diff --git a/Project.toml b/Project.toml
index d2ba159df..90da51e47 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "Nemo"
 uuid = "2edaba10-b0f1-5616-af89-8c11ac63239a"
-version = "0.35.1"
+version = "0.35.3"
 
 [deps]
 AbstractAlgebra = "c3fe647b-3220-5bb0-a1ea-a7954cac585d"
diff --git a/src/HeckeMiscPoly.jl b/src/HeckeMiscPoly.jl
index 7cecbf2c4..695e0d256 100644
--- a/src/HeckeMiscPoly.jl
+++ b/src/HeckeMiscPoly.jl
@@ -239,7 +239,7 @@ function roots(K::FqPolyRepField, f::FpPolyRingElem)
     return roots(ff)
 end
 
-function is_power(a::Union{fqPolyRepFieldElem,FqPolyRepFieldElem,FqFieldElem}, m::Int)
+function is_power(a::Union{fpField, FpFieldElem, fqPolyRepFieldElem,FqPolyRepFieldElem,FqFieldElem}, m::Int)
     if iszero(a)
         return true, a
     end
@@ -537,6 +537,9 @@ function is_squarefree(f::PolyElem{<:FieldElement})
 end
 
 function is_squarefree(f::PolyElem{<:RingElement})
+  if iszero(f)
+    return true
+  end
   fac = factor_squarefree(f)
   return all(e <= 1 for (_, e) in fac)
 end
diff --git a/src/Nemo.jl b/src/Nemo.jl
index 995802988..e30a9ddab 100644
--- a/src/Nemo.jl
+++ b/src/Nemo.jl
@@ -107,8 +107,8 @@ end
 
 # check whether we are using flint version >= 3.0 (or some recent enough dev version),
 # which changed the layout of some structs
-_ptr = Libc.dlopen(libflint)
-if Libc.dlsym(_ptr, :_fmpz_mod_vec_set_fmpz_vec_threaded; throw_error = false) !== nothing
+_ptr = Libdl.dlopen(libflint)
+if Libdl.dlsym(_ptr, :_fmpz_mod_vec_set_fmpz_vec_threaded; throw_error = false) !== nothing
   const NEW_FLINT = true
 	libantic = libflint
 	libarb = libflint
@@ -116,7 +116,7 @@ if Libc.dlsym(_ptr, :_fmpz_mod_vec_set_fmpz_vec_threaded; throw_error = false) !
 else
   const NEW_FLINT = false
 end
-Libc.dlclose(_ptr)
+Libdl.dlclose(_ptr)
 
 ################################################################################
 #