diff --git a/embassy-stm32-examples/Cargo.toml b/embassy-stm32-examples/Cargo.toml
index fe02d19a7..799f0f9b9 100644
--- a/embassy-stm32-examples/Cargo.toml
+++ b/embassy-stm32-examples/Cargo.toml
@@ -3,6 +3,7 @@ authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
 edition = "2018"
 name = "embassy-stm32f4-examples"
 version = "0.1.0"
+resolver = "2"
 
 [features]
 default = [
diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index fc9c327f6..f25e6baf0 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -3,6 +3,7 @@ name = "embassy-stm32"
 version = "0.1.0"
 authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
 edition = "2018"
+resolver = "2"
 
 [dependencies]
 embassy = { version = "0.1.0", path = "../embassy" }
diff --git a/stm32-metapac/Cargo.toml b/stm32-metapac/Cargo.toml
index c32c66902..6c5e47e8e 100644
--- a/stm32-metapac/Cargo.toml
+++ b/stm32-metapac/Cargo.toml
@@ -3,6 +3,7 @@ name = "stm32-metapac"
 version = "0.1.0"
 edition = "2018"
 links = "stm32-metapac-v0.1"
+resolver = "2"
 
 [dependencies]
 cortex-m = "0.7.2"