diff --git a/rust/hg-core/Cargo.toml b/rust/hg-core/Cargo.toml
--- a/rust/hg-core/Cargo.toml
+++ b/rust/hg-core/Cargo.toml
@@ -14,7 +14,7 @@ bytes-cast = "0.2"
 byteorder = "1.3.4"
 derive_more = "0.99"
 home = "0.5"
-im-rc = "15.0.*"
+im-rc = "15.0"
 itertools = "0.9"
 lazy_static = "1.4.0"
 libc = "0.2"