diff --git a/Project.toml b/Project.toml
index b38dcef..63a42de 100644
--- a/Project.toml
+++ b/Project.toml
@@ -9,7 +9,7 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 
 [compat]
-DecFP_jll = "2.0.3"
+DecFP_jll = "2.0.300"
 SpecialFunctions = "0.8, 0.9, 0.10, 0.11, 1, 2"
 julia = "1.7"
 Printf = "<0.0.1, 1"
diff --git a/test/runtests.jl b/test/runtests.jl
index 29fec54..5b516d5 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -422,6 +422,15 @@ for T in (Dec32, Dec64, Dec128)
     io = IOBuffer()
     write(io, one(T))
     @test read(IOBuffer(take!(io)), T) === one(T)
+
+    # issue #176
+    @test T("1." * "0"^150, RoundUp) == T(1)
+    if T == Dec32
+        @test T("1" * "0"^50 * ".0", RoundUp) == T("1.0e50")
+    else
+        @test T("1" * "0"^150 * ".0", RoundUp) == T("1.0e150")
+    end
+    @test T("9." * "9"^(precision(T, base=10) - 1) * "0"^150 * "5", RoundUp) == T(10)
 end
 
 @test widen(Dec32) == Dec64
@@ -509,3 +518,7 @@ end
 @test DecFP._int_maxintfloat(Dec32) === UInt32(maxintfloat(Dec32))
 @test DecFP._int_maxintfloat(Dec64) === UInt64(maxintfloat(Dec64))
 @test DecFP._int_maxintfloat(Dec128) === UInt128(maxintfloat(Dec128))
+
+# issue #176
+@test Dec128(big(10)^1000, RoundUp) == Dec128("1e1000")
+@test d128"1e1000" == big(10)^1000