diff --git a/easyliftover/lifters/abstract.py b/easyliftover/lifters/abstract.py
index 29fe500..5b240c5 100644
--- a/easyliftover/lifters/abstract.py
+++ b/easyliftover/lifters/abstract.py
@@ -60,8 +60,9 @@ def lift_url(self, url: str) -> str:
         """Lifts a URL."""
         raise NotImplementedError
 
+    @staticmethod
     @abstractmethod
-    def supported_formats(self) -> list:
+    def supported_formats() -> list:
         """Returns the supported formats."""
         raise NotImplementedError
 
diff --git a/easyliftover/lifters/bed.py b/easyliftover/lifters/bed.py
index 761c64b..8e4aad7 100644
--- a/easyliftover/lifters/bed.py
+++ b/easyliftover/lifters/bed.py
@@ -25,6 +25,7 @@ def __lift_row__(self, row: str) -> "str | None":
         else:
             return None
 
-    def supported_formats(self) -> list:
+    @staticmethod
+    def supported_formats() -> list:
         """Returns the supported formats."""
         return ["bed"]
diff --git a/easyliftover/lifters/bedgraph.py b/easyliftover/lifters/bedgraph.py
index 15cdb72..fa4baf1 100644
--- a/easyliftover/lifters/bedgraph.py
+++ b/easyliftover/lifters/bedgraph.py
@@ -25,6 +25,7 @@ def __lift_row__(self, row: str) -> "str | None":
         else:
             return None
 
-    def supported_formats(self) -> list:
+    @staticmethod
+    def supported_formats() -> list:
         """Returns the supported formats."""
         return ["bedgraph", "bg"]
diff --git a/easyliftover/lifters/bigwig.py b/easyliftover/lifters/bigwig.py
index f04de67..632977d 100644
--- a/easyliftover/lifters/bigwig.py
+++ b/easyliftover/lifters/bigwig.py
@@ -47,6 +47,7 @@ def lift_bw(self, bw) -> str:
 
         return wig
 
-    def supported_formats(self) -> list:
+    @staticmethod
+    def supported_formats() -> list:
         """Returns the supported formats."""
         return ["bigwig", "bw"]
diff --git a/easyliftover/lifters/gff.py b/easyliftover/lifters/gff.py
index dd16c3f..58469f2 100644
--- a/easyliftover/lifters/gff.py
+++ b/easyliftover/lifters/gff.py
@@ -25,6 +25,7 @@ def __lift_row__(self, row: str) -> "str | None":
         else:
             return None
 
-    def supported_formats(self) -> list:
+    @staticmethod
+    def supported_formats() -> list:
         """Returns the supported formats."""
         return ["gff", "gff3", "gtf"]
diff --git a/easyliftover/lifters/vcf.py b/easyliftover/lifters/vcf.py
index 976b1d1..786007a 100644
--- a/easyliftover/lifters/vcf.py
+++ b/easyliftover/lifters/vcf.py
@@ -24,6 +24,7 @@ def __lift_row__(self, row: str) -> "str | None":
         else:
             return None
 
-    def supported_formats(self) -> list:
+    @staticmethod
+    def supported_formats() -> list:
         """Returns the supported formats."""
         return ["vcf"]
diff --git a/easyliftover/lifters/wig.py b/easyliftover/lifters/wig.py
index b478fd4..dab06b4 100644
--- a/easyliftover/lifters/wig.py
+++ b/easyliftover/lifters/wig.py
@@ -61,6 +61,7 @@ def lift_content(self, content: str) -> str:
 
         return "\n".join(result)
 
-    def supported_formats(self) -> list:
+    @staticmethod
+    def supported_formats() -> list:
         """Returns the supported formats."""
         return ["wig"]