diff --git a/.github/workflows/run_tests.yaml b/.github/workflows/run_tests.yaml
index 7c93e6d..4b437d0 100644
--- a/.github/workflows/run_tests.yaml
+++ b/.github/workflows/run_tests.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
       - uses: actions/checkout@v3
diff --git a/Dockerfile b/Dockerfile
index 1036b39..29fe75b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Dockerfile for running simeon in a container
-FROM python:3.11-slim
+FROM python:3.13.2-slim
 # Set a key-value label for the Docker image
 LABEL maintainer="MIT Institutional Research"
 LABEL email="irx@mit.edu"
diff --git a/pyproject.toml b/pyproject.toml
index 45a1b98..a488daa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,8 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Text Processing",
 ]
diff --git a/setup.py b/setup.py
index 1ba6445..01f6ab9 100644
--- a/setup.py
+++ b/setup.py
@@ -63,7 +63,9 @@
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Text Processing",
     ],
diff --git a/simeon/scripts/utilities.py b/simeon/scripts/utilities.py
index 5f905c6..941612e 100644
--- a/simeon/scripts/utilities.py
+++ b/simeon/scripts/utilities.py
@@ -436,7 +436,7 @@ def process_extra_args(extras):
 
     # If it's a file, try reading it as a JSON file
     if isinstance(extras, str) and extras.startswith("@"):
-        with open(extras) as file_handle:
+        with open(extras[1:]) as file_handle:
             return json.load(file_handle)
 
     # Otherwise, process the string