diff --git a/dns/Cargo.toml b/dns/Cargo.toml
index 670338b4..6b790ea0 100644
--- a/dns/Cargo.toml
+++ b/dns/Cargo.toml
@@ -24,3 +24,6 @@ std = [
     "scale-info/std",
 ]
 ink-as-dependency = []
+
+[profile.release]
+opt-level = "z"
diff --git a/erc1155/Cargo.toml b/erc1155/Cargo.toml
index e54b8754..15ab2f7b 100644
--- a/erc1155/Cargo.toml
+++ b/erc1155/Cargo.toml
@@ -24,3 +24,6 @@ std = [
     "scale-info/std",
 ]
 ink-as-dependency = []
+
+[profile.release]
+opt-level = "z"
diff --git a/erc20/Cargo.toml b/erc20/Cargo.toml
index 4ecf5d64..6a557264 100644
--- a/erc20/Cargo.toml
+++ b/erc20/Cargo.toml
@@ -28,3 +28,6 @@ std = [
 ]
 ink-as-dependency = []
 e2e-tests = []
+
+[profile.release]
+opt-level = "z"
diff --git a/erc721/Cargo.toml b/erc721/Cargo.toml
index f4747baa..48e1d075 100644
--- a/erc721/Cargo.toml
+++ b/erc721/Cargo.toml
@@ -24,3 +24,6 @@ std = [
     "scale-info/std",
 ]
 ink-as-dependency = []
+
+[profile.release]
+opt-level = "z"
diff --git a/multisig/Cargo.toml b/multisig/Cargo.toml
index 30c8d135..7e5376c1 100755
--- a/multisig/Cargo.toml
+++ b/multisig/Cargo.toml
@@ -24,3 +24,6 @@ std = [
     "scale-info/std",
 ]
 ink-as-dependency = []
+
+[profile.release]
+opt-level = "z"
diff --git a/trait-erc20/Cargo.toml b/trait-erc20/Cargo.toml
index 67512264..ee8a11de 100644
--- a/trait-erc20/Cargo.toml
+++ b/trait-erc20/Cargo.toml
@@ -24,3 +24,6 @@ std = [
     "scale-info/std",
 ]
 ink-as-dependency = []
+
+[profile.release]
+opt-level = "z"