diff --git a/kork/chain.py b/kork/chain.py
index 215a839..5361955 100644
--- a/kork/chain.py
+++ b/kork/chain.py
@@ -15,15 +15,13 @@
     cast,
 )
 
-from langchain import LLMChain
 from langchain.chains.base import Chain
-from langchain.prompts import PromptTemplate
+from langchain_core.prompts import PromptTemplate
 
 try:
     from langchain.base_language import BaseLanguageModel
 except ImportError:
     from langchain.schema import BaseLanguageModel
-from pydantic import Extra
 
 from kork import ast
 from kork.ast_printer import AbstractAstPrinter, AstPrinter
@@ -128,7 +126,7 @@ class CodeChain(Chain):
     class Config:
         """Configuration for this pydantic object."""
 
-        extra = Extra.allow
+        extra = "allow"
         arbitrary_types_allowed = True
 
     @property
@@ -226,14 +224,14 @@ def _call(self, inputs: Dict[str, str]) -> CodeResult:  # type: ignore
 
         environment, few_shot_template = self.prepare_context(query, variables)
 
-        chain = LLMChain(
-            prompt=few_shot_template,
-            llm=self.llm,
-        )
+        chain = few_shot_template | self.llm
 
         formatted_query = format_text(query, self.input_formatter)
-        llm_output = cast(str, chain.predict_and_parse(query=formatted_query))
-        code = unwrap_tag("code", llm_output)
+        llm_output = chain.invoke({"query": formatted_query})
+
+        # Extract content from AIMessage
+        llm_output_content = llm_output.content
+        code = unwrap_tag("code", llm_output_content)
 
         if not code:
             return {
@@ -243,7 +241,7 @@ def _call(self, inputs: Dict[str, str]) -> CodeResult:  # type: ignore
                         "is wrapped in a code block."
                     )
                 ],
-                "raw": llm_output,
+                "raw": llm_output_content,
                 "code": "",
                 "environment": None,
             }
@@ -253,14 +251,14 @@ def _call(self, inputs: Dict[str, str]) -> CodeResult:  # type: ignore
         if interpreter_result["errors"]:
             return {
                 "errors": interpreter_result["errors"],
-                "raw": llm_output,
+                "raw": llm_output_content,
                 "code": code,
                 "environment": None,
             }
 
         return {
             "errors": [],
-            "raw": llm_output,
+            "raw": llm_output_content,
             "code": code,
             "environment": interpreter_result["environment"],
         }
diff --git a/kork/parser.py b/kork/parser.py
index 41f58d3..12801a2 100644
--- a/kork/parser.py
+++ b/kork/parser.py
@@ -17,7 +17,7 @@
 
 from kork import ast
 
-GRAMMAR = """
+GRAMMAR = r"""
     program: statement+
 
     statement: function_decl
diff --git a/kork/prompt_adapter.py b/kork/prompt_adapter.py
index 59cd1cd..94439e6 100644
--- a/kork/prompt_adapter.py
+++ b/kork/prompt_adapter.py
@@ -7,9 +7,8 @@
 """
 from typing import Any, Callable, List, Sequence, Tuple
 
-from langchain import BasePromptTemplate, PromptTemplate
 from langchain.schema import BaseMessage, HumanMessage, PromptValue, SystemMessage
-from pydantic import Extra
+from langchain_core.prompts import BasePromptTemplate, PromptTemplate
 
 
 class FewShotPromptValue(PromptValue):
@@ -21,7 +20,7 @@ class FewShotPromptValue(PromptValue):
     class Config:
         """Configuration for this pydantic object."""
 
-        extra = Extra.forbid
+        extra = "forbid"
         arbitrary_types_allowed = True
 
     def to_string(self) -> str:
diff --git a/tests/test_chain.py b/tests/test_chain.py
index c27bdf1..ef3ef0b 100644
--- a/tests/test_chain.py
+++ b/tests/test_chain.py
@@ -18,7 +18,7 @@ def test_code_chain() -> None:
         example_retriever=example_retriever,
     )
 
-    response = chain(inputs={"query": "blah"})
+    response = chain.invoke({"query": "blah"})
     # Why does the chain return a `query` key?
     assert sorted(response) == ["code", "environment", "errors", "query", "raw"]
     env = response.pop("environment")
@@ -43,7 +43,7 @@ def test_bad_program() -> None:
         example_retriever=example_retriever,
     )
 
-    response = chain(inputs={"query": "blah"})
+    response = chain.invoke({"query": "blah"})
     # Why does the chain return a `query` key?
     assert sorted(response) == ["code", "environment", "errors", "query", "raw"]
     assert response["raw"] == "<code>\nINVALID PROGRAM\n</code>"
@@ -67,7 +67,7 @@ def test_llm_output_missing_program() -> None:
         example_retriever=example_retriever,
     )
 
-    response = chain(inputs={"query": "blah"})
+    response = chain.invoke({"query": "blah"})
     # Why does the chain return a `query` key?
     assert sorted(response) == ["code", "environment", "errors", "query", "raw"]
     assert response["raw"] == "oops."
@@ -82,7 +82,7 @@ def test_from_defaults_instantiation() -> None:
     """Test from default instantiation."""
     llm = ToyChatModel(response="<code>\nvar x = 1;\n</code>")
     chain = CodeChain.from_defaults(llm=llm)
-    response = chain(inputs={"query": "blah"})
+    response = chain.invoke({"query": "blah"})
     # Why does the chain return a `query` key?
     assert sorted(response) == ["code", "environment", "errors", "query", "raw"]
     assert response["environment"].get_symbol("x") == 1
diff --git a/tests/test_prompt_adapter.py b/tests/test_prompt_adapter.py
index 35b5379..3b39e09 100644
--- a/tests/test_prompt_adapter.py
+++ b/tests/test_prompt_adapter.py
@@ -1,4 +1,4 @@
-from langchain.prompts import PromptTemplate
+from langchain_core.prompts import PromptTemplate
 
 from kork.prompt_adapter import FewShotPromptValue, FewShotTemplate
 
diff --git a/tests/utils.py b/tests/utils.py
index cce5622..41339cb 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -2,7 +2,6 @@
 
 from langchain.chat_models.base import BaseChatModel
 from langchain.schema import AIMessage, BaseMessage, ChatGeneration, ChatResult
-from pydantic import Extra
 
 
 class ToyChatModel(BaseChatModel):
@@ -11,7 +10,7 @@ class ToyChatModel(BaseChatModel):
     class Config:
         """Configuration for this pydantic object."""
 
-        extra = Extra.forbid
+        extra = "forbid"
         arbitrary_types_allowed = True
 
     def _generate(
@@ -28,3 +27,7 @@ async def _agenerate(
         message = AIMessage(content=self.response)
         generation = ChatGeneration(message=message)
         return ChatResult(generations=[generation])
+
+    @property
+    def _llm_type(self) -> str:
+        return "toy"