diff --git a/environment.yml b/environment.yml
index fe2edb2..79ef907 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,7 +4,7 @@ channels:
   - conda-forge
 dependencies:
   - aiohttp==3.11.*
-  - biopython==1.85
+  - biopython==1.78
   - pytest
   - pytest-asyncio
   - python-build
diff --git a/pyproject.toml b/pyproject.toml
index 798fb58..f3f315b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ dynamic = ["version"]
 readme = "README.md"
 
 dependencies = [
-    "biopython==1.85",
+    "biopython~=1.78",
     "aiohttp[speedups]==3.11.*",
 ]
 requires-python = ">=3.12"