diff --git a/Makefile b/Makefile
index dc07094..ac1bf09 100644
--- a/Makefile
+++ b/Makefile
@@ -34,7 +34,7 @@ typecheck: venv/.done
 	venv/bin/mypy --strict phasm tests/integration/runners.py
 
 venv/.done: requirements.txt
-	python3.8 -m venv venv
+	python3.10 -m venv venv
 	venv/bin/python3 -m pip install wheel pip --upgrade
 	venv/bin/python3 -m pip install -r $^
 	touch $@
diff --git a/README.md b/README.md
index c9cb056..a5af8d8 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ This is a hobby project for now. Use at your own risk.
 
 How to run
 ----------
-You should only need make and python3. Currently, we're working with python3.8,
+You should only need make and python3. Currently, we're working with python3.10,
 since we're using the python ast parser, it might not work on other versions.
 
 To run the examples:
@@ -32,7 +32,7 @@ make lint typecheck
 
 To compile a Phasm file:
 ```sh
-python3.8 -m phasm source.py output.wat
+python3.10 -m phasm source.py output.wat
 ```
 
 Additional required tools
diff --git a/phasm/parser.py b/phasm/parser.py
index ae02172..81ddbe8 100644
--- a/phasm/parser.py
+++ b/phasm/parser.py
@@ -539,7 +539,7 @@ class OurVisitor:
         if not isinstance(node.value, ast.Name):
             _raise_static_error(node, 'Must reference a name')
 
-        if not isinstance(node.slice, ast.Index):
+        if isinstance(node.slice, ast.Slice):
             _raise_static_error(node, 'Must subscript using an index')
 
         if not isinstance(node.ctx, ast.Load):
@@ -556,7 +556,7 @@ class OurVisitor:
             _raise_static_error(node, f'Undefined variable {node.value.id}')
 
         slice_expr = self.visit_Module_FunctionDef_expr(
-            module, function, our_locals, node.slice.value,
+            module, function, our_locals, node.slice,
         )
 
         return Subscript(varref, slice_expr)
@@ -593,11 +593,11 @@ class OurVisitor:
         if isinstance(node, ast.Subscript):
             if not isinstance(node.value, ast.Name):
                 _raise_static_error(node, 'Must be name')
-            if not isinstance(node.slice, ast.Index):
+            if isinstance(node.slice, ast.Slice):
                 _raise_static_error(node, 'Must subscript using an index') # FIXME: Do we use type level length?
-            if not isinstance(node.slice.value, ast.Constant):
+            if not isinstance(node.slice, ast.Constant):
                 _raise_static_error(node, 'Must subscript using a constant index')
-            if not isinstance(node.slice.value.value, int):
+            if not isinstance(node.slice.value, int):
                 _raise_static_error(node, 'Must subscript using a constant integer index')
             if not isinstance(node.ctx, ast.Load):
                 _raise_static_error(node, 'Must be load context')
diff --git a/requirements.txt b/requirements.txt
index d29e53c..64dce30 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,10 @@
-mypy==0.812
+mypy==0.991
 pygments==2.12.0
-pylint==2.7.4
-pytest==6.2.2
+pylint==2.15.9
+pytest==7.2.0
 pytest-integration==0.2.2
 pywasm==1.0.7
 pywasm3==0.5.0
 wasmer==1.1.0
 wasmer_compiler_cranelift==1.1.0
-wasmtime==0.36.0
+wasmtime==3.0.0
diff --git a/tests/integration/runners.py b/tests/integration/runners.py
index c87942f..91a29fd 100644
--- a/tests/integration/runners.py
+++ b/tests/integration/runners.py
@@ -162,7 +162,7 @@ class RunnerPywasm3(RunnerBase):
         memory = self.rtime.get_memory(0)
 
         for idx, byt in enumerate(data):
-            memory[offset + idx] = byt # type: ignore
+            memory[offset + idx] = byt
 
     def interpreter_read_memory(self, offset: int, length: int) -> bytes:
         memory = self.rtime.get_memory(0)