diff --git a/serde_codegen/Cargo.toml b/serde_codegen/Cargo.toml
index 5ded9638..c0db8f97 100644
--- a/serde_codegen/Cargo.toml
+++ b/serde_codegen/Cargo.toml
@@ -32,6 +32,6 @@ aster = { version = "^0.22.0", default-features = false }
 clippy = { version = "^0.*", optional = true }
 quasi = { version = "^0.16.0", default-features = false }
 quasi_macros = { version = "^0.16.0", optional = true }
-serde_codegen_internals = { version = "0.5.0", default-features = false }
+serde_codegen_internals = { version = "=0.5.0", default-features = false }
 syntex = { version = "^0.39.0", optional = true }
 syntex_syntax = { version = "^0.39.0", optional = true }
diff --git a/serde_macros/Cargo.toml b/serde_macros/Cargo.toml
index 78132210..aafbfe05 100644
--- a/serde_macros/Cargo.toml
+++ b/serde_macros/Cargo.toml
@@ -18,7 +18,7 @@ unstable-testing = ["clippy", "serde/unstable-testing", "serde_codegen/unstable-
 
 [dependencies]
 clippy = { version = "^0.*", optional = true }
-serde_codegen = { version = "0.8.0", default-features = false, features = ["unstable"] }
+serde_codegen = { version = "=0.8.0", default-features = false, features = ["unstable"] }
 
 [dev-dependencies]
 clippy = "^0.*"