diff --git a/Project.toml b/Project.toml
index ca7c4c9..e7b994d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "IntervalMatrices"
 uuid = "5c1f47dc-42dd-5697-8aaa-4d102d140ba9"
-version = "0.9.0"
+version = "0.9.1"
 
 [deps]
 IntervalArithmetic = "d1acc4aa-44c8-5952-acd4-ba5d80a2a253"
diff --git a/src/IntervalMatrices.jl b/src/IntervalMatrices.jl
index 3c5a369..0e6e23e 100644
--- a/src/IntervalMatrices.jl
+++ b/src/IntervalMatrices.jl
@@ -16,13 +16,18 @@ else
     vIA = PkgVersion.Version(IntervalArithmetic)
 end
 if vIA >= v"0.21"
-    # IntervalArithmetic v0.21 removed convert
+    # IntervalArithmetic v0.21 removed `convert`
     Base.convert(::Type{Interval{T}}, x::Number) where {T} = interval(T(x))
     Base.convert(::Type{Interval{T}}, x::Interval{T}) where {T} = x
-    Base.convert(::Type{Interval{T}}, x::Interval) where {T} = interval(T(inf(x)), T(sup(x)))
+    function Base.convert(::Type{Interval{T1}}, x::Interval{T2}) where {T1,T2}
+        return interval(T1(inf(x)), T1(sup(x)))
+    end
 else
-    # IntervalArithmetic v0.21 requires interval, but prior versions did not offer this method
+    # COV_EXCL_START
+    # IntervalArithmetic v0.21 requires `interval`, but prior versions did not
+    # offer this method for `Complex` inputs
     IntervalArithmetic.interval(a::Complex) = complex(interval(real(a)), interval(imag(a)))
+    # COV_EXCL_STOP
 end
 if vIA >= v"0.22"
     import Base: intersect
diff --git a/src/operations/norm.jl b/src/operations/norm.jl
index cc16c57..e66dd5b 100644
--- a/src/operations/norm.jl
+++ b/src/operations/norm.jl
@@ -42,7 +42,7 @@ function _opnorm_inf(A::IntervalMatrix{T}) where {T}
         if acc > res
             res = acc
         end
-    end
+    end  # COV_EXCL_LINE
     return res
 end
 
@@ -60,7 +60,7 @@ function _opnorm_1(A::IntervalMatrix{T}) where {T}
         if acc > res
             res = acc
         end
-    end
+    end  # COV_EXCL_LINE
     return res
 end
 
diff --git a/test/constructors.jl b/test/constructors.jl
index 9c0ddce..6290761 100644
--- a/test/constructors.jl
+++ b/test/constructors.jl
@@ -1,3 +1,15 @@
+@testset "Interval conversion" begin
+    x = interval(1.0)
+
+    y = convert(Interval{Float64}, x)
+    # `===` is not applicable here because it just checks value equivalence
+    # for (immutable) `Interval`s
+    @test y == x && y isa Interval{Float64}
+
+    y = convert(Interval{Float32}, x)
+    @test y == x && y isa Interval{Float32}
+end
+
 @testset "Interval matrix construction" begin
     m1 = IntervalMatrix([interval(-1.1, 0.9) interval(-4.1, -3.9); interval(3.8, 4.2) interval(0, 0.9)])
     m2 = IntervalMatrix{Float64}(undef, 2, 2)