diff --git a/Cargo.lock b/Cargo.lock
index 7c15040c17..f20051e8b4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3477,7 +3477,7 @@ dependencies = [
  "rand_chacha 0.3.1",
  "schemars",
  "serde",
- "serde_json",
+ "serde-json-wasm",
  "serde_repr",
  "thiserror",
  "time 0.3.17",
diff --git a/common/cosmwasm-smart-contracts/mixnet-contract/Cargo.toml b/common/cosmwasm-smart-contracts/mixnet-contract/Cargo.toml
index 670c993554..7dd3e6db58 100644
--- a/common/cosmwasm-smart-contracts/mixnet-contract/Cargo.toml
+++ b/common/cosmwasm-smart-contracts/mixnet-contract/Cargo.toml
@@ -10,13 +10,15 @@ repository = { workspace = true }
 
 [dependencies]
 bs58 = "0.4.0"
-cosmwasm-std = "1.0.0"
+cosmwasm-std = "=1.0.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_repr = "0.1"
 schemars = "0.8"
 thiserror = "1.0"
 contracts-common = { path = "../contracts-common", package = "nym-contracts-common", version = "0.2.0" }
-serde_json = "1.0.0"
+# use 0.4.1 as that's the version used by cosmwasm-std 1.0.0
+# (and ideally we don't want to pull the same dependency twice)
+serde-json-wasm = "=0.4.1"
 humantime-serde = "1.1.1"
 
 # TO CHECK WHETHER STILL NEEDED:
diff --git a/common/cosmwasm-smart-contracts/mixnet-contract/src/gateway.rs b/common/cosmwasm-smart-contracts/mixnet-contract/src/gateway.rs
index 3ba030a5b3..550660b8eb 100644
--- a/common/cosmwasm-smart-contracts/mixnet-contract/src/gateway.rs
+++ b/common/cosmwasm-smart-contracts/mixnet-contract/src/gateway.rs
@@ -128,7 +128,7 @@ pub struct GatewayConfigUpdate {
 
 impl GatewayConfigUpdate {
     pub fn to_inline_json(&self) -> String {
-        serde_json::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
+        serde_json_wasm::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
     }
 }
 
diff --git a/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs b/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs
index 90dacbea30..b2f98f3259 100644
--- a/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs
+++ b/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs
@@ -542,7 +542,7 @@ pub struct MixNodeCostParams {
 
 impl MixNodeCostParams {
     pub fn to_inline_json(&self) -> String {
-        serde_json::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
+        serde_json_wasm::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
     }
 }
 
@@ -636,7 +636,7 @@ pub struct MixNodeConfigUpdate {
 
 impl MixNodeConfigUpdate {
     pub fn to_inline_json(&self) -> String {
-        serde_json::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
+        serde_json_wasm::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
     }
 }
 
diff --git a/common/cosmwasm-smart-contracts/mixnet-contract/src/reward_params.rs b/common/cosmwasm-smart-contracts/mixnet-contract/src/reward_params.rs
index 713a70468b..74777eb99f 100644
--- a/common/cosmwasm-smart-contracts/mixnet-contract/src/reward_params.rs
+++ b/common/cosmwasm-smart-contracts/mixnet-contract/src/reward_params.rs
@@ -70,7 +70,7 @@ pub struct IntervalRewardParams {
 
 impl IntervalRewardParams {
     pub fn to_inline_json(&self) -> String {
-        serde_json::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
+        serde_json_wasm::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
     }
 }
 
@@ -282,6 +282,6 @@ impl IntervalRewardingParamsUpdate {
     }
 
     pub fn to_inline_json(&self) -> String {
-        serde_json::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
+        serde_json_wasm::to_string(self).unwrap_or_else(|_| "serialisation failure".into())
     }
 }
diff --git a/nym-wallet/Cargo.lock b/nym-wallet/Cargo.lock
index 2c1cdd58d5..4b78f3ee05 100644
--- a/nym-wallet/Cargo.lock
+++ b/nym-wallet/Cargo.lock
@@ -2912,7 +2912,7 @@ dependencies = [
  "nym-contracts-common",
  "schemars",
  "serde",
- "serde_json",
+ "serde-json-wasm",
  "serde_repr",
  "thiserror",
  "time",