diff --git a/Cargo.lock b/Cargo.lock
index 7f847ef..7e3bab9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -54,7 +54,7 @@ checksum = "b486ce3ccf7ffd79fdeb678eac06a9e6c09fc88d33836340becb8fffe87c5e33"
 
 [[package]]
 name = "evalexpr"
-version = "5.1.0"
+version = "5.1.1-alpha.0"
 dependencies = [
  "rand",
  "rand_pcg",
diff --git a/Cargo.toml b/Cargo.toml
index 3172117..0340fa4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "evalexpr"
-version = "5.1.0"
+version = "5.1.1-alpha.0"
 description = "A powerful arithmetic and boolean expression evaluator"
 keywords = ["expression", "evaluate", "evaluator", "arithmetic", "boolean"]
 categories = ["parsing", "game-engines"]