diff --git a/doc/api/n-api.md b/doc/api/n-api.md
index f5b07532d1d631..4e15e17603e30a 100644
--- a/doc/api/n-api.md
+++ b/doc/api/n-api.md
@@ -171,7 +171,7 @@ This is an opaque pointer that is used to represent a JavaScript value.
 
 ### napi_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 This is an opaque pointer that represents a JavaScript function which can be
 called asynchronously from multiple threads via
@@ -179,7 +179,7 @@ called asynchronously from multiple threads via
 
 ### napi_threadsafe_function_release_mode
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 A value to be given to `napi_release_threadsafe_function()` to indicate whether
 the thread-safe function is to be closed immediately (`napi_tsfn_abort`) or
@@ -194,7 +194,7 @@ typedef enum {
 
 ### napi_threadsafe_function_call_mode
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 A value to be given to `napi_call_threadsafe_function()` to indicate whether
 the call should block whenever the queue associated with the thread-safe
@@ -285,7 +285,7 @@ typedef void (*napi_async_complete_callback)(napi_env env,
 
 #### napi_threadsafe_function_call_js
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 Function pointer used with asynchronous thread-safe function calls. The callback
 will be called on the main thread. Its purpose is to use a data item arriving
@@ -4184,7 +4184,7 @@ prevent the event loop from exiting. The APIs `napi_ref_threadsafe_function` and
 
 ### napi_create_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
@@ -4227,7 +4227,7 @@ parameters and with `undefined` as its `this` value.
 
 ### napi_get_threadsafe_function_context
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
@@ -4245,7 +4245,7 @@ This API may be called from any thread which makes use of `func`.
 
 ### napi_call_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
@@ -4273,7 +4273,7 @@ This API may be called from any thread which makes use of `func`.
 
 ### napi_acquire_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
@@ -4295,7 +4295,7 @@ This API may be called from any thread which will start making use of `func`.
 
 ### napi_release_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
@@ -4323,7 +4323,7 @@ This API may be called from any thread which will stop making use of `func`.
 
 ### napi_ref_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
@@ -4344,7 +4344,7 @@ This API may only be called from the main thread.
 
 ### napi_unref_threadsafe_function
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 <!-- YAML
 added: REPLACEME
diff --git a/src/node_api.h b/src/node_api.h
index 8a17c95afdde11..f683f8d51b7cd8 100644
--- a/src/node_api.h
+++ b/src/node_api.h
@@ -3,9 +3,6 @@
 
 #include <stddef.h>
 #include <stdbool.h>
-#include "node_api_types.h"
-
-struct uv_loop_s;  // Forward declaration.
 
 #ifndef NAPI_VERSION
 #ifdef NAPI_EXPERIMENTAL
@@ -13,10 +10,14 @@ struct uv_loop_s;  // Forward declaration.
 #define NAPI_VERSION 2147483647
 #else
 // The baseline version for N-API
-#define NAPI_VERSION 3
+#define NAPI_VERSION 4
 #endif
 #endif
 
+#include "node_api_types.h"
+
+struct uv_loop_s;  // Forward declaration.
+
 #ifdef _WIN32
   #ifdef BUILDING_NODE_EXTENSION
     #ifdef EXTERNAL_NAPI
@@ -614,7 +615,7 @@ NAPI_EXTERN napi_status napi_remove_env_cleanup_hook(napi_env env,
 
 #endif  // NAPI_VERSION >= 3
 
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION >= 4
 
 // Calling into JS from other threads
 NAPI_EXTERN napi_status
@@ -652,7 +653,7 @@ napi_unref_threadsafe_function(napi_env env, napi_threadsafe_function func);
 NAPI_EXTERN napi_status
 napi_ref_threadsafe_function(napi_env env, napi_threadsafe_function func);
 
-#endif  // NAPI_EXPERIMENTAL
+#endif  // NAPI_VERSION >= 4
 
 EXTERN_C_END
 
diff --git a/src/node_api_types.h b/src/node_api_types.h
index cfc2b879ab31ef..c9229c3bdd3408 100644
--- a/src/node_api_types.h
+++ b/src/node_api_types.h
@@ -20,9 +20,9 @@ typedef struct napi_callback_info__ *napi_callback_info;
 typedef struct napi_async_context__ *napi_async_context;
 typedef struct napi_async_work__ *napi_async_work;
 typedef struct napi_deferred__ *napi_deferred;
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION >= 4
 typedef struct napi_threadsafe_function__* napi_threadsafe_function;
-#endif  // NAPI_EXPERIMENTAL
+#endif  // NAPI_VERSION >= 4
 
 typedef enum {
   napi_default = 0,
@@ -76,13 +76,13 @@ typedef enum {
   napi_escape_called_twice,
   napi_handle_scope_mismatch,
   napi_callback_scope_mismatch,
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION >= 4
   napi_queue_full,
   napi_closing,
-#endif  // NAPI_EXPERIMENTAL
+#endif  // NAPI_VERSION >= 4
 } napi_status;
 
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION >= 4
 typedef enum {
   napi_tsfn_release,
   napi_tsfn_abort
@@ -92,7 +92,7 @@ typedef enum {
   napi_tsfn_nonblocking,
   napi_tsfn_blocking
 } napi_threadsafe_function_call_mode;
-#endif  // NAPI_EXPERIMENTAL
+#endif  // NAPI_VERSION >= 4
 
 typedef napi_value (*napi_callback)(napi_env env,
                                     napi_callback_info info);
@@ -105,12 +105,12 @@ typedef void (*napi_async_complete_callback)(napi_env env,
                                              napi_status status,
                                              void* data);
 
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION >= 4
 typedef void (*napi_threadsafe_function_call_js)(napi_env env,
                                                  napi_value js_callback,
                                                  void* context,
                                                  void* data);
-#endif  // NAPI_EXPERIMENTAL
+#endif  // NAPI_VERSION >= 4
 
 typedef struct {
   // One of utf8name or name should be NULL.
diff --git a/src/node_version.h b/src/node_version.h
index 5442c2ef49bc48..8d5423b1c6479f 100644
--- a/src/node_version.h
+++ b/src/node_version.h
@@ -108,6 +108,6 @@
 #define NODE_MODULE_VERSION 57
 
 // the NAPI_VERSION provided by this version of the runtime
-#define NAPI_VERSION  3
+#define NAPI_VERSION  4
 
 #endif  // SRC_NODE_VERSION_H_
diff --git a/test/addons-napi/test_general/test.js b/test/addons-napi/test_general/test.js
index 4faf508d5db145..03c284bae53869 100644
--- a/test/addons-napi/test_general/test.js
+++ b/test/addons-napi/test_general/test.js
@@ -33,8 +33,8 @@ assert.notStrictEqual(test_general.testGetPrototype(baseObject),
                       test_general.testGetPrototype(extendedObject));
 
 // test version management functions
-// expected version is currently 3
-assert.strictEqual(test_general.testGetVersion(), 3);
+// expected version is currently 4
+assert.strictEqual(test_general.testGetVersion(), 4);
 
 const [ major, minor, patch, release ] = test_general.testGetNodeVersion();
 assert.strictEqual(process.version.split('-')[0],
diff --git a/test/addons-napi/test_threadsafe_function/binding.c b/test/addons-napi/test_threadsafe_function/binding.c
index 354012a288b3ca..d78710cac1317a 100644
--- a/test/addons-napi/test_threadsafe_function/binding.c
+++ b/test/addons-napi/test_threadsafe_function/binding.c
@@ -4,7 +4,6 @@
 // which, in turn, may affect the ABI stability of the project despite its use
 // of N-API.
 #include <uv.h>
-#define NAPI_EXPERIMENTAL
 #include <node_api.h>
 #include "../common.h"