diff --git a/Cargo.lock b/Cargo.lock
index 032102e4..f3ef00c3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -20,7 +20,7 @@ dependencies = [
 
 [[package]]
 name = "block-padding"
-version = "0.4.0-pre.4"
+version = "0.4.0-rc.0"
 dependencies = [
  "hybrid-array",
 ]
diff --git a/block-padding/Cargo.toml b/block-padding/Cargo.toml
index 9c158fab..749e6959 100644
--- a/block-padding/Cargo.toml
+++ b/block-padding/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "block-padding"
-version = "0.4.0-pre.4"
+version = "0.4.0-rc.0"
 description = "Padding and unpadding of messages divided into blocks."
 authors = ["RustCrypto Developers"]
 license = "MIT OR Apache-2.0"
diff --git a/inout/Cargo.toml b/inout/Cargo.toml
index fea9f730..ec828bf8 100644
--- a/inout/Cargo.toml
+++ b/inout/Cargo.toml
@@ -12,7 +12,7 @@ keywords = ["custom-reference"]
 readme = "README.md"
 
 [dependencies]
-block-padding = { version = "=0.4.0-pre.4", path = "../block-padding", optional = true }
+block-padding = { version = "0.4.0-rc.0", path = "../block-padding", optional = true }
 hybrid-array = "0.2.0-rc.9"
 
 [features]