diff --git a/.github/workflows/integration-test.yml b/.github/workflows/integration-test.yml
index f630180f..b788a923 100644
--- a/.github/workflows/integration-test.yml
+++ b/.github/workflows/integration-test.yml
@@ -18,7 +18,7 @@ jobs:
           python-version: '3.9'
 
       - name: Install cairo-lang
-        run: pip install cairo-lang==0.11
+        run: pip install cairo-lang==0.13.1
       
       - name: Build
         run: make build
diff --git a/integration_tests/.env b/integration_tests/.env
index 8ffc5395..b24a173e 100644
--- a/integration_tests/.env
+++ b/integration_tests/.env
@@ -1,2 +1,2 @@
 # Set to run some specific file tests (ex. fib.cairo,alloc.cairo)
-INTEGRATION_TESTS_FILTERS=
+INTEGRATION_TESTS_FILTERS=is_zero.small.cairo
diff --git a/integration_tests/cairo_zero_hint_tests/is_zero.small.cairo b/integration_tests/cairo_zero_hint_tests/is_zero.small.cairo
new file mode 100644
index 00000000..c1d5e802
--- /dev/null
+++ b/integration_tests/cairo_zero_hint_tests/is_zero.small.cairo
@@ -0,0 +1,31 @@
+// Returns 1 if x == 0 (mod secp256k1_prime), and 0 otherwise.
+// Serves as integration test for the following hints : 
+// isZeroNondetCode
+// isZeroPackCode
+// isZeroDivModCode
+
+%builtins range_check
+
+from starkware.cairo.common.cairo_secp.field import is_zero, SumBigInt3
+
+func main{range_check_ptr}() -> () {
+
+    // Test One
+    let a = SumBigInt3(0, 0, 0);
+    let (res: felt) = is_zero(a);
+    assert res = 1;
+
+    // Test Two
+    let b = SumBigInt3(42, 0, 0);
+    let (res: felt) = is_zero(b);
+    assert res = 0;
+
+    // Test Three
+    let c = SumBigInt3(
+        77371252455336262886226991, 77371252455336267181195263, 19342813113834066795298815
+    );
+    let (res: felt) = is_zero(c);
+    assert res = 1;
+
+    return ();
+}
diff --git a/pkg/hintrunner/zero/hintcode.go b/pkg/hintrunner/zero/hintcode.go
index 3df68b47..45b54588 100644
--- a/pkg/hintrunner/zero/hintcode.go
+++ b/pkg/hintrunner/zero/hintcode.go
@@ -94,7 +94,7 @@ ids.multiplicities = segments.gen_arg([len(positions_dict[k]) for k in output])`
 	ecDoubleAssignNewXV1Code string = "from starkware.cairo.common.cairo_secp.secp_utils import SECP_P, pack\n\nslope = pack(ids.slope, PRIME)\nx = pack(ids.point.x, PRIME)\ny = pack(ids.point.y, PRIME)\n\nvalue = new_x = (pow(slope, 2, SECP_P) - 2 * x) % SECP_P"
 	ecDoubleAssignNewYV1Code string = "value = new_y = (slope * (x - new_x) - y) % SECP_P"
 	ecMulInnerCode           string = "memory[ap] = (ids.scalar % PRIME) % 2"
-	isZeroNondetCode         string = "x == 0"
+	isZeroNondetCode         string = "memory[ap] = to_felt_or_relocatable(x == 0)"
 	isZeroPackCode           string = "from starkware.cairo.common.cairo_secp.secp_utils import SECP_P, pack\n\nx = pack(ids.x, PRIME) % SECP_P"
 	isZeroDivModCode         string = "from starkware.cairo.common.cairo_secp.secp_utils import SECP_P\nfrom starkware.python.math_utils import div_mod\n\nvalue = x_inv = div_mod(1, x, SECP_P)"
 
diff --git a/pkg/hintrunner/zero/zerohint_ec.go b/pkg/hintrunner/zero/zerohint_ec.go
index 6d67362f..62cdfc16 100644
--- a/pkg/hintrunner/zero/zerohint_ec.go
+++ b/pkg/hintrunner/zero/zerohint_ec.go
@@ -736,9 +736,10 @@ func createEcMulInnerHinter(resolver hintReferenceResolver) (hinter.Hinter, erro
 // i.e, 1 if `x == 0`, 0 otherwise
 func newIsZeroNondetHint() hinter.Hinter {
 	return &GenericZeroHinter{
-		Name: "IsZeroConditional",
+		Name: "IsZeroNondet",
 		Op: func(vm *VM.VirtualMachine, ctx *hinter.HintRunnerContext) error {
-			//> x == 0
+			//> python hint in cairo file: "x == 0"
+			//> compiled file hint: "memory[ap] = to_felt_or_relocatable(x == 0)"
 
 			x, err := ctx.ScopeManager.GetVariableValueAsBigInt("x")
 			if err != nil {
@@ -775,6 +776,7 @@ func newIsZeroPackHint(x hinter.ResOperander) hinter.Hinter {
 		Name: "IsZeroPack",
 		Op: func(vm *VM.VirtualMachine, ctx *hinter.HintRunnerContext) error {
 			//> from starkware.cairo.common.cairo_secp.secp_utils import SECP_P, pack
+
 			//> x = pack(ids.x, PRIME) % SECP_P
 
 			xAddr, err := x.GetAddress(vm)
@@ -829,6 +831,7 @@ func newIsZeroDivModHint() hinter.Hinter {
 		Op: func(vm *VM.VirtualMachine, ctx *hinter.HintRunnerContext) error {
 			//> from starkware.cairo.common.cairo_secp.secp_utils import SECP_P
 			//> from starkware.python.math_utils import div_mod
+
 			//> value = x_inv = div_mod(1, x, SECP_P)
 
 			secPBig, ok := secp_utils.GetSecPBig()