diff --git a/CMakeLists.txt b/CMakeLists.txt
index d25404e27..1cae58c8f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,8 +137,8 @@ endif()
 
 # set up versioning.
 set(DF_VERSION "0.43.05")
-SET(DFHACK_RELEASE "alpha0")
-SET(DFHACK_PRERELEASE FALSE)
+SET(DFHACK_RELEASE "alpha1")
+SET(DFHACK_PRERELEASE TRUE)
 
 set(DFHACK_VERSION "${DF_VERSION}-${DFHACK_RELEASE}")