diff --git a/src/chains/ethereum/ethereum/package-lock.json b/src/chains/ethereum/ethereum/package-lock.json
index f5ffbdffd3..fe4e52e7f2 100644
--- a/src/chains/ethereum/ethereum/package-lock.json
+++ b/src/chains/ethereum/ethereum/package-lock.json
@@ -838,9 +838,9 @@
 			"dev": true
 		},
 		"@trufflesuite/uws-js-unofficial": {
-			"version": "20.4.0-unofficial.3",
-			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.3.tgz",
-			"integrity": "sha512-RvEMJ3SWrBekUhZobGHmUU1hZPeuUMOQd3pPEauU/EauqJNv/KCKJdvfuX++CpSM246I0Qun9wBHoUh1xxWqUg==",
+			"version": "20.4.0-unofficial.4",
+			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.4.tgz",
+			"integrity": "sha512-XTfdNdgp2X4ryXOg7Ofva/r0WXrQeiH+kV+v+FmQv4Sauf9g5RVv/7TPEmo7xvc9sz74Jb+C7vcmcxXcS8D5Wg==",
 			"dev": true,
 			"requires": {
 				"bufferutil": "4.0.5",
diff --git a/src/chains/ethereum/ethereum/package.json b/src/chains/ethereum/ethereum/package.json
index 17cacf0468..ce4f986c25 100644
--- a/src/chains/ethereum/ethereum/package.json
+++ b/src/chains/ethereum/ethereum/package.json
@@ -86,7 +86,7 @@
     "ws": "8.2.3"
   },
   "devDependencies": {
-    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.3",
+    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.4",
     "@types/encoding-down": "5.0.0",
     "@types/fs-extra": "9.0.2",
     "@types/keccak": "3.0.1",
diff --git a/src/chains/filecoin/filecoin/package-lock.json b/src/chains/filecoin/filecoin/package-lock.json
index b2be52c6b7..def80c7487 100644
--- a/src/chains/filecoin/filecoin/package-lock.json
+++ b/src/chains/filecoin/filecoin/package-lock.json
@@ -845,9 +845,9 @@
 			"integrity": "sha512-OvjF+z51L3ov0OyAU0duzsYuvO01PH7x4t6DJx+guahgTnBHkhJdG7soQeTSFLWN3efnHyibZ4Z8l2EuWwJN3A=="
 		},
 		"@trufflesuite/uws-js-unofficial": {
-			"version": "20.4.0-unofficial.3",
-			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.3.tgz",
-			"integrity": "sha512-RvEMJ3SWrBekUhZobGHmUU1hZPeuUMOQd3pPEauU/EauqJNv/KCKJdvfuX++CpSM246I0Qun9wBHoUh1xxWqUg==",
+			"version": "20.4.0-unofficial.4",
+			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.4.tgz",
+			"integrity": "sha512-XTfdNdgp2X4ryXOg7Ofva/r0WXrQeiH+kV+v+FmQv4Sauf9g5RVv/7TPEmo7xvc9sz74Jb+C7vcmcxXcS8D5Wg==",
 			"dev": true,
 			"requires": {
 				"bufferutil": "4.0.5",
diff --git a/src/chains/filecoin/filecoin/package.json b/src/chains/filecoin/filecoin/package.json
index 2b8a8ccacd..ebca84cd47 100644
--- a/src/chains/filecoin/filecoin/package.json
+++ b/src/chains/filecoin/filecoin/package.json
@@ -59,7 +59,7 @@
     "@filecoin-shipyard/lotus-client-schema": "2.0.0",
     "@ganache/filecoin-options": "0.1.4",
     "@ganache/utils": "0.1.4",
-    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.3",
+    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.4",
     "@types/bn.js": "5.1.0",
     "@types/deep-equal": "1.0.1",
     "@types/levelup": "4.3.0",
diff --git a/src/chains/tezos/tezos/package-lock.json b/src/chains/tezos/tezos/package-lock.json
index 4882a68589..ab1ef77a51 100644
--- a/src/chains/tezos/tezos/package-lock.json
+++ b/src/chains/tezos/tezos/package-lock.json
@@ -35,9 +35,9 @@
 			"dev": true
 		},
 		"@trufflesuite/uws-js-unofficial": {
-			"version": "20.4.0-unofficial.3",
-			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.3.tgz",
-			"integrity": "sha512-RvEMJ3SWrBekUhZobGHmUU1hZPeuUMOQd3pPEauU/EauqJNv/KCKJdvfuX++CpSM246I0Qun9wBHoUh1xxWqUg==",
+			"version": "20.4.0-unofficial.4",
+			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.4.tgz",
+			"integrity": "sha512-XTfdNdgp2X4ryXOg7Ofva/r0WXrQeiH+kV+v+FmQv4Sauf9g5RVv/7TPEmo7xvc9sz74Jb+C7vcmcxXcS8D5Wg==",
 			"dev": true,
 			"requires": {
 				"bufferutil": "4.0.5",
diff --git a/src/chains/tezos/tezos/package.json b/src/chains/tezos/tezos/package.json
index 01df0c99b1..9ae63bf12a 100644
--- a/src/chains/tezos/tezos/package.json
+++ b/src/chains/tezos/tezos/package.json
@@ -47,7 +47,7 @@
     "emittery": "0.10.0"
   },
   "devDependencies": {
-    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.3",
+    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.4",
     "@types/mocha": "9.0.0",
     "cheerio": "1.0.0-rc.3",
     "cross-env": "7.0.3",
diff --git a/src/packages/core/package-lock.json b/src/packages/core/package-lock.json
index 757c9635d4..cc753e7cab 100644
--- a/src/packages/core/package-lock.json
+++ b/src/packages/core/package-lock.json
@@ -436,9 +436,9 @@
 			"dev": true
 		},
 		"@trufflesuite/uws-js-unofficial": {
-			"version": "20.4.0-unofficial.3",
-			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.3.tgz",
-			"integrity": "sha512-RvEMJ3SWrBekUhZobGHmUU1hZPeuUMOQd3pPEauU/EauqJNv/KCKJdvfuX++CpSM246I0Qun9wBHoUh1xxWqUg==",
+			"version": "20.4.0-unofficial.4",
+			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.4.tgz",
+			"integrity": "sha512-XTfdNdgp2X4ryXOg7Ofva/r0WXrQeiH+kV+v+FmQv4Sauf9g5RVv/7TPEmo7xvc9sz74Jb+C7vcmcxXcS8D5Wg==",
 			"requires": {
 				"bufferutil": "4.0.5",
 				"utf-8-validate": "5.0.7",
diff --git a/src/packages/core/package.json b/src/packages/core/package.json
index 5c7d677f2b..a361765077 100644
--- a/src/packages/core/package.json
+++ b/src/packages/core/package.json
@@ -53,7 +53,7 @@
     "@ganache/options": "0.1.4",
     "@ganache/tezos": "0.1.4",
     "@ganache/utils": "0.1.4",
-    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.3",
+    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.4",
     "aggregate-error": "3.1.0",
     "emittery": "0.10.0",
     "promise.allsettled": "1.0.4"
diff --git a/src/packages/core/tests/server.test.ts b/src/packages/core/tests/server.test.ts
index 8c1836dd9f..c84fef36e1 100644
--- a/src/packages/core/tests/server.test.ts
+++ b/src/packages/core/tests/server.test.ts
@@ -393,7 +393,7 @@ describe("server", () => {
       }
     });
 
-    it("closes even if an http connection with keep-alive is open", async () => {
+    it("closes even if a persistent http connection is open", async () => {
       const agent = new http.Agent({
         keepAlive: true
       });
@@ -410,12 +410,46 @@ describe("server", () => {
         // open the http connection
         await post("localhost", port, jsonRpcJson, agent);
 
-        s.close();
+        await s.close();
         // a request is required in order to actually close the connection
         await post("localhost", port, jsonRpcJson, agent);
 
         // connection has now closed, allowing ganache to close
-        await assert.rejects(post("localhost", port, jsonRpcJson, agent));
+        await assert.rejects(post("localhost", port, jsonRpcJson, agent), {
+          code: "ECONNREFUSED"
+        });
+      } finally {
+        teardown();
+      }
+    });
+
+    it("refuses new connections when waiting on persistent connections to close", async () => {
+      const agent = new http.Agent({
+        keepAlive: true
+      });
+
+      await setup();
+      const jsonRpcJson: any = {
+        jsonrpc: "2.0",
+        id: "1",
+        method: "eth_block_number",
+        params: []
+      };
+
+      try {
+        // open the http connection
+        await post("localhost", port, jsonRpcJson, agent);
+
+        await s.close();
+
+        // this connection is on a different connection, so should fail
+        await assert.rejects(post("localhost", port, jsonRpcJson), {
+          code: "ECONNREFUSED"
+        });
+
+        // a request is required in order to actually close the connection
+        await post("localhost", port, jsonRpcJson, agent);
+
       } finally {
         teardown();
       }
diff --git a/src/packages/utils/package-lock.json b/src/packages/utils/package-lock.json
index 101bdefdb6..44c9de319a 100644
--- a/src/packages/utils/package-lock.json
+++ b/src/packages/utils/package-lock.json
@@ -72,9 +72,9 @@
 			}
 		},
 		"@trufflesuite/uws-js-unofficial": {
-			"version": "20.4.0-unofficial.3",
-			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.3.tgz",
-			"integrity": "sha512-RvEMJ3SWrBekUhZobGHmUU1hZPeuUMOQd3pPEauU/EauqJNv/KCKJdvfuX++CpSM246I0Qun9wBHoUh1xxWqUg==",
+			"version": "20.4.0-unofficial.4",
+			"resolved": "https://registry.npmjs.org/@trufflesuite/uws-js-unofficial/-/uws-js-unofficial-20.4.0-unofficial.4.tgz",
+			"integrity": "sha512-XTfdNdgp2X4ryXOg7Ofva/r0WXrQeiH+kV+v+FmQv4Sauf9g5RVv/7TPEmo7xvc9sz74Jb+C7vcmcxXcS8D5Wg==",
 			"dev": true,
 			"requires": {
 				"bufferutil": "4.0.5",
diff --git a/src/packages/utils/package.json b/src/packages/utils/package.json
index 3965f02e70..2feea19a4d 100644
--- a/src/packages/utils/package.json
+++ b/src/packages/utils/package.json
@@ -52,7 +52,7 @@
     "seedrandom": "3.0.5"
   },
   "devDependencies": {
-    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.3",
+    "@trufflesuite/uws-js-unofficial": "20.4.0-unofficial.4",
     "@types/mocha": "9.0.0",
     "@types/seedrandom": "3.0.1",
     "cross-env": "7.0.3",