diff --git a/pyproject.toml b/pyproject.toml
index 91f6e1d..175df59 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,8 +6,8 @@ readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
     "beautifulsoup4>=4.11.1",
-    "iso-language-codes>=1.1.0",
-    "langcodes>=3.5.0",
+    "iso-language-codes==1.1.0",
+    "langcodes==3.5.0",
     "lxml>=4.9.1",
     "marisa-trie>=0.7.7",
     "pinyin-jyutping-sentence>=1.3",
diff --git a/requirements.txt b/requirements.txt
index bb33205..704c249 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,5 @@ beautifulsoup4 >= 4.11.1
 pinyin >= 0.4.0
 pyglossary >= 4.6.1
 pinyin_jyutping_sentence
-langcodes
\ No newline at end of file
+langcodes==3.5.0
+iso-language-codes==1.1.0
\ No newline at end of file
diff --git a/uv.lock b/uv.lock
index dc0d6ef..362a88f 100644
--- a/uv.lock
+++ b/uv.lock
@@ -263,8 +263,8 @@ dependencies = [
 requires-dist = [
     { name = "beautifulsoup4", specifier = ">=4.11.1" },
     { name = "dragonmapper", specifier = ">=0.3.0" },
-    { name = "iso-language-codes", specifier = ">=1.1.0" },
-    { name = "langcodes", specifier = ">=3.5.0" },
+    { name = "iso-language-codes", specifier = "==1.1.0" },
+    { name = "langcodes", specifier = "==3.5.0" },
     { name = "lxml", specifier = ">=4.9.1" },
     { name = "marisa-trie", specifier = ">=0.7.7" },
     { name = "pinyin", specifier = ">=0.4.0" },