diff --git a/Project.toml b/Project.toml
index 058e1e3a..39c78157 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Polymake"
 uuid = "d720cf60-89b5-51f5-aff5-213f193123e7"
 repo = "https://github.com/oscar-system/Polymake.jl.git"
-version = "0.11.19"
+version = "0.11.20"
 
 [deps]
 AbstractAlgebra = "c3fe647b-3220-5bb0-a1ea-a7954cac585d"
@@ -44,6 +44,6 @@ SparseArrays = "^1.6"
 TOPCOM_jll = "~0.17.8"
 julia = "^1.6"
 lib4ti2_jll = "^1.6.10"
-libpolymake_julia_jll = "~0.12.0"
+libpolymake_julia_jll = "~0.12.1"
 polymake_jll = "^400.1200.0"
-polymake_oscarnumber_jll = "~0.3.0"
+polymake_oscarnumber_jll = "~0.3.1"
diff --git a/src/oscarnumber.jl b/src/oscarnumber.jl
index 825328ad..937cb06d 100644
--- a/src/oscarnumber.jl
+++ b/src/oscarnumber.jl
@@ -26,7 +26,7 @@ Base.:/(x::OscarNumber, y::OscarNumber) = x // y
 convert(::Type{<:OscarNumber}, on::OscarNumber) = on
 
 function unwrap(on::OscarNumber)
-   if Polymake.isinf(on) != 0
+   if isinf(on)
       error("cannot unwrap OscarNumber containing infinity")
    elseif _uses_rational(on)
       return _get_rational(on)
@@ -104,18 +104,9 @@ const _on_parent_by_id = Dict{Clong, Any}()
       @cfunction(Base.:-, Ref{ArgT}, (Ref{ArgT},))
    end
 
-function _on_abs_fallback(e::ArgT)::ArgT where ArgT
-   return Base.cmp(e,0) < 0 ? -e : deepcopy(e)
-end
 @generated function _on_gen_abs(::Type{ArgT}) where ArgT
-   if hasmethod(abs, (ArgT,))
-      return quote
-         @cfunction(Base.abs, Ref{ArgT}, (Ref{ArgT},))
-      end
-   else
-      return quote
-         @cfunction(_on_abs_fallback, Ref{ArgT}, (Ref{ArgT},))
-      end
+   return quote
+      @cfunction(Base.abs, Ref{ArgT}, (Ref{ArgT},))
    end
 end