diff --git a/scripts/updateVersion.ts b/scripts/updateVersion.ts
index 1fe8b78..7f7b712 100644
--- a/scripts/updateVersion.ts
+++ b/scripts/updateVersion.ts
@@ -59,7 +59,7 @@ function validateVersion(): string {
 function getVersion(filePath: string, regex: RegExp): string {
     const fileContents = readFileSync(filePath).toString();
     const match = fileContents.match(regex);
-    if (!match) {
+    if (!match || !match[1]) {
         throw new Error(`Failed to find match for "${regex.source}".`);
     }
     return match[1];
@@ -79,11 +79,10 @@ function updatePackageJsonVersion(cwd: string, newVersion: string) {
 function updateVersionByRegex(filePath: string, regex: RegExp, newVersion: string) {
     const oldFileContents = readFileSync(filePath).toString();
     const match = oldFileContents.match(regex);
-    if (!match) {
+    if (!match || !match[0] || !match[1]) {
         throw new Error(`Failed to find match for "${regex.source}".`);
     }
-    const oldLine = match[0];
-    const oldVersion = match[1];
+    const [oldLine, oldVersion] = match;
     const newLine = oldLine.replace(oldVersion, newVersion);
     const newFileContents = oldFileContents.replace(oldLine, newLine);
     writeFileSync(filePath, newFileContents);
diff --git a/scripts/validateRelease.ts b/scripts/validateRelease.ts
index b499e53..dea8c6f 100644
--- a/scripts/validateRelease.ts
+++ b/scripts/validateRelease.ts
@@ -22,8 +22,8 @@ function validateRelease(publishTag: string, dropPath: string): void {
         throw new Error('Drop path should have one tgz file');
     }
 
-    const match = files[0].match(/^azure-functions-(.*)\.tgz$/);
-    if (!match) {
+    const match = files[0]?.match(/^azure-functions-(.*)\.tgz$/);
+    if (!match || !match[1]) {
         throw new Error(`Unrecognized tgz file name "${files[0]}"`);
     }
 
diff --git a/src/InvocationModel.ts b/src/InvocationModel.ts
index 5cafda2..7dd49f1 100644
--- a/src/InvocationModel.ts
+++ b/src/InvocationModel.ts
@@ -62,7 +62,7 @@ export class InvocationModel implements coreTypes.InvocationModel {
                 const bindingName = nonNullProp(binding, 'name');
                 let input: unknown = fromRpcTypedData(binding.data);
 
-                const bindingType = this.#bindings[bindingName].type;
+                const bindingType = nonNullProp(this.#bindings, bindingName).type;
                 if (isTimerTrigger(bindingType)) {
                     input = toCamelCaseValue(input);
                 }
diff --git a/src/converters/fromRpcNullable.ts b/src/converters/fromRpcNullable.ts
index 1c53b89..613be93 100644
--- a/src/converters/fromRpcNullable.ts
+++ b/src/converters/fromRpcNullable.ts
@@ -10,7 +10,7 @@ export function fromNullableMapping(
     let converted: Record<string, string> = {};
     if (nullableMapping && Object.keys(nullableMapping).length > 0) {
         for (const key in nullableMapping) {
-            converted[key] = nullableMapping[key].value || '';
+            converted[key] = nullableMapping[key]?.value || '';
         }
     } else if (originalMapping && Object.keys(originalMapping).length > 0) {
         converted = originalMapping;
diff --git a/test/converters/toRpcHttpCookie.test.ts b/test/converters/toRpcHttpCookie.test.ts
index 3febba0..8750fd9 100644
--- a/test/converters/toRpcHttpCookie.test.ts
+++ b/test/converters/toRpcHttpCookie.test.ts
@@ -28,18 +28,18 @@ describe('toRpcHttpCookie', () => {
         ];
 
         const rpcCookies = cookieInputs.map(toRpcHttpCookie);
-        expect(rpcCookies[0].name).to.equal('mycookie');
-        expect(rpcCookies[0].value).to.equal('myvalue');
-        expect((<any>rpcCookies[0].maxAge).value).to.equal(200000);
+        expect(rpcCookies[0]?.name).to.equal('mycookie');
+        expect(rpcCookies[0]?.value).to.equal('myvalue');
+        expect((<any>rpcCookies[0]?.maxAge).value).to.equal(200000);
 
-        expect(rpcCookies[1].name).to.equal('mycookie2');
-        expect(rpcCookies[1].value).to.equal('myvalue2');
-        expect((<any>rpcCookies[1].path).value).to.equal('/');
-        expect((<any>rpcCookies[1].maxAge).value).to.equal(200000);
+        expect(rpcCookies[1]?.name).to.equal('mycookie2');
+        expect(rpcCookies[1]?.value).to.equal('myvalue2');
+        expect((<any>rpcCookies[1]?.path).value).to.equal('/');
+        expect((<any>rpcCookies[1]?.maxAge).value).to.equal(200000);
 
-        expect(rpcCookies[2].name).to.equal('mycookie3-expires');
-        expect(rpcCookies[2].value).to.equal('myvalue3-expires');
-        expect((<any>rpcCookies[2].expires).value.seconds).to.equal(819199440);
+        expect(rpcCookies[2]?.name).to.equal('mycookie3-expires');
+        expect(rpcCookies[2]?.value).to.equal('myvalue3-expires');
+        expect((<any>rpcCookies[2]?.expires).value.seconds).to.equal(819199440);
     });
 
     it('http cookie SameSite', () => {
@@ -66,17 +66,17 @@ describe('toRpcHttpCookie', () => {
         ];
 
         const rpcCookies = cookieInputs.map(toRpcHttpCookie);
-        expect(rpcCookies[0].name).to.equal('none-cookie');
-        expect(rpcCookies[0].sameSite).to.equal('explicitNone');
+        expect(rpcCookies[0]?.name).to.equal('none-cookie');
+        expect(rpcCookies[0]?.sameSite).to.equal('explicitNone');
 
-        expect(rpcCookies[1].name).to.equal('lax-cookie');
-        expect(rpcCookies[1].sameSite).to.equal('lax');
+        expect(rpcCookies[1]?.name).to.equal('lax-cookie');
+        expect(rpcCookies[1]?.sameSite).to.equal('lax');
 
-        expect(rpcCookies[2].name).to.equal('strict-cookie');
-        expect(rpcCookies[2].sameSite).to.equal('strict');
+        expect(rpcCookies[2]?.name).to.equal('strict-cookie');
+        expect(rpcCookies[2]?.sameSite).to.equal('strict');
 
-        expect(rpcCookies[3].name).to.equal('default-cookie');
-        expect(rpcCookies[3].sameSite).to.equal('none');
+        expect(rpcCookies[3]?.name).to.equal('default-cookie');
+        expect(rpcCookies[3]?.sameSite).to.equal('none');
     });
 
     it('throws on invalid input', () => {
diff --git a/test/index.ts b/test/index.ts
index e94e98b..77e8852 100644
--- a/test/index.ts
+++ b/test/index.ts
@@ -42,7 +42,7 @@ export async function run(): Promise<void> {
 function addEnvVarsToMochaOptions(options: Mocha.MochaOptions): void {
     for (const envVar of Object.keys(process.env)) {
         const match: RegExpMatchArray | null = envVar.match(/^mocha_(.+)/i);
-        if (match) {
+        if (match && match[1]) {
             const [, option] = match;
             let value: string | number = process.env[envVar] || '';
             if (typeof value === 'string' && !isNaN(parseInt(value))) {
diff --git a/tsconfig.json b/tsconfig.json
index aaecfa6..a4d6514 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
         "target": "es6",
         "strict": true,
         "noUnusedLocals": true,
+        "noUncheckedIndexedAccess": true,
         "outDir": "out",
         "sourceMap": true,
         "baseUrl": "./",