diff --git a/api/src/diag/ComponentLogger.ts b/api/src/diag/ComponentLogger.ts
index 2253501863..e8dba551fd 100644
--- a/api/src/diag/ComponentLogger.ts
+++ b/api/src/diag/ComponentLogger.ts
@@ -33,23 +33,23 @@ export class DiagComponentLogger implements DiagLogger {
     this._namespace = props.namespace || 'DiagComponentLogger';
   }
 
-  public debug(...args: any[]): void {
+  public debug(...args: Parameters<DiagLogFunction>): void {
     return logProxy('debug', this._namespace, args);
   }
 
-  public error(...args: any[]): void {
+  public error(...args: Parameters<DiagLogFunction>): void {
     return logProxy('error', this._namespace, args);
   }
 
-  public info(...args: any[]): void {
+  public info(...args: Parameters<DiagLogFunction>): void {
     return logProxy('info', this._namespace, args);
   }
 
-  public warn(...args: any[]): void {
+  public warn(...args: Parameters<DiagLogFunction>): void {
     return logProxy('warn', this._namespace, args);
   }
 
-  public verbose(...args: any[]): void {
+  public verbose(...args: Parameters<DiagLogFunction>): void {
     return logProxy('verbose', this._namespace, args);
   }
 }
@@ -57,7 +57,7 @@ export class DiagComponentLogger implements DiagLogger {
 function logProxy(
   funcName: keyof DiagLogger,
   namespace: string,
-  args: any
+  args: Parameters<DiagLogFunction>
 ): void {
   const logger = getGlobal('diag');
   // shortcut if logger not set
@@ -66,5 +66,5 @@ function logProxy(
   }
 
   args.unshift(namespace);
-  return logger[funcName](...(args as Parameters<DiagLogFunction>));
+  return logger[funcName](...args);
 }
diff --git a/api/src/propagation/TextMapPropagator.ts b/api/src/propagation/TextMapPropagator.ts
index 7cb41432cb..6050f37141 100644
--- a/api/src/propagation/TextMapPropagator.ts
+++ b/api/src/propagation/TextMapPropagator.ts
@@ -27,7 +27,7 @@ import { Context } from '../context/types';
  * usually implemented via library-specific request interceptors, where the
  * client-side injects values and the server-side extracts them.
  */
-export interface TextMapPropagator<Carrier = any> {
+export interface TextMapPropagator<Carrier> {
   /**
    * Injects values from a given `Context` into a carrier.
    *
@@ -75,7 +75,7 @@ export interface TextMapPropagator<Carrier = any> {
  * A setter is specified by the caller to define a specific method
  * to set key/value pairs on the carrier within a propagator.
  */
-export interface TextMapSetter<Carrier = any> {
+export interface TextMapSetter<Carrier> {
   /**
    * Callback used to set a key/value pair on an object.
    *
@@ -93,7 +93,7 @@ export interface TextMapSetter<Carrier = any> {
  * A getter is specified by the caller to define a specific method
  * to get the value of a key from a carrier.
  */
-export interface TextMapGetter<Carrier = any> {
+export interface TextMapGetter<Carrier> {
   /**
    * Get a list of all keys available on the carrier.
    *
diff --git a/api/src/trace/NoopTracer.ts b/api/src/trace/NoopTracer.ts
index 0656429b86..9ec0d11c34 100644
--- a/api/src/trace/NoopTracer.ts
+++ b/api/src/trace/NoopTracer.ts
@@ -99,7 +99,7 @@ export class NoopTracer implements Tracer {
   }
 }
 
-function isSpanContext(spanContext: any): spanContext is SpanContext {
+function isSpanContext(spanContext: SpanContext): spanContext is SpanContext {
   return (
     typeof spanContext === 'object' &&
     typeof spanContext['spanId'] === 'string' &&