diff --git a/data.c b/data.c
index 5e6bcac..97cf8b4 100644
--- a/data.c
+++ b/data.c
@@ -545,7 +545,7 @@ int timeline_add(snac *snac, char *id, char *o_msg, char *parent, char *referrer
         "\"children\":     [],"
         "\"liked_by\":     [],"
         "\"announced_by\": [],"
-        "\"version\":      \"snac/2.x\","
+        "\"version\":      \"" USER_AGENT "\","
         "\"referrer\":     null,"
         "\"parent\":       null"
     "}");
diff --git a/http.c b/http.c
index c57714d..7c9b598 100644
--- a/http.c
+++ b/http.c
@@ -90,7 +90,7 @@ d_char *http_signed_request(snac *snac, char *method, char *url,
     hdrs = xs_dict_append(hdrs, "signature",    signature);
     hdrs = xs_dict_append(hdrs, "digest",       digest);
     hdrs = xs_dict_append(hdrs, "host",         host);
-    hdrs = xs_dict_append(hdrs, "user-agent",   "snac/2.x");
+    hdrs = xs_dict_append(hdrs, "user-agent",   USER_AGENT);
 
     response = xs_http_request(method, url, hdrs,
                            body, b_size, status, payload, p_size);
diff --git a/httpd.c b/httpd.c
index 5b26122..13591a1 100644
--- a/httpd.c
+++ b/httpd.c
@@ -158,7 +158,7 @@ void httpd_connection(int rs)
         ctype = "text/html; charset=utf-8";
 
     headers = xs_dict_append(headers, "content-type", ctype);
-    headers = xs_dict_append(headers, "x-creator",    "snac/2.x");
+    headers = xs_dict_append(headers, "x-creator",    USER_AGENT);
 
     if (b_size == 0 && body != NULL)
         b_size = strlen(body);
diff --git a/snac.h b/snac.h
index 3e83be0..2b76939 100644
--- a/snac.h
+++ b/snac.h
@@ -1,6 +1,10 @@
 /* snac - A simple, minimalistic ActivityPub instance */
 /* copyright (c) 2022 grunfink - MIT license */
 
+#define VERSION "2.0001"
+
+#define USER_AGENT "snac/" VERSION
+
 extern d_char *srv_basedir;
 extern d_char *srv_config;
 extern d_char *srv_baseurl;