diff --git a/examples/graph/Cargo.toml b/examples/graph/Cargo.toml
index fced8799..5f02b245 100644
--- a/examples/graph/Cargo.toml
+++ b/examples/graph/Cargo.toml
@@ -9,7 +9,7 @@ build = "build.rs"
 qmetaobject = { path = "../../qmetaobject"}
 qttypes = { path = "../../qttypes"} # required to get the DEP_QT_* env variables
 cstr = "0.2"
-cpp = "0.5"
+cpp = "0.5.6"
 
 [build-dependencies]
-cpp_build = "0.5"
+cpp_build = "0.5.6"
diff --git a/qmetaobject/Cargo.toml b/qmetaobject/Cargo.toml
index 1fd505f3..78830e5a 100644
--- a/qmetaobject/Cargo.toml
+++ b/qmetaobject/Cargo.toml
@@ -20,12 +20,12 @@ webengine = ["qttypes/qtwebengine"]
 qttypes = { path = "../qttypes", version = "0.2.1", features = ["qtquick"] }
 qmetaobject_impl = { path = "../qmetaobject_impl", version = "=0.2.1"}
 lazy_static = "1.0"
-cpp = "0.5.4"
+cpp = "0.5.6"
 log = { version = "0.4", optional = true }
 
 [build-dependencies]
-cpp_build = "0.5.4"
-semver = "0.11"
+cpp_build = "0.5.6"
+semver = "1"
 
 [dev-dependencies]
 cstr = "0.2"
@@ -34,4 +34,3 @@ tempfile = "^3"
 
 [package.metadata.docs.rs]
 dependencies = [ "qtbase5-dev", "qtdeclarative5-dev" ]
-