diff --git a/Cargo.toml b/Cargo.toml
index 15e5112d5..3af94700f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat"
-version = "0.1.0"
+version = "1.0.0-alpha.0"
 authors = ["dignifiedquire <dignifiedquire@gmail.com>"]
 edition = "2018"
 
diff --git a/deltachat-ffi/Cargo.toml b/deltachat-ffi/Cargo.toml
index ee8d9133a..0026c82c5 100644
--- a/deltachat-ffi/Cargo.toml
+++ b/deltachat-ffi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat_ffi"
-version = "0.1.0"
+version = "1.0.0-alpha.0"
 description = "Deltachat FFI"
 authors = ["dignifiedquire <dignifiedquire@gmail.com>"]
 edition = "2018"
diff --git a/deltachat-ffi/deltachat.h b/deltachat-ffi/deltachat.h
index 5b55cef34..e73ac7ec5 100644
--- a/deltachat-ffi/deltachat.h
+++ b/deltachat-ffi/deltachat.h
@@ -11,9 +11,6 @@ extern "C" {
 #endif
 
 
-#define DC_VERSION_STR "0.43.0"
-
-
 /**
  * @mainpage Getting started
  *
diff --git a/deltachat-ffi/src/lib.rs b/deltachat-ffi/src/lib.rs
index 3d9473e07..ccae8e24c 100644
--- a/deltachat-ffi/src/lib.rs
+++ b/deltachat-ffi/src/lib.rs
@@ -12,8 +12,6 @@ extern crate human_panic;
 
 use deltachat::*;
 
-pub const DC_VERSION_STR: &'static str = "0.43.0\x00";
-
 // TODO: constants
 
 // dc_context_t
diff --git a/src/constants.rs b/src/constants.rs
index dc51bb2c9..ce9b17aba 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -1,6 +1,6 @@
 //! Constants
 
-pub const VERSION: &'static [u8; 7] = b"0.43.0\x00";
+pub const DC_VERSION_STR: &'static [u8; 14] = b"1.0.0-alpha.0\x00";
 
 pub const DC_MOVE_STATE_MOVING: u32 = 3;
 pub const DC_MOVE_STATE_STAY: u32 = 2;
diff --git a/src/context.rs b/src/context.rs
index 822faa185..47cf0aa1b 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -549,7 +549,7 @@ static mut sys_config_keys: [*const libc::c_char; 3] = [
 
 unsafe fn get_sys_config_str(key: *const libc::c_char) -> *mut libc::c_char {
     if strcmp(key, b"sys.version\x00" as *const u8 as *const libc::c_char) == 0 {
-        return dc_strdup(VERSION as *const u8 as *const libc::c_char);
+        return dc_strdup(DC_VERSION_STR as *const u8 as *const libc::c_char);
     } else if strcmp(
         key,
         b"sys.msgsize_max_recommended\x00" as *const u8 as *const libc::c_char,
@@ -755,7 +755,7 @@ pub unsafe fn dc_get_info(context: &Context) -> *mut libc::c_char {
          public_key_count={}\n\
          fingerprint={}\n\
          level=awesome\n",
-        to_str(VERSION as *const u8 as *const _),
+        to_str(DC_VERSION_STR as *const u8 as *const _),
         to_str(libsqlite3_sys::SQLITE_VERSION as *const u8 as *const libc::c_char),
         sqlite3_threadsafe(),
         // arch
@@ -809,7 +809,7 @@ pub unsafe fn dc_get_info(context: &Context) -> *mut libc::c_char {
 }
 
 pub unsafe fn dc_get_version_str() -> *mut libc::c_char {
-    dc_strdup(VERSION as *const u8 as *const libc::c_char)
+    dc_strdup(DC_VERSION_STR as *const u8 as *const libc::c_char)
 }
 
 pub unsafe fn dc_get_fresh_msgs(context: &Context) -> *mut dc_array_t {
diff --git a/src/dc_mimefactory.rs b/src/dc_mimefactory.rs
index baa659fef..c5cbe070e 100644
--- a/src/dc_mimefactory.rs
+++ b/src/dc_mimefactory.rs
@@ -8,7 +8,7 @@ use mmime::mailmime_write_mem::*;
 use mmime::mmapstring::*;
 use mmime::other::*;
 
-use crate::constants::VERSION;
+use crate::constants::DC_VERSION_STR;
 use crate::context::Context;
 use crate::dc_chat::*;
 use crate::dc_contact::*;
@@ -464,7 +464,7 @@ pub unsafe fn dc_mimefactory_render(mut factory: *mut dc_mimefactory_t) -> libc:
                 strdup(b"X-Mailer\x00" as *const u8 as *const libc::c_char),
                 dc_mprintf(
                     b"Delta Chat Core %s%s%s\x00" as *const u8 as *const libc::c_char,
-                    VERSION as *const u8 as *const libc::c_char,
+                    DC_VERSION_STR as *const u8 as *const libc::c_char,
                     if !(*(*factory).context).os_name.is_null() {
                         b"/\x00" as *const u8 as *const libc::c_char
                     } else {
@@ -957,7 +957,7 @@ pub unsafe fn dc_mimefactory_render(mut factory: *mut dc_mimefactory_t) -> libc:
             message_text2 =
                 dc_mprintf(b"Reporting-UA: Delta Chat %s\r\nOriginal-Recipient: rfc822;%s\r\nFinal-Recipient: rfc822;%s\r\nOriginal-Message-ID: <%s>\r\nDisposition: manual-action/MDN-sent-automatically; displayed\r\n\x00"
                                as *const u8 as *const libc::c_char,
-                           VERSION as *const u8 as *const libc::c_char,
+                           DC_VERSION_STR as *const u8 as *const libc::c_char,
                            (*factory).from_addr, (*factory).from_addr,
                            (*(*factory).msg).rfc724_mid);
             let content_type_0: *mut mailmime_content = mailmime_content_new_with_str(