diff --git a/.github/workflows/ci-contracts-upload-binaries.yml b/.github/workflows/ci-contracts-upload-binaries.yml
index c5466d75060..620012763e3 100644
--- a/.github/workflows/ci-contracts-upload-binaries.yml
+++ b/.github/workflows/ci-contracts-upload-binaries.yml
@@ -35,14 +35,14 @@ jobs:
       - name: Install Rust stable
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.69.0
+          toolchain: stable
           target: wasm32-unknown-unknown
           override: true
 
       - name: Install wasm-opt
         uses: ./.github/actions/install-wasm-opt
         with:
-          version: '112'
+          version: '114'
 
       - name: Build release contracts
         run: make contracts
diff --git a/.github/workflows/publish-nym-contracts.yml b/.github/workflows/publish-nym-contracts.yml
index f1cd855e020..03c4eddb635 100644
--- a/.github/workflows/publish-nym-contracts.yml
+++ b/.github/workflows/publish-nym-contracts.yml
@@ -14,13 +14,13 @@ jobs:
       - name: Install Rust stable
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.69.0
+          toolchain: stable
           target: wasm32-unknown-unknown
           override: true
           components: rustfmt, clippy
 
       - name: Install wasm-opt
-        run: cargo install --version 0.112.0 wasm-opt
+        run: cargo install --version 0.114.0 wasm-opt
 
       - name: Build release contracts
         run: make contracts
diff --git a/Makefile b/Makefile
index b567e3db31e..31127bc4138 100644
--- a/Makefile
+++ b/Makefile
@@ -93,10 +93,6 @@ $(eval $(call add_cargo_workspace,contracts,contracts,--lib --target wasm32-unkn
 $(eval $(call add_cargo_workspace,wallet,nym-wallet))
 $(eval $(call add_cargo_workspace,connect,nym-connect/desktop))
 
-# OVERRIDE: wasm-opt fails if the binary has been built with the latest rustc.
-# Pin to the last working version.
-contracts_BUILD_RELEASE_TOOLCHAIN := +1.69.0
-
 # -----------------------------------------------------------------------------
 # SDK
 # -----------------------------------------------------------------------------
@@ -144,7 +140,7 @@ contracts: build-release-contracts wasm-opt-contracts
 
 wasm-opt-contracts:
 	for contract in $(CONTRACTS_WASM); do \
-	  wasm-opt --disable-sign-ext -Os $(CONTRACTS_OUT_DIR)/$$contract -o $(CONTRACTS_OUT_DIR)/$$contract; \
+	  wasm-opt --signext-lowering -Os $(CONTRACTS_OUT_DIR)/$$contract -o $(CONTRACTS_OUT_DIR)/$$contract; \
 	done
 
 # Consider adding 's' to make plural consistent (beware: used in github workflow)
diff --git a/contracts/mixnet/Makefile b/contracts/mixnet/Makefile
index 01452be7010..4583495c9a9 100644
--- a/contracts/mixnet/Makefile
+++ b/contracts/mixnet/Makefile
@@ -1,5 +1,5 @@
 opt: wasm
-	wasm-opt --disable-sign-ext -Os ../target/wasm32-unknown-unknown/release/mixnet_contract.wasm -o ../target/wasm32-unknown-unknown/release/mixnet_contract.wasm
+	wasm-opt --signext-lowering -Os ../target/wasm32-unknown-unknown/release/mixnet_contract.wasm -o ../target/wasm32-unknown-unknown/release/mixnet_contract.wasm
 
 wasm:
 	RUSTFLAGS='-C link-arg=-s' cargo build --release --target wasm32-unknown-unknown