 
         try {
           this.logBanditAction(banditEvent);
-        } catch (err: any) {
-          logger.error('Error logging bandit event', err);
+        } catch (err) {
+          logger.error({ err }, 'Error logging bandit event');
         }
 
         evaluationDetails.banditAction = action;
       }
     } catch (err: any) {
-      logger.error('Error determining bandit action', err);
+      logger.error({ err }, 'Error determining bandit action');
       if (!this.isGracefulFailureMode) {
         throw err;
       }
@@ -772,7 +772,7 @@ export default class EppoClient {
         // Update the flag evaluation code to indicate that
         evaluationDetails.flagEvaluationCode = 'BANDIT_ERROR';
       }
-      evaluationDetails.flagEvaluationDescription = `Error evaluating bandit action: ${err.message}`;
+      evaluationDetails.flagEvaluationDescription = `Error evaluating bandit action: ${err?.message}`;
     }
     return { variation, action, evaluationDetails };
   }
@@ -877,7 +877,7 @@ export default class EppoClient {
       // Record in the assignment cache, if active, to deduplicate subsequent repeat assignments
       this.banditAssignmentCache?.set(banditAssignmentCacheProperties);
     } catch (err) {
-      logger.warn('Error encountered logging bandit action', err);
+      logger.warn({ err }, 'Error encountered logging bandit action');
     }
   }
 
diff --git a/src/client/eppo-precomputed-client.ts b/src/client/eppo-precomputed-client.ts
index 590ed87..1909594 100644
--- a/src/client/eppo-precomputed-client.ts
+++ b/src/client/eppo-precomputed-client.ts
@@ -519,7 +519,7 @@ export default class EppoPrecomputedClient {
       // Record in the assignment cache, if active, to deduplicate subsequent repeat assignments
       this.banditAssignmentCache?.set(banditAssignmentCacheProperties);
     } catch (err) {
-      logger.warn('Error encountered logging bandit action', err);
+      logger.warn({ err }, 'Error encountered logging bandit action');
     }
   }
 
diff --git a/src/events/event-delivery.ts b/src/events/event-delivery.ts
index 310afd2..c97161a 100644
--- a/src/events/event-delivery.ts
+++ b/src/events/event-delivery.ts
@@ -33,8 +33,8 @@ export default class EventDelivery implements IEventDelivery {
       } else {
         return { failedEvents: batch };
       }
-    } catch (e: any) {
-      logger.warn(`Failed to upload event batch`, e);
+    } catch (err) {
+      logger.warn({ err }, `Failed to upload event batch`);
       return { failedEvents: batch };
     }
   }